CVE-2019-10328
📋 TL;DR
This vulnerability in Jenkins Pipeline Remote Loader Plugin allows attackers to bypass script security sandbox protections and execute arbitrary code on Jenkins servers. It affects Jenkins installations using Pipeline Remote Loader Plugin version 1.4 or earlier. Attackers can achieve remote code execution with significant impact on CI/CD pipelines.
💻 Affected Systems
- Jenkins Pipeline Remote Loader Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Jenkins server leading to unauthorized code execution, data exfiltration, lateral movement within the network, and potential supply chain attacks through CI/CD pipeline manipulation.
Likely Case
Attackers gain remote code execution on Jenkins servers, allowing them to steal credentials, modify build processes, deploy malicious artifacts, and potentially pivot to other systems in the environment.
If Mitigated
With proper network segmentation and access controls, impact is limited to the Jenkins server itself, though credential theft and pipeline manipulation remain significant risks.
🎯 Exploit Status
Exploitation requires authenticated access to Jenkins, but the vulnerability bypasses script security sandbox protections making exploitation straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Pipeline Remote Loader Plugin 1.5
Vendor Advisory: https://jenkins.io/security/advisory/2019-05-31/#SECURITY-921
Restart Required: Yes
Instructions:
1. Update Jenkins to latest version. 2. Navigate to Manage Jenkins > Manage Plugins. 3. Update Pipeline Remote Loader Plugin to version 1.5 or later. 4. Restart Jenkins service.
🔧 Temporary Workarounds
Disable Pipeline Remote Loader Plugin
allTemporarily disable the vulnerable plugin until patching can be completed
Navigate to Manage Jenkins > Manage Plugins > Installed tab
Find Pipeline Remote Loader Plugin and click Disable
Restrict Jenkins Access
allImplement strict access controls and network segmentation for Jenkins servers
Configure firewall rules to restrict Jenkins access to authorized users only
Implement IP whitelisting for Jenkins management interface
🧯 If You Can't Patch
- Immediately disable Pipeline Remote Loader Plugin if not required
- Implement strict authentication and authorization controls, limiting Jenkins access to essential personnel only
🔍 How to Verify
Check if Vulnerable:
Check Jenkins plugin manager for Pipeline Remote Loader Plugin version. If version is 1.4 or earlier, the system is vulnerable.Check Version:
Check Jenkins web interface at Manage Jenkins > Manage Plugins > Installed tab, or examine $JENKINS_HOME/plugins/pipeline-remote-loader/META-INF/MANIFEST.MFVerify Fix Applied:
Verify Pipeline Remote Loader Plugin version is 1.5 or later in Manage Jenkins > Manage Plugins > Installed tab.📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy script execution patterns
- Unexpected pipeline builds or modifications
- Authentication logs showing unauthorized access attempts
Network Indicators:
- Unusual outbound connections from Jenkins server
- Unexpected HTTP requests to Jenkins API endpoints
SIEM Query:
source="jenkins.log" AND ("Pipeline Remote Loader" OR "script security" OR "sandbox bypass")🔗 References
- http://www.openwall.com/lists/oss-security/2019/05/31/2
- http://www.securityfocus.com/bid/108540
- https://access.redhat.com/errata/RHBA-2019:1605
- https://access.redhat.com/errata/RHSA-2019:1636
- https://jenkins.io/security/advisory/2019-05-31/#SECURITY-921
- http://www.openwall.com/lists/oss-security/2019/05/31/2
- http://www.securityfocus.com/bid/108540
- https://access.redhat.com/errata/RHBA-2019:1605
- https://access.redhat.com/errata/RHSA-2019:1636
- https://jenkins.io/security/advisory/2019-05-31/#SECURITY-921
