CVE-2023-32986
📋 TL;DR
The Jenkins File Parameter Plugin vulnerability allows attackers with Item/Configure permission to write arbitrary files with attacker-controlled content to the Jenkins controller file system. This affects Jenkins instances using the File Parameter Plugin version 285.v757c5b_67a_c25 and earlier. Attackers can potentially overwrite critical system files or deploy malicious payloads.
💻 Affected Systems
- Jenkins File Parameter Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Jenkins controller leading to remote code execution, data theft, or lateral movement within the network.
Likely Case
Unauthorized file creation/modification leading to privilege escalation, persistence mechanisms, or disruption of Jenkins operations.
If Mitigated
Limited impact if proper access controls and file system permissions restrict write access to sensitive directories.
🎯 Exploit Status
Exploitation requires Item/Configure permission. The vulnerability is straightforward to exploit once authenticated with appropriate permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 286.v0a_526a_b_78127 and later
Vendor Advisory: https://www.jenkins.io/security/advisory/2023-05-16/#SECURITY-3123
Restart Required: Yes
Instructions:
1. Update Jenkins File Parameter Plugin to version 286.v0a_526a_b_78127 or later via Jenkins Plugin Manager. 2. Restart Jenkins controller after plugin update.
🔧 Temporary Workarounds
Remove File Parameter Plugin
allUninstall the vulnerable plugin if not required for operations
Manage Jenkins > Manage Plugins > Installed > File Parameter Plugin > Uninstall
Restrict Item/Configure Permissions
allLimit users with Item/Configure permission to trusted administrators only
Manage Jenkins > Manage and Assign Roles > Configure Global Security > Project-based Matrix Authorization Strategy
🧯 If You Can't Patch
- Implement strict access controls to limit users with Item/Configure permission
- Monitor file system changes on Jenkins controller for unauthorized file writes
🔍 How to Verify
Check if Vulnerable:
Check installed plugin version via Manage Jenkins > Manage Plugins > Installed > File Parameter PluginCheck Version:
Check Jenkins web interface or plugin directory for file-parameters.jpi versionVerify Fix Applied:
Verify plugin version is 286.v0a_526a_b_78127 or later in plugin manager📡 Detection & Monitoring
Log Indicators:
- Unusual file parameter uploads
- File system writes to unexpected locations
- Jenkins audit logs showing Item/Configure actions
Network Indicators:
- HTTP POST requests to file parameter endpoints with unusual file names
SIEM Query:
source="jenkins" AND (event_type="file_upload" OR action="configure") AND file_name CONTAINS path_traversal_patterns