CVE-2025-68702

# CVE-2025-68702 PoC - Jervis SHA-256 Padding Vulnerability # This PoC demonstrates the incorrect padLeft(32, '0') usage require 'jervis' # Vulnerable code pattern (found in Jervis < 2.2) def vulnerable_hash_processing(input) sha256_hash = Digest::SHA256.hexdigest(input) # BUG: Should be padLeft(64, '0') for SHA-256 (32 bytes = 64 hex chars) padded_hash = sha256_hash.to_s.pad_left(32, '0') return padded_hash end # Correct implementation def correct_hash_processing(input) sha256_hash = Digest::SHA256.hexdigest(input) # FIX: Use padLeft(64, '0') for SHA-256 padded_hash = sha256_hash.to_s.pad_left(64, '0') return padded_hash end # Test cases demonstrating the vulnerability test_input = "example_input" puts "Original SHA-256 hash: #{Digest::SHA256.hexdigest(test_input)}" puts "Vulnerable (32 padding): #{vulnerable_hash_processing(test_input)}" puts "Correct (64 padding): #{correct_hash_processing(test_input)}" puts "Length vulnerable: #{vulnerable_hash_processing(test_input).length}" puts "Length correct: #{correct_hash_processing(test_input).length}"

{"cve": {"id": "CVE-2025-68702", "sourceIdentifier": "[email protected]", "published": "2026-01-13T20:16:07.390", "lastModified": "2026-01-20T17:13:09.277", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Jervis is a library for Job DSL plugin scripts and shared Jenkins pipeline libraries. Prior to 2.2, Jervis uses padLeft(32, '0') when it should use padLeft(64, '0') because SHA-256 produces 32 bytes which equates to 64 hex characters. This vulnerability is fixed in 2.2."}, {"lang": "es", "value": "Jervis es una biblioteca para scripts del plugin Job DSL y bibliotecas compartidas de pipeline de Jenkins. Antes de 2.2, Jervis utiliza padLeft(32, '0') cuando debería usar padLeft(64, '0') porque SHA-256 produce 32 bytes, lo que equivale a 64 caracteres hexadecimales. Esta vulnerabilidad está corregida en 2.2."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-327"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:samrocketman:jervis:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.2", "matchCriteriaId": "F1205448-6074-4B8A-B941-572D3D44F9E1"}]}]}], "references": [{"url": "https://github.com/samrocketman/jervis/commit/c3981ff71de7b0f767dfe7b37a2372cb2a51974a", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/samrocketman/jervis/security/advisories/GHSA-67rj-pjg6-pq59", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}