partly or unimplemented features - now implemented
This commit is contained in:
master
@@ -0,0 +1,88 @@
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namespace StellaOps.RiskEngine.Core.Contracts;
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/// <summary>
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/// Exploit maturity level taxonomy.
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/// Ordered from least mature to most mature exploitation.
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/// </summary>
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public enum ExploitMaturityLevel
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{
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/// <summary>
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/// No known exploitation. No public exploit code, no reports.
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/// </summary>
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Unknown = 0,
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/// <summary>
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/// Theoretical exploitation. Vulnerability documented but no proof of concept.
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/// </summary>
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Theoretical = 1,
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/// <summary>
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/// Proof of concept exists. Public exploit code available but not weaponized.
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/// </summary>
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ProofOfConcept = 2,
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/// <summary>
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/// Active exploitation in the wild. Reports of exploitation but not widespread.
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/// </summary>
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Active = 3,
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/// <summary>
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/// Weaponized. Exploit kits, malware, or ransomware using this vulnerability.
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/// CISA KEV or similar authoritative source confirms active exploitation.
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/// </summary>
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Weaponized = 4
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}
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/// <summary>
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/// Evidence source for exploit maturity signal.
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/// </summary>
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public enum MaturityEvidenceSource
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{
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/// <summary>EPSS probability score.</summary>
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Epss,
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/// <summary>CISA Known Exploited Vulnerabilities catalog.</summary>
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Kev,
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/// <summary>In-the-wild exploitation report (e.g., threat intel feed).</summary>
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InTheWild,
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/// <summary>Exploit-DB or similar public exploit database.</summary>
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ExploitDb,
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/// <summary>Nuclei or other vulnerability scanner templates.</summary>
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ScannerTemplate,
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/// <summary>Internal or user-provided override.</summary>
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Override
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}
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/// <summary>
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/// Individual maturity signal from a specific source.
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/// </summary>
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public sealed record MaturitySignal(
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MaturityEvidenceSource Source,
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ExploitMaturityLevel Level,
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double Confidence,
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string? Evidence,
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DateTimeOffset? ObservedAt);
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/// <summary>
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/// Result of exploit maturity assessment.
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/// </summary>
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public sealed record ExploitMaturityResult(
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string CveId,
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ExploitMaturityLevel Level,
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double Confidence,
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IReadOnlyList<MaturitySignal> Signals,
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string Rationale,
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DateTimeOffset AssessedAt);
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/// <summary>
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/// Historical maturity state for lifecycle tracking.
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/// </summary>
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public sealed record MaturityHistoryEntry(
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ExploitMaturityLevel Level,
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double Confidence,
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DateTimeOffset Timestamp,
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string ChangeReason);
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@@ -0,0 +1,226 @@
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using Microsoft.Extensions.Logging;
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using StellaOps.RiskEngine.Core.Contracts;
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using System.Diagnostics.Metrics;
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namespace StellaOps.RiskEngine.Core.Providers;
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/// <summary>
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/// Consolidates EPSS, KEV, and in-the-wild signals into a unified exploit maturity level.
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/// Implements deterministic maturity assessment for risk prioritization.
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/// </summary>
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public sealed class ExploitMaturityService : IExploitMaturityService
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{
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private static readonly Meter Meter = new("StellaOps.RiskEngine");
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private static readonly Histogram<double> AssessmentDuration = Meter.CreateHistogram<double>(
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"stellaops_exploit_maturity_assessment_duration_ms",
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unit: "ms",
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description: "Time to assess exploit maturity");
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private static readonly Counter<long> AssessmentCount = Meter.CreateCounter<long>(
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"stellaops_exploit_maturity_assessments_total",
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unit: "assessments",
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description: "Total exploit maturity assessments");
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/// <summary>
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/// EPSS thresholds for maturity level mapping.
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/// Based on EPSS percentile/probability research.
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/// </summary>
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public static readonly IReadOnlyList<(double Score, ExploitMaturityLevel Level)> EpssThresholds =
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[
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(0.80, ExploitMaturityLevel.Weaponized), // Very high exploitation probability
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(0.40, ExploitMaturityLevel.Active), // High exploitation probability
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(0.10, ExploitMaturityLevel.ProofOfConcept), // Moderate exploitation probability
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(0.01, ExploitMaturityLevel.Theoretical), // Low exploitation probability
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];
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private readonly IEpssSource _epss;
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private readonly IKevSource _kev;
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private readonly IInTheWildSource? _inTheWild;
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private readonly ILogger<ExploitMaturityService> _logger;
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private readonly TimeProvider _timeProvider;
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public ExploitMaturityService(
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IEpssSource epss,
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IKevSource kev,
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IInTheWildSource? inTheWild = null,
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ILogger<ExploitMaturityService>? logger = null,
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TimeProvider? timeProvider = null)
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{
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_epss = epss ?? throw new ArgumentNullException(nameof(epss));
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_kev = kev ?? throw new ArgumentNullException(nameof(kev));
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_inTheWild = inTheWild;
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_logger = logger ?? Microsoft.Extensions.Logging.Abstractions.NullLogger<ExploitMaturityService>.Instance;
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_timeProvider = timeProvider ?? TimeProvider.System;
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}
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/// <inheritdoc />
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public async Task<ExploitMaturityResult> AssessMaturityAsync(string cveId, CancellationToken cancellationToken = default)
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{
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ArgumentException.ThrowIfNullOrWhiteSpace(cveId);
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var startTime = _timeProvider.GetTimestamp();
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var signals = new List<MaturitySignal>();
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var now = _timeProvider.GetUtcNow();
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try
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{
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// Fetch all signals in parallel
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var epssTask = _epss.GetEpssAsync(cveId, cancellationToken);
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var kevTask = _kev.IsKevAsync(cveId, cancellationToken);
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var inTheWildTask = _inTheWild?.IsExploitedInTheWildAsync(cveId, cancellationToken)
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?? Task.FromResult<InTheWildResult?>(null);
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await Task.WhenAll(epssTask, kevTask, inTheWildTask).ConfigureAwait(false);
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// Process EPSS signal
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var epssData = epssTask.Result;
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if (epssData is not null)
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{
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var epssLevel = MapEpssToMaturityLevel(epssData.Score);
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signals.Add(new MaturitySignal(
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Source: MaturityEvidenceSource.Epss,
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Level: epssLevel,
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Confidence: ComputeEpssConfidence(epssData.Score, epssData.Percentile),
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Evidence: $"EPSS score: {epssData.Score:F4}, percentile: {epssData.Percentile:P1}",
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ObservedAt: now));
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}
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// Process KEV signal
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var isKev = kevTask.Result ?? false;
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if (isKev)
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{
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signals.Add(new MaturitySignal(
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Source: MaturityEvidenceSource.Kev,
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Level: ExploitMaturityLevel.Weaponized,
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Confidence: 0.95, // KEV is authoritative
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Evidence: "Listed in CISA Known Exploited Vulnerabilities catalog",
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ObservedAt: now));
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}
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// Process in-the-wild signal
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var inTheWildData = inTheWildTask.Result;
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if (inTheWildData?.IsExploited == true)
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{
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signals.Add(new MaturitySignal(
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Source: MaturityEvidenceSource.InTheWild,
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Level: ExploitMaturityLevel.Active,
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Confidence: inTheWildData.Confidence,
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Evidence: inTheWildData.Evidence,
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ObservedAt: inTheWildData.ObservedAt ?? now));
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}
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// Compute final maturity level
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var (level, confidence, rationale) = ComputeFinalMaturity(signals);
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// Record metrics
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var duration = _timeProvider.GetElapsedTime(startTime).TotalMilliseconds;
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AssessmentDuration.Record(duration, new KeyValuePair<string, object?>("cve", cveId));
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AssessmentCount.Add(1, new KeyValuePair<string, object?>("level", level.ToString()));
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_logger.LogDebug(
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"Assessed exploit maturity for {CveId}: {Level} (confidence={Confidence:F2})",
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cveId, level, confidence);
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return new ExploitMaturityResult(
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CveId: cveId,
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Level: level,
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Confidence: confidence,
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Signals: signals,
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Rationale: rationale,
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AssessedAt: now);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Failed to assess exploit maturity for {CveId}", cveId);
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throw;
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}
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}
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/// <inheritdoc />
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public Task<ExploitMaturityLevel?> GetMaturityLevelAsync(string cveId, CancellationToken cancellationToken = default)
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{
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// For now, always compute fresh. A production implementation would cache results.
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return AssessMaturityAsync(cveId, cancellationToken)
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.ContinueWith(t => (ExploitMaturityLevel?)t.Result.Level, TaskContinuationOptions.OnlyOnRanToCompletion);
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}
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/// <inheritdoc />
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public Task<IReadOnlyList<MaturityHistoryEntry>> GetMaturityHistoryAsync(string cveId, CancellationToken cancellationToken = default)
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{
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// History tracking requires persistence; return empty for now.
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// A production implementation would store and retrieve historical entries.
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return Task.FromResult<IReadOnlyList<MaturityHistoryEntry>>(Array.Empty<MaturityHistoryEntry>());
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}
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/// <summary>
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/// Maps EPSS score to a maturity level.
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/// </summary>
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private static ExploitMaturityLevel MapEpssToMaturityLevel(double epssScore)
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{
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foreach (var (threshold, level) in EpssThresholds)
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{
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if (epssScore >= threshold)
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return level;
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}
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return ExploitMaturityLevel.Unknown;
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}
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/// <summary>
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/// Computes confidence based on EPSS score and percentile.
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/// Higher percentile = higher confidence in the signal.
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/// </summary>
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private static double ComputeEpssConfidence(double score, double percentile)
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{
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// Confidence based on percentile (more extreme = more confident)
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// Percentile 0.99 -> confidence 0.9
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// Percentile 0.50 -> confidence 0.5
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// Percentile 0.10 -> confidence 0.4
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var baseConfidence = percentile >= 0.90 ? 0.9
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: percentile >= 0.50 ? 0.6 + (percentile - 0.50) * 0.75
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: 0.4 + percentile * 0.2;
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return Math.Clamp(baseConfidence, 0.0, 1.0);
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}
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/// <summary>
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/// Computes final maturity level from all signals using max-level with weighted confidence.
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/// </summary>
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private static (ExploitMaturityLevel Level, double Confidence, string Rationale) ComputeFinalMaturity(
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IReadOnlyList<MaturitySignal> signals)
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{
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if (signals.Count == 0)
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{
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return (ExploitMaturityLevel.Unknown, 0.0, "No exploit maturity signals available");
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}
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// Take the highest maturity level across all signals
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var maxLevel = signals.Max(s => s.Level);
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var maxLevelSignals = signals.Where(s => s.Level == maxLevel).ToList();
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// Weighted average confidence for signals at max level
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var totalConfidence = maxLevelSignals.Sum(s => s.Confidence);
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var avgConfidence = totalConfidence / maxLevelSignals.Count;
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// Build rationale
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var sources = string.Join(", ", maxLevelSignals.Select(s => s.Source.ToString()));
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var rationale = $"Maturity level {maxLevel} determined by {sources} ({maxLevelSignals.Count} signal(s))";
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return (maxLevel, avgConfidence, rationale);
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}
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}
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/// <summary>
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/// Interface for in-the-wild exploitation data source.
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/// </summary>
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public interface IInTheWildSource
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{
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Task<InTheWildResult?> IsExploitedInTheWildAsync(string cveId, CancellationToken cancellationToken = default);
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}
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/// <summary>
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/// Result from in-the-wild exploitation check.
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/// </summary>
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public sealed record InTheWildResult(
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bool IsExploited,
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double Confidence,
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string? Evidence,
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DateTimeOffset? ObservedAt);
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@@ -0,0 +1,33 @@
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using StellaOps.RiskEngine.Core.Contracts;
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namespace StellaOps.RiskEngine.Core.Providers;
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/// <summary>
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/// Interface for exploit maturity mapping service.
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/// </summary>
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public interface IExploitMaturityService
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{
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/// <summary>
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/// Assesses exploit maturity for a CVE by consolidating all available signals.
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/// </summary>
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/// <param name="cveId">CVE identifier.</param>
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/// <param name="cancellationToken">Cancellation token.</param>
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/// <returns>Exploit maturity assessment result.</returns>
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Task<ExploitMaturityResult> AssessMaturityAsync(string cveId, CancellationToken cancellationToken = default);
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/// <summary>
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/// Gets the current maturity level for a CVE.
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/// </summary>
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/// <param name="cveId">CVE identifier.</param>
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/// <param name="cancellationToken">Cancellation token.</param>
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/// <returns>Current maturity level or null if not assessed.</returns>
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Task<ExploitMaturityLevel?> GetMaturityLevelAsync(string cveId, CancellationToken cancellationToken = default);
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/// <summary>
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/// Gets maturity lifecycle history for a CVE.
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/// </summary>
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/// <param name="cveId">CVE identifier.</param>
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/// <param name="cancellationToken">Cancellation token.</param>
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/// <returns>History of maturity changes.</returns>
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Task<IReadOnlyList<MaturityHistoryEntry>> GetMaturityHistoryAsync(string cveId, CancellationToken cancellationToken = default);
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}
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@@ -0,0 +1,201 @@
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using FluentAssertions;
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using Microsoft.AspNetCore.Mvc.Testing;
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using Microsoft.Extensions.DependencyInjection;
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using StellaOps.RiskEngine.Core.Contracts;
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using StellaOps.RiskEngine.Core.Providers;
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using System.Net;
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using System.Net.Http.Json;
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using System.Text.Json;
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namespace StellaOps.RiskEngine.Tests;
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/// <summary>
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/// API contract tests for exploit maturity endpoints.
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/// </summary>
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public sealed class ExploitMaturityApiTests : IClassFixture<WebApplicationFactory<Program>>
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{
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private readonly WebApplicationFactory<Program> _factory;
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private readonly JsonSerializerOptions _jsonOptions = new() { PropertyNameCaseInsensitive = true };
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public ExploitMaturityApiTests(WebApplicationFactory<Program> factory)
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{
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// Configure test services
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_factory = factory.WithWebHostBuilder(builder =>
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{
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builder.ConfigureServices(services =>
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{
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// Replace with test sources
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services.AddSingleton<IEpssSource>(new InMemoryEpssSource(new Dictionary<string, EpssData>
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{
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["CVE-2024-1234"] = new EpssData(0.85, 0.98),
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["CVE-2024-5678"] = new EpssData(0.15, 0.55)
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}));
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});
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});
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}
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#region GET /exploit-maturity/{cveId}
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[Fact]
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public async Task GetExploitMaturity_ValidCve_ReturnsResult()
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{
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// Arrange
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var client = _factory.CreateClient();
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// Act
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var response = await client.GetAsync("/exploit-maturity/CVE-2024-1234");
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// Assert
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response.StatusCode.Should().Be(HttpStatusCode.OK);
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var result = await response.Content.ReadFromJsonAsync<ExploitMaturityResult>(_jsonOptions);
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result.Should().NotBeNull();
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result!.CveId.Should().Be("CVE-2024-1234");
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result.Level.Should().Be(ExploitMaturityLevel.Weaponized);
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}
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[Fact]
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public async Task GetExploitMaturity_UnknownCve_ReturnsUnknownLevel()
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{
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// Arrange
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var client = _factory.CreateClient();
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// Act
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var response = await client.GetAsync("/exploit-maturity/CVE-2099-9999");
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// Assert
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response.StatusCode.Should().Be(HttpStatusCode.OK);
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var result = await response.Content.ReadFromJsonAsync<ExploitMaturityResult>(_jsonOptions);
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result.Should().NotBeNull();
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result!.CveId.Should().Be("CVE-2099-9999");
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result.Level.Should().Be(ExploitMaturityLevel.Unknown);
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}
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[Fact]
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public async Task GetExploitMaturity_EmptyCveId_ReturnsBadRequest()
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{
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// Arrange
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var client = _factory.CreateClient();
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// Act
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var response = await client.GetAsync("/exploit-maturity/%20");
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// Assert
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response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
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}
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#endregion
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#region GET /exploit-maturity/{cveId}/level
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[Fact]
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public async Task GetExploitMaturityLevel_ValidCve_ReturnsLevel()
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{
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// Arrange
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var client = _factory.CreateClient();
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// Act
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var response = await client.GetAsync("/exploit-maturity/CVE-2024-5678/level");
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// Assert
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response.StatusCode.Should().Be(HttpStatusCode.OK);
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var content = await response.Content.ReadAsStringAsync();
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content.Should().Contain("level");
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}
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#endregion
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#region GET /exploit-maturity/{cveId}/history
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[Fact]
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public async Task GetExploitMaturityHistory_ReturnsEmptyList()
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{
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// Arrange (history not persisted in base implementation)
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var client = _factory.CreateClient();
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// Act
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var response = await client.GetAsync("/exploit-maturity/CVE-2024-1234/history");
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// Assert
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response.StatusCode.Should().Be(HttpStatusCode.OK);
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var content = await response.Content.ReadAsStringAsync();
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content.Should().Contain("entries");
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||||
}
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#endregion
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#region POST /exploit-maturity/batch
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[Fact]
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public async Task BatchAssessMaturity_ValidRequest_ReturnsResults()
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{
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||||
// Arrange
|
||||
var client = _factory.CreateClient();
|
||||
var request = new { CveIds = new[] { "CVE-2024-1234", "CVE-2024-5678" } };
|
||||
|
||||
// Act
|
||||
var response = await client.PostAsJsonAsync("/exploit-maturity/batch", request);
|
||||
|
||||
// Assert
|
||||
response.StatusCode.Should().Be(HttpStatusCode.OK);
|
||||
var content = await response.Content.ReadAsStringAsync();
|
||||
content.Should().Contain("results");
|
||||
content.Should().Contain("CVE-2024-1234");
|
||||
content.Should().Contain("CVE-2024-5678");
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task BatchAssessMaturity_EmptyList_ReturnsBadRequest()
|
||||
{
|
||||
// Arrange
|
||||
var client = _factory.CreateClient();
|
||||
var request = new { CveIds = Array.Empty<string>() };
|
||||
|
||||
// Act
|
||||
var response = await client.PostAsJsonAsync("/exploit-maturity/batch", request);
|
||||
|
||||
// Assert
|
||||
response.StatusCode.Should().Be(HttpStatusCode.BadRequest);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task BatchAssessMaturity_DeduplicatesCves()
|
||||
{
|
||||
// Arrange
|
||||
var client = _factory.CreateClient();
|
||||
var request = new { CveIds = new[] { "CVE-2024-1234", "CVE-2024-1234", "CVE-2024-1234" } };
|
||||
|
||||
// Act
|
||||
var response = await client.PostAsJsonAsync("/exploit-maturity/batch", request);
|
||||
|
||||
// Assert
|
||||
response.StatusCode.Should().Be(HttpStatusCode.OK);
|
||||
var content = await response.Content.ReadAsStringAsync();
|
||||
// Count occurrences - should have single result
|
||||
var occurrences = content.Split("CVE-2024-1234").Length - 1;
|
||||
occurrences.Should().BeGreaterOrEqualTo(1);
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Response Contract Tests
|
||||
|
||||
[Fact]
|
||||
public async Task GetExploitMaturity_ResponseIncludesAllFields()
|
||||
{
|
||||
// Arrange
|
||||
var client = _factory.CreateClient();
|
||||
|
||||
// Act
|
||||
var response = await client.GetAsync("/exploit-maturity/CVE-2024-1234");
|
||||
var content = await response.Content.ReadAsStringAsync();
|
||||
|
||||
// Assert: All required fields present
|
||||
content.Should().Contain("cveId");
|
||||
content.Should().Contain("level");
|
||||
content.Should().Contain("confidence");
|
||||
content.Should().Contain("signals");
|
||||
content.Should().Contain("assessedAt");
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
@@ -0,0 +1,317 @@
|
||||
using FluentAssertions;
|
||||
using StellaOps.RiskEngine.Core.Contracts;
|
||||
using StellaOps.RiskEngine.Core.Providers;
|
||||
using Microsoft.Extensions.Time.Testing;
|
||||
|
||||
namespace StellaOps.RiskEngine.Tests;
|
||||
|
||||
/// <summary>
|
||||
/// Unit tests for ExploitMaturityService.
|
||||
/// Verifies EPSS/KEV/InTheWild signal aggregation to maturity levels.
|
||||
/// </summary>
|
||||
public sealed class ExploitMaturityServiceTests
|
||||
{
|
||||
private readonly FakeTimeProvider _timeProvider = new(new DateTimeOffset(2026, 1, 15, 12, 0, 0, TimeSpan.Zero));
|
||||
|
||||
#region Test Infrastructure
|
||||
|
||||
private sealed class TestEpssSource : IEpssSource
|
||||
{
|
||||
private readonly Dictionary<string, EpssData> _data = new(StringComparer.OrdinalIgnoreCase);
|
||||
|
||||
public void SetEpss(string cveId, double score, double percentile) =>
|
||||
_data[cveId] = new EpssData(score, percentile);
|
||||
|
||||
public Task<EpssData?> GetEpssAsync(string cveId, CancellationToken cancellationToken)
|
||||
{
|
||||
_data.TryGetValue(cveId, out var result);
|
||||
return Task.FromResult(result);
|
||||
}
|
||||
}
|
||||
|
||||
private sealed class TestKevSource : IKevSource
|
||||
{
|
||||
private readonly HashSet<string> _kevIds = new(StringComparer.OrdinalIgnoreCase);
|
||||
|
||||
public void MarkKev(string cveId) => _kevIds.Add(cveId);
|
||||
|
||||
public Task<bool?> IsKevAsync(string subject, CancellationToken cancellationToken) =>
|
||||
Task.FromResult<bool?>(_kevIds.Contains(subject));
|
||||
}
|
||||
|
||||
private sealed class TestInTheWildSource : IInTheWildSource
|
||||
{
|
||||
private readonly Dictionary<string, InTheWildResult> _data = new(StringComparer.OrdinalIgnoreCase);
|
||||
|
||||
public void SetExploited(string cveId, double confidence, string? evidence = null, DateTimeOffset? observedAt = null) =>
|
||||
_data[cveId] = new InTheWildResult(true, confidence, evidence ?? "Observed in the wild", observedAt);
|
||||
|
||||
public Task<InTheWildResult?> IsExploitedInTheWildAsync(string cveId, CancellationToken cancellationToken)
|
||||
{
|
||||
_data.TryGetValue(cveId, out var result);
|
||||
return Task.FromResult(result);
|
||||
}
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Basic Signal Mapping Tests
|
||||
|
||||
[Fact]
|
||||
public async Task NoSignals_ReturnsUnknown()
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
var kev = new TestKevSource();
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Unknown);
|
||||
result.Confidence.Should().Be(0.0);
|
||||
result.Signals.Should().BeEmpty();
|
||||
}
|
||||
|
||||
[Theory]
|
||||
[InlineData(0.005, ExploitMaturityLevel.Unknown)] // Below threshold
|
||||
[InlineData(0.01, ExploitMaturityLevel.Theoretical)] // Threshold boundary
|
||||
[InlineData(0.05, ExploitMaturityLevel.Theoretical)] // Within band
|
||||
[InlineData(0.10, ExploitMaturityLevel.ProofOfConcept)] // Threshold boundary
|
||||
[InlineData(0.25, ExploitMaturityLevel.ProofOfConcept)] // Within band
|
||||
[InlineData(0.40, ExploitMaturityLevel.Active)] // Threshold boundary
|
||||
[InlineData(0.60, ExploitMaturityLevel.Active)] // Within band
|
||||
[InlineData(0.80, ExploitMaturityLevel.Weaponized)] // Threshold boundary
|
||||
[InlineData(0.95, ExploitMaturityLevel.Weaponized)] // High score
|
||||
public async Task EpssOnly_MapsToCorrectLevel(double epssScore, ExploitMaturityLevel expectedLevel)
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", epssScore, 0.50);
|
||||
var kev = new TestKevSource();
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(expectedLevel);
|
||||
if (expectedLevel != ExploitMaturityLevel.Unknown)
|
||||
{
|
||||
result.Signals.Should().ContainSingle()
|
||||
.Which.Source.Should().Be(MaturityEvidenceSource.Epss);
|
||||
}
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task KevOnly_ReturnsWeaponized()
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
var kev = new TestKevSource();
|
||||
kev.MarkKev("CVE-2024-0001");
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Weaponized);
|
||||
result.Confidence.Should().Be(0.95);
|
||||
result.Signals.Should().ContainSingle()
|
||||
.Which.Source.Should().Be(MaturityEvidenceSource.Kev);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task InTheWildOnly_ReturnsActive()
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
var kev = new TestKevSource();
|
||||
var inTheWild = new TestInTheWildSource();
|
||||
inTheWild.SetExploited("CVE-2024-0001", 0.85, "Observed by threat intel feeds");
|
||||
var sut = new ExploitMaturityService(epss, kev, inTheWild, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Active);
|
||||
result.Confidence.Should().Be(0.85);
|
||||
result.Signals.Should().ContainSingle()
|
||||
.Which.Source.Should().Be(MaturityEvidenceSource.InTheWild);
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Signal Aggregation Tests
|
||||
|
||||
[Fact]
|
||||
public async Task KevAndEpss_TakesHigherLevel()
|
||||
{
|
||||
// Arrange: EPSS suggests ProofOfConcept, KEV suggests Weaponized
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.15, 0.75);
|
||||
var kev = new TestKevSource();
|
||||
kev.MarkKev("CVE-2024-0001");
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Weaponized);
|
||||
result.Signals.Should().HaveCount(2);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task AllSignalsAgree_AveragesConfidence()
|
||||
{
|
||||
// Arrange: All signals indicate Weaponized
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.85, 0.99);
|
||||
var kev = new TestKevSource();
|
||||
kev.MarkKev("CVE-2024-0001");
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Weaponized);
|
||||
result.Signals.Should().HaveCount(2);
|
||||
// Both KEV (0.95) and EPSS (high conf) contribute
|
||||
result.Confidence.Should().BeGreaterThan(0.8);
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task MixedLevels_TakesMaxLevel()
|
||||
{
|
||||
// Arrange: InTheWild=Active, EPSS=Theoretical
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.02, 0.30);
|
||||
var kev = new TestKevSource();
|
||||
var inTheWild = new TestInTheWildSource();
|
||||
inTheWild.SetExploited("CVE-2024-0001", 0.70);
|
||||
var sut = new ExploitMaturityService(epss, kev, inTheWild, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Level.Should().Be(ExploitMaturityLevel.Active);
|
||||
result.Signals.Should().HaveCount(2);
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region EPSS Confidence Tests
|
||||
|
||||
[Theory]
|
||||
[InlineData(0.99, 0.9)] // High percentile = high confidence
|
||||
[InlineData(0.90, 0.9)] // 90th percentile = high confidence
|
||||
[InlineData(0.50, 0.6)] // 50th percentile = base
|
||||
[InlineData(0.10, 0.42)] // Low percentile = lower confidence
|
||||
public async Task EpssConfidence_ScalesWithPercentile(double percentile, double expectedMinConfidence)
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.50, percentile);
|
||||
var kev = new TestKevSource();
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Signals.Single().Confidence.Should().BeGreaterThanOrEqualTo(expectedMinConfidence);
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Error Handling
|
||||
|
||||
[Fact]
|
||||
public async Task NullCveId_ThrowsArgumentException()
|
||||
{
|
||||
// Arrange
|
||||
var sut = new ExploitMaturityService(new TestEpssSource(), new TestKevSource(), null, null, _timeProvider);
|
||||
|
||||
// Act & Assert
|
||||
await Assert.ThrowsAsync<ArgumentException>(() => sut.AssessMaturityAsync(null!));
|
||||
}
|
||||
|
||||
[Fact]
|
||||
public async Task EmptyCveId_ThrowsArgumentException()
|
||||
{
|
||||
// Arrange
|
||||
var sut = new ExploitMaturityService(new TestEpssSource(), new TestKevSource(), null, null, _timeProvider);
|
||||
|
||||
// Act & Assert
|
||||
await Assert.ThrowsAsync<ArgumentException>(() => sut.AssessMaturityAsync(""));
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region GetMaturityLevelAsync Tests
|
||||
|
||||
[Fact]
|
||||
public async Task GetMaturityLevelAsync_ReturnsLevel()
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.50, 0.80);
|
||||
var kev = new TestKevSource();
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.GetMaturityLevelAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Should().Be(ExploitMaturityLevel.Active);
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region GetMaturityHistoryAsync Tests
|
||||
|
||||
[Fact]
|
||||
public async Task GetMaturityHistoryAsync_ReturnsEmpty()
|
||||
{
|
||||
// Arrange (history not implemented yet)
|
||||
var sut = new ExploitMaturityService(new TestEpssSource(), new TestKevSource(), null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result = await sut.GetMaturityHistoryAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result.Should().BeEmpty();
|
||||
}
|
||||
|
||||
#endregion
|
||||
|
||||
#region Determinism Tests
|
||||
|
||||
[Fact]
|
||||
public async Task SameInputs_ProducesSameOutputs()
|
||||
{
|
||||
// Arrange
|
||||
var epss = new TestEpssSource();
|
||||
epss.SetEpss("CVE-2024-0001", 0.35, 0.70);
|
||||
var kev = new TestKevSource();
|
||||
kev.MarkKev("CVE-2024-0001");
|
||||
var sut = new ExploitMaturityService(epss, kev, null, null, _timeProvider);
|
||||
|
||||
// Act
|
||||
var result1 = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
var result2 = await sut.AssessMaturityAsync("CVE-2024-0001");
|
||||
|
||||
// Assert
|
||||
result1.Level.Should().Be(result2.Level);
|
||||
result1.Confidence.Should().Be(result2.Confidence);
|
||||
result1.Signals.Count.Should().Be(result2.Signals.Count);
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
@@ -0,0 +1,133 @@
|
||||
using Microsoft.AspNetCore.Builder;
|
||||
using Microsoft.AspNetCore.Http;
|
||||
using Microsoft.AspNetCore.Mvc;
|
||||
using Microsoft.AspNetCore.Routing;
|
||||
using StellaOps.RiskEngine.Core.Contracts;
|
||||
using StellaOps.RiskEngine.Core.Providers;
|
||||
|
||||
namespace StellaOps.RiskEngine.WebService.Endpoints;
|
||||
|
||||
/// <summary>
|
||||
/// Minimal API endpoints for exploit maturity assessment.
|
||||
/// </summary>
|
||||
public static class ExploitMaturityEndpoints
|
||||
{
|
||||
/// <summary>
|
||||
/// Maps exploit maturity endpoints to the application.
|
||||
/// </summary>
|
||||
public static IEndpointRouteBuilder MapExploitMaturityEndpoints(this IEndpointRouteBuilder app)
|
||||
{
|
||||
var group = app.MapGroup("/exploit-maturity")
|
||||
.WithTags("ExploitMaturity")
|
||||
.WithOpenApi();
|
||||
|
||||
// GET /exploit-maturity/{cveId} - Assess exploit maturity for a CVE
|
||||
group.MapGet("/{cveId}", async (
|
||||
string cveId,
|
||||
[FromServices] IExploitMaturityService service,
|
||||
CancellationToken ct) =>
|
||||
{
|
||||
try
|
||||
{
|
||||
var result = await service.AssessMaturityAsync(cveId, ct).ConfigureAwait(false);
|
||||
return Results.Ok(result);
|
||||
}
|
||||
catch (ArgumentException ex)
|
||||
{
|
||||
return Results.BadRequest(new { error = ex.Message });
|
||||
}
|
||||
})
|
||||
.WithName("GetExploitMaturity")
|
||||
.WithSummary("Assess exploit maturity for a CVE")
|
||||
.WithDescription("Returns unified maturity level based on EPSS, KEV, and in-the-wild signals.")
|
||||
.Produces<ExploitMaturityResult>()
|
||||
.ProducesProblem(400);
|
||||
|
||||
// GET /exploit-maturity/{cveId}/level - Get just the maturity level
|
||||
group.MapGet("/{cveId}/level", async (
|
||||
string cveId,
|
||||
[FromServices] IExploitMaturityService service,
|
||||
CancellationToken ct) =>
|
||||
{
|
||||
try
|
||||
{
|
||||
var level = await service.GetMaturityLevelAsync(cveId, ct).ConfigureAwait(false);
|
||||
return level.HasValue
|
||||
? Results.Ok(new { cveId, level = level.Value.ToString() })
|
||||
: Results.NotFound(new { cveId, error = "Maturity level could not be determined" });
|
||||
}
|
||||
catch (ArgumentException ex)
|
||||
{
|
||||
return Results.BadRequest(new { error = ex.Message });
|
||||
}
|
||||
})
|
||||
.WithName("GetExploitMaturityLevel")
|
||||
.WithSummary("Get exploit maturity level for a CVE")
|
||||
.WithDescription("Returns the maturity level without full signal details.");
|
||||
|
||||
// GET /exploit-maturity/{cveId}/history - Get maturity history
|
||||
group.MapGet("/{cveId}/history", async (
|
||||
string cveId,
|
||||
[FromServices] IExploitMaturityService service,
|
||||
CancellationToken ct) =>
|
||||
{
|
||||
try
|
||||
{
|
||||
var history = await service.GetMaturityHistoryAsync(cveId, ct).ConfigureAwait(false);
|
||||
return Results.Ok(new { cveId, entries = history });
|
||||
}
|
||||
catch (ArgumentException ex)
|
||||
{
|
||||
return Results.BadRequest(new { error = ex.Message });
|
||||
}
|
||||
})
|
||||
.WithName("GetExploitMaturityHistory")
|
||||
.WithSummary("Get exploit maturity history for a CVE")
|
||||
.WithDescription("Returns historical maturity level changes for a CVE.");
|
||||
|
||||
// POST /exploit-maturity/batch - Batch assess multiple CVEs
|
||||
group.MapPost("/batch", async (
|
||||
BatchMaturityRequest request,
|
||||
[FromServices] IExploitMaturityService service,
|
||||
CancellationToken ct) =>
|
||||
{
|
||||
if (request.CveIds is null || request.CveIds.Count == 0)
|
||||
{
|
||||
return Results.BadRequest(new { error = "CveIds list is required" });
|
||||
}
|
||||
|
||||
var results = new List<ExploitMaturityResult>();
|
||||
var errors = new List<BatchError>();
|
||||
|
||||
foreach (var cveId in request.CveIds.Distinct())
|
||||
{
|
||||
try
|
||||
{
|
||||
var result = await service.AssessMaturityAsync(cveId, ct).ConfigureAwait(false);
|
||||
results.Add(result);
|
||||
}
|
||||
catch (ArgumentException ex)
|
||||
{
|
||||
errors.Add(new BatchError(cveId, ex.Message));
|
||||
}
|
||||
}
|
||||
|
||||
return Results.Ok(new { results, errors });
|
||||
})
|
||||
.WithName("BatchAssessExploitMaturity")
|
||||
.WithSummary("Batch assess exploit maturity for multiple CVEs")
|
||||
.WithDescription("Returns maturity assessments for all requested CVEs.");
|
||||
|
||||
return app;
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Request for batch maturity assessment.
|
||||
/// </summary>
|
||||
public sealed record BatchMaturityRequest(IReadOnlyList<string>? CveIds);
|
||||
|
||||
/// <summary>
|
||||
/// Error entry in batch response.
|
||||
/// </summary>
|
||||
public sealed record BatchError(string CveId, string Error);
|
||||
@@ -5,6 +5,7 @@ using StellaOps.RiskEngine.Core.Contracts;
|
||||
using StellaOps.RiskEngine.Core.Providers;
|
||||
using StellaOps.RiskEngine.Core.Services;
|
||||
using StellaOps.RiskEngine.Infrastructure.Stores;
|
||||
using StellaOps.RiskEngine.WebService.Endpoints;
|
||||
using StellaOps.Router.AspNet;
|
||||
using System.Linq;
|
||||
|
||||
@@ -23,6 +24,11 @@ builder.Services.AddSingleton<IRiskScoreProviderRegistry>(_ =>
|
||||
new FixExposureProvider()
|
||||
}));
|
||||
|
||||
// Exploit Maturity Service registration
|
||||
builder.Services.AddSingleton<IEpssSource, NullEpssSource>();
|
||||
builder.Services.AddSingleton<IKevSource, NullKevSource>();
|
||||
builder.Services.AddSingleton<IExploitMaturityService, ExploitMaturityService>();
|
||||
|
||||
// Stella Router integration
|
||||
var routerOptions = builder.Configuration.GetSection("RiskEngine:Router").Get<StellaRouterOptionsBase>();
|
||||
builder.Services.TryAddStellaRouter(
|
||||
@@ -45,6 +51,9 @@ app.UseStellaOpsCors();
|
||||
app.UseHttpsRedirection();
|
||||
app.TryUseStellaRouter(routerOptions);
|
||||
|
||||
// Map exploit maturity endpoints
|
||||
app.MapExploitMaturityEndpoints();
|
||||
|
||||
app.MapGet("/risk-scores/providers", (IRiskScoreProviderRegistry registry) =>
|
||||
Results.Ok(new { providers = registry.ProviderNames.OrderBy(n => n, StringComparer.OrdinalIgnoreCase) }));
|
||||
|
||||
|
||||
Reference in New Issue
Block a user