Jenkins Fingerprints Information Disclosure Vulnerability (CVE-2015-5317) Analysis & Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTJenkins weekly versions prior to 1.638 and LTS versions prior to 1.625.2
Unauthenticated remote attackers can obtain sensitive job and build name information via direct HTTP requests to fingerprint pages.
Immediately upgrade Jenkins to LTS 1.625.2+ or weekly 1.638+, and restrict unauthorized access to the fingerprint endpoints.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The primary remediation is upgrading Jenkins to a patched release (LTS 1.625.2 or weekly 1.638 and above).
For Red Hat/CentOS/RHEL environments, use the following commands:
# Update Jenkins package via yum/dnf
sudo yum update -y jenkins
# Restart the service to apply changes
sudo systemctl restart jenkins
sudo systemctl status jenkins2. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, deploy a reverse proxy rule to block unauthenticated access to the /fingerprint path, or disable anonymous read access in the Jenkins Global Security configuration.
Example Nginx configuration to restrict access to the fingerprint endpoint:
# Add inside the server block of your Nginx configuration
location /fingerprint/ {
allow 10.0.0.0/8; # Allow internal network only
deny all; # Block all other traffic
proxy_pass http://127.0.0.1:8080;
}3. Log Audit & IoC Verification Commands
Use the following commands to verify your running Jenkins version and inspect access logs for potential reconnaissance attempts targeting the fingerprint endpoint.
# Retrieve the running Jenkins version from the HTTP header
curl -sI http://localhost:8080 | grep -i 'X-Jenkins'
# Scan access logs for unauthorized requests to the fingerprint directory
grep -i 'GET /fingerprint/' /var/log/jenkins/access.log | awk '{print $1, $7, $9}'Scan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2015-5317) is an information disclosure flaw (CWE-200) residing in the Fingerprints tracking mechanism of Jenkins. Jenkins utilizes MD5 checksums to track file usage across different builds and jobs. However, the application fails to enforce proper authorization checks (Job/Read permissions) when rendering fingerprint details. Consequently, any user who knows or guesses a file's MD5 hash can directly query the fingerprint page to retrieve associated metadata.
2. Exploitation Mechanics & Attack Scenario
An attacker can craft a direct HTTP GET request targeting the /fingerprint/[MD5_HASH] endpoint. In a secure configuration, Jenkins should validate whether the requesting session possesses read permissions for the associated jobs. In vulnerable versions, this validation is bypassed, allowing anonymous users to view the names of private jobs, build numbers, and filenames associated with the hash. Attackers can leverage hashes of common open-source libraries to map out internal pipeline structures and identify proprietary project names.
3. Infrastructure & Business Impact
Given its inclusion in the CISA KEV catalog, this vulnerability is actively monitored and exploited. Exposure of internal job and build names leaks intelligence regarding an organization's internal software architecture, proprietary project codenames, and development pipelines. This metadata serves as critical reconnaissance data, enabling adversaries to orchestrate highly targeted downstream attacks, such as supply chain compromises or targeted phishing campaigns.
Official Vendor Advisories & References
The Fingerprints pages in Jenkins before 1.638 and LTS before 1.625.2 might allow remote attackers to obtain sensitive job and build name information via a direct request.
Frequently Asked SecOps Questions (CVE-2015-5317)
FAQQ1. How critical is CVE-2015-5317 and is it actively exploited in the wild?
CVE-2015-5317 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 23.0%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2015-5317?
Primary impacted vendors include jenkins across jenkins. Scope summary: Jenkins weekly before 1.638, LTS before 1.625.2
Q3. What temporary mitigations or workarounds exist for CVE-2015-5317 before patching?
[Mitigation] Immediately upgrade Jenkins to LTS 1.625.2+ or weekly 1.638+, and restrict unauthorized access to the fingerprint endpoints. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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