CVE-2023-50778
📋 TL;DR
A CSRF vulnerability in Jenkins PaaSLane Estimate Plugin allows attackers to trick authenticated users into making unauthorized requests to attacker-controlled URLs with attacker-specified tokens. This affects all Jenkins instances running PaaSLane Estimate Plugin version 1.0.4 or earlier.
💻 Affected Systems
- Jenkins PaaSLane Estimate Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could connect Jenkins to malicious external services, potentially leading to data exfiltration, credential theft, or further compromise of the Jenkins environment.
Likely Case
Attackers could redirect Jenkins to connect to attacker-controlled endpoints, potentially harvesting sensitive information or using Jenkins as a pivot point for further attacks.
If Mitigated
With proper CSRF protections and network segmentation, impact is limited to potential unauthorized external connections from the Jenkins server.
🎯 Exploit Status
Exploitation requires tricking an authenticated user into visiting a malicious page while logged into Jenkins.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.5 or later
Vendor Advisory: https://www.jenkins.io/security/advisory/2023-12-13/#SECURITY-3179
Restart Required: Yes
Instructions:
1. Update Jenkins PaaSLane Estimate Plugin to version 1.0.5 or later via Jenkins Plugin Manager. 2. Restart Jenkins to apply the update.
🔧 Temporary Workarounds
Disable PaaSLane Estimate Plugin
allTemporarily disable the vulnerable plugin until patching is possible
Navigate to Jenkins > Manage Jenkins > Manage Plugins > Installed tab > Find 'PaaSLane Estimate Plugin' > Disable
Implement CSRF Protection Headers
allAdd CSRF protection headers to Jenkins web interface
Configure Jenkins with CSRF protection enabled in security settings
🧯 If You Can't Patch
- Restrict network access to Jenkins to trusted users only
- Implement web application firewall rules to detect CSRF attempts
🔍 How to Verify
Check if Vulnerable:
Check Jenkins plugin manager for PaaSLane Estimate Plugin version. If version is 1.0.4 or earlier, system is vulnerable.Check Version:
Navigate to Jenkins > Manage Jenkins > Manage Plugins > Installed tab > Find 'PaaSLane Estimate Plugin'Verify Fix Applied:
Verify plugin version is 1.0.5 or later in Jenkins plugin manager.📡 Detection & Monitoring
Log Indicators:
- Unusual external connection attempts from Jenkins
- CSRF token validation failures
Network Indicators:
- Unexpected outbound connections from Jenkins to unknown external URLs
SIEM Query:
source="jenkins" AND ("PaaSLane" OR "CSRF" OR "token validation")