CVE-2025-24398
📋 TL;DR
The Jenkins Bitbucket Server Integration Plugin has a CSRF bypass vulnerability that allows attackers to craft malicious URLs that circumvent CSRF protections. This affects Jenkins instances running the plugin versions 2.1.0 through 4.1.3. Attackers could trick authenticated users into performing unauthorized actions.
💻 Affected Systems
- Jenkins Bitbucket Server Integration Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform administrative actions like creating new users, modifying configurations, or executing arbitrary code if combined with other vulnerabilities.
Likely Case
Attackers could modify Jenkins configurations, trigger builds, or manipulate source code integration settings without authorization.
If Mitigated
With proper network segmentation and access controls, impact would be limited to the Jenkins instance itself.
🎯 Exploit Status
Requires social engineering to trick authenticated users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.4 or later
Vendor Advisory: https://www.jenkins.io/security/advisory/2025-01-22/#SECURITY-3434
Restart Required: No
Instructions:
1. Navigate to Jenkins Manage Plugins. 2. Update Bitbucket Server Integration Plugin to version 4.1.4 or later. 3. No restart required for plugin updates in Jenkins.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the Bitbucket Server Integration Plugin if immediate patching is not possible.
🧯 If You Can't Patch
- Implement strict network access controls to limit Jenkins access to trusted users only.
- Enable CSRF protection at the network level using WAF rules to block suspicious requests.
🔍 How to Verify
Check if Vulnerable:
Check Jenkins plugin manager for Bitbucket Server Integration Plugin version. If version is between 2.1.0 and 4.1.3 inclusive, the system is vulnerable.Check Version:
Navigate to Jenkins -> Manage Jenkins -> Manage Plugins -> Installed tab, find Bitbucket Server Integration PluginVerify Fix Applied:
Verify plugin version is 4.1.4 or later in Jenkins plugin manager.📡 Detection & Monitoring
Log Indicators:
- Unusual Jenkins configuration changes from unexpected IP addresses
- Multiple failed CSRF token validations in Jenkins access logs
Network Indicators:
- HTTP POST requests to Jenkins endpoints without proper referrer headers
- Suspicious redirects to Jenkins URLs from external sources
SIEM Query:
source="jenkins.log" AND ("CSRF" OR "cross-site request forgery") AND ("bypass" OR "failed validation")