Jenkins, Sensitive Data Exposure, CVE-2025-31725 (Critical)

How CVE-2025-31725 Works

The Jenkins monitor-remote-job Plugin 1.0 fails to encrypt passwords stored in job `config.xml` files on the Jenkins controller. These credentials are exposed in plaintext to users with Extended Read permissions or anyone with filesystem access to the Jenkins controller. Attackers can extract credentials by reading the XML configuration or through Jenkins API calls, leading to unauthorized access to remote systems where these credentials are reused.

DailyCVE Form:

Platform: Jenkins
Version: monitor-remote-job Plugin 1.0
Vulnerability: Plaintext Password Storage
Severity: Critical
Date: 04/17/2025

What Undercode Say:

Exploitation:

1. Extract Passwords via File Access:

grep -r "password" /var/lib/jenkins/jobs/

2. API-Based Credential Dump:

curl -s -k -u "attacker:password" http://jenkins-server/job/[bash]/config.xml | grep "password"

Mitigation:

1. Immediate Actions:

Upgrade to monitor-remote-job Plugin 2.0+
Rotate all exposed credentials
```
jenkins-cli delete-credentials [bash]
```

2. Configuration Hardening:

Restrict filesystem permissions:

chmod 600 /var/lib/jenkins/jobs//config.xml

Revoke Extended Read permissions for non-admin users via Jenkins RBAC.

Detection:

1. Audit Script for Exposed Secrets:

import xml.etree.ElementTree as ET
for config in Path("/var/lib/jenkins/jobs").rglob("config.xml"):
tree = ET.parse(config)
if "password" in ET.tostring(tree.getroot()).decode():
print(f"Exposed secret in {config}")

2. Jenkins Groovy Check:

Jenkins.instance.getAllItems().each { job ->
if (job.configFile.file.text.contains("password")) {
println("Vulnerable job: ${job.name}")
}
}