CVE-2025-68704
📋 TL;DR
Jervis versions before 2.2 use java.util.Random() for timing attack mitigation, which is not cryptographically secure. This vulnerability could allow attackers to predict random values and potentially bypass security controls. Organizations using vulnerable Jervis versions in Jenkins pipeline libraries are affected.
💻 Affected Systems
- Jervis
📦 What is this software?
Jervis by Samrocketman
⚠️ Risk & Real-World Impact
Worst Case
Attackers could predict random values used in security-sensitive operations, potentially bypassing authentication, authorization, or other security controls in Jenkins pipelines.
Likely Case
Attackers with access to the Jenkins environment could exploit predictable random values to gain unauthorized access to pipeline resources or manipulate job execution.
If Mitigated
With proper network segmentation and access controls, exploitation would require internal access, limiting the attack surface.
🎯 Exploit Status
Exploitation requires understanding of the specific Jervis implementation and access to the Jenkins environment. No public exploits have been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2
Vendor Advisory: https://github.com/samrocketman/jervis/security/advisories/GHSA-c9q6-g3hr-8gww
Restart Required: Yes
Instructions:
1. Update Jervis library to version 2.2 or later. 2. Update Jenkins pipeline configurations to reference the new version. 3. Restart Jenkins to apply changes. 4. Verify pipeline libraries are using the updated version.
🔧 Temporary Workarounds
Replace Jervis with custom secure implementation
allManually replace Jervis library calls with cryptographically secure random number generation using java.security.SecureRandom
Replace java.util.Random() calls with new java.security.SecureRandom() in pipeline scripts
🧯 If You Can't Patch
- Implement strict access controls to Jenkins environment to limit potential attackers
- Monitor Jenkins logs for unusual pipeline execution patterns or unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check Jenkins pipeline library configurations for Jervis version. If version is below 2.2, the system is vulnerable.Check Version:
Check Jenkins pipeline library configuration files or use Jenkins script console: println(org.jenkinsci.plugins.workflow.libs.LibraryConfiguration.getAll())Verify Fix Applied:
Verify Jervis version in Jenkins pipeline libraries is 2.2 or higher. Test pipeline execution to ensure functionality is maintained.📡 Detection & Monitoring
Log Indicators:
- Unusual pipeline execution patterns
- Failed authentication attempts in Jenkins logs
- Unexpected changes to pipeline configurations
Network Indicators:
- Unusual API calls to Jenkins from unauthorized sources
- Suspicious network traffic to Jenkins controller
SIEM Query:
source="jenkins.log" AND ("authentication failure" OR "pipeline modification" OR "unauthorized access")