CVE-2024-11734
📋 TL;DR
A denial-of-service vulnerability in Keycloak allows administrative users with realm settings modification privileges to disrupt service by injecting newlines into security headers. This causes the server to write to already-terminated requests, leading to request failures. Only authenticated administrative users with specific permissions are affected.
💻 Affected Systems
- Keycloak
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Administrative user causes complete service disruption, making Keycloak unavailable for authentication and authorization services.
Likely Case
Targeted DoS attacks against specific realms or services, causing intermittent authentication failures.
If Mitigated
Limited impact with proper administrative access controls and monitoring in place.
🎯 Exploit Status
Exploitation requires authenticated administrative access and knowledge of the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Keycloak 24.0.10, 25.0.6, or 26.0.0
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2024-11734
Restart Required: Yes
Instructions:
1. Backup Keycloak configuration and database. 2. Download and install patched version (24.0.10, 25.0.6, or 26.0.0). 3. Restart Keycloak service. 4. Verify service functionality.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative user permissions and implement principle of least privilege.
Input Validation Proxy
allDeploy WAF or reverse proxy to filter newline characters in security headers.
🧯 If You Can't Patch
- Implement strict administrative access controls and monitor for unusual realm setting changes.
- Deploy network segmentation to isolate Keycloak administrative interfaces from regular users.
🔍 How to Verify
Check if Vulnerable:
Check Keycloak version via admin console or by examining server logs for version information.Check Version:
Check Keycloak server logs or use: java -jar keycloak-admin-cli.jar --versionVerify Fix Applied:
Verify installed version is 24.0.10, 25.0.6, or 26.0.0 or higher, and test administrative functions.📡 Detection & Monitoring
Log Indicators:
- Unusual realm setting modifications
- Multiple failed requests from administrative users
- Error logs mentioning terminated requests
Network Indicators:
- Unusual patterns in administrative API calls
- Spikes in failed authentication requests
SIEM Query:
source="keycloak" AND ("realm settings modified" OR "security headers" OR "request terminated")