CVE-2025-68931
📋 TL;DR
CVE-2025-68931 is a cryptographic vulnerability in Jervis library versions before 2.2 where AES/CBC/PKCS5Padding lacks authentication, enabling padding oracle attacks and ciphertext manipulation. This allows attackers to decrypt or tamper with encrypted data without knowing the encryption key. Organizations using vulnerable Jervis versions in Jenkins pipeline libraries are affected.
💻 Affected Systems
- Jervis (Jenkins pipeline library)
📦 What is this software?
Jervis by Samrocketman
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of encrypted secrets and pipeline configurations, leading to unauthorized code execution, credential theft, and supply chain attacks on Jenkins infrastructure.
Likely Case
Decryption of sensitive pipeline secrets (API keys, passwords, tokens) and manipulation of pipeline logic to execute malicious code in Jenkins jobs.
If Mitigated
Limited impact if encryption is used only for non-sensitive data or if network isolation prevents attacker access to padding oracle responses.
🎯 Exploit Status
Exploitation requires ability to interact with padding oracle (typically via network requests) and knowledge of cryptographic attack techniques; no public exploits known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2
Vendor Advisory: https://github.com/samrocketman/jervis/security/advisories/GHSA-gxp5-mv27-vjcj
Restart Required: No
Instructions:
1. Update Jervis library to version 2.2 or later. 2. Update Jenkins pipeline scripts to reference the new version. 3. Test pipeline functionality after update.
🔧 Temporary Workarounds
Disable vulnerable encryption usage
allTemporarily stop using Jervis encryption functions until patched
Modify Jenkins pipeline scripts to remove or replace Jervis encryption calls
Network isolation
allRestrict network access to Jenkins instances using Jervis
Configure firewall rules to limit access to Jenkins ports (typically 8080/8443)
🧯 If You Can't Patch
- Implement network segmentation to isolate Jenkins instances from untrusted networks
- Monitor for unusual pipeline execution patterns and encryption-related errors in logs
🔍 How to Verify
Check if Vulnerable:
Check Jervis version in Jenkins pipeline libraries; versions below 2.2 are vulnerable.Check Version:
grep -r 'jervis' Jenkinsfile or check Jenkins plugin/library manager for versionVerify Fix Applied:
Confirm Jervis version is 2.2 or higher in pipeline library configuration.📡 Detection & Monitoring
Log Indicators:
- Multiple failed decryption attempts with padding errors
- Unusual pipeline execution patterns
Network Indicators:
- High volume of requests to encryption/decryption endpoints with varying ciphertexts
SIEM Query:
source="jenkins.log" AND ("padding error" OR "decryption failed")