CVE-2022-23118
📋 TL;DR
This vulnerability in Jenkins Debian Package Builder Plugin allows attackers who control Jenkins agent processes to execute arbitrary operating system commands on the Jenkins controller. Attackers can specify a malicious path to the git command-line tool, leading to remote code execution. Organizations using vulnerable versions of the plugin with untrusted agents are affected.
💻 Affected Systems
- Jenkins Debian Package Builder Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Jenkins controller with attacker gaining full control over the system, potentially leading to data theft, lateral movement, or deployment of malware.
Likely Case
Unauthorized command execution on the Jenkins controller, allowing attackers to access sensitive build artifacts, credentials, or modify build processes.
If Mitigated
Limited impact if proper agent isolation and access controls are implemented, restricting the ability to control agent processes.
🎯 Exploit Status
Exploitation requires control of agent processes; public exploit details exist in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.12
Vendor Advisory: https://www.jenkins.io/security/advisory/2022-01-12/#SECURITY-2546
Restart Required: Yes
Instructions:
1. Update Jenkins Debian Package Builder Plugin to version 1.6.12 or later via Jenkins Plugin Manager. 2. Restart Jenkins to apply the update. 3. Verify the plugin version in the Installed Plugins list.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the Debian Package Builder Plugin if immediate patching is not possible.
Navigate to Jenkins > Manage Jenkins > Manage Plugins > Installed tab, find 'Debian Package Builder Plugin', click 'Disable'
Restrict agent access
allImplement strict access controls and monitoring for Jenkins agents to prevent unauthorized control.
🧯 If You Can't Patch
- Isolate Jenkins agents in restricted network segments with minimal access to the controller.
- Implement strict monitoring and alerting for unusual agent behavior or command execution patterns.
🔍 How to Verify
Check if Vulnerable:
Check the plugin version in Jenkins: Navigate to Manage Jenkins > Manage Plugins > Installed tab, look for 'Debian Package Builder Plugin' and verify version is 1.6.11 or earlier.Check Version:
curl -s http://jenkins-url/pluginManager/api/json?depth=1 | jq '.plugins[] | select(.shortName=="debian-package-builder") | .version'Verify Fix Applied:
After updating, verify the plugin version shows 1.6.12 or later in the Installed Plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual git command executions from agents, especially with non-standard paths
- Suspicious process creation events on the Jenkins controller originating from agent connections
Network Indicators:
- Unexpected outbound connections from Jenkins controller to external systems following agent interactions
SIEM Query:
source="jenkins.log" AND ("git" AND "path" AND "agent") OR ("Debian Package Builder" AND "command")