How the Mentioned CVE Works:
The Jenkins Open Redirect vulnerability (CVE-2025-XXXX) arises due to improper validation of URLs in redirect functionality. In Jenkins versions 2.499 and earlier, as well as LTS 2.492.1 and earlier, URLs starting with backslashes (\) were incorrectly classified as safe. This flaw allows attackers to craft malicious URLs that redirect users to external, potentially harmful sites. Browsers interpret backslashes as part of scheme-relative redirects, enabling phishing attacks. For example, an attacker could trick a user into clicking a Jenkins URL that redirects them to a malicious domain. Patched versions (2.500 and LTS 2.492.2) now reject such redirects, mitigating the risk.
DailyCVE Form:
Platform: Jenkins
Version: < 2.492.2, >= 2.493, < 2.500
Vulnerability: Open Redirect
Severity: Moderate
Date: Mar 6, 2025
(End of form)
What Undercode Say:
Analytics:
- Affected Versions: Jenkins < 2.492.2, >= 2.493, < 2.500
- Patched Versions: Jenkins 2.492.2, 2.500
- Exploitability: Requires user interaction (clicking a malicious link).
- Impact: Phishing, credential theft, or malware distribution.
Commands:
1. Check Jenkins Version:
java -jar jenkins.war --version
2. Upgrade Jenkins:
sudo apt-get update && sudo apt-get install jenkins
Exploit Details:
- Exploit URL Example:
http://jenkins-server/securityRealm/commenceLogin?from=\\attacker.com
- Browser Behavior: Browsers interpret `\\attacker.com` as `http://attacker.com`, enabling the redirect.
Protection Measures:
- Upgrade Jenkins: Ensure Jenkins is updated to version 2.500 or LTS 2.492.2.
- Input Validation: Implement strict URL validation for redirects.
3. Security Headers: Use `Content-Security-Policy` to restrict redirects.
Content-Security-Policy: default-src 'self';
4. Monitor Logs: Regularly check Jenkins logs for suspicious redirect attempts.
References:
- bash
- bash
- bash
By following these steps, users can mitigate the risk of open redirect attacks and secure their Jenkins instances.
References:
Reported By: https://github.com/advisories/GHSA-8hmv-92wm-39ch
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