CVE-2024-9622
📋 TL;DR
This vulnerability in the resteasy-netty4 library allows HTTP request smuggling attacks using ASCII control characters. When exploited, it causes the Netty HttpObjectDecoder to enter a BAD_MESSAGE state, ignoring subsequent legitimate requests on the same connection and causing client timeouts. Systems using resteasy-netty4 with load balancers are primarily affected.
💻 Affected Systems
- resteasy-netty4
⚠️ 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
Denial of service affecting multiple clients through connection poisoning, potentially bypassing load balancer protections and disrupting service availability.
Likely Case
Client connection timeouts and degraded performance for users sharing affected connections, leading to intermittent service disruptions.
If Mitigated
Minimal impact with proper network segmentation, updated versions, and monitoring for abnormal HTTP traffic patterns.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP requests with ASCII control characters. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisories for specific patched versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2024-9622
Restart Required: Yes
Instructions:
1. Check current resteasy-netty4 version
2. Update to patched version per vendor advisory
3. Restart affected services
4. Verify fix implementation
🔧 Temporary Workarounds
HTTP Request Filtering
allImplement input validation to reject HTTP requests containing ASCII control characters
Implement custom HTTP filter or use WAF rules to block requests with control characters
Connection Timeout Reduction
allReduce HTTP connection timeout values to minimize impact of poisoned connections
Configure Netty connection timeout settings in application configuration
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block HTTP smuggling attempts
- Monitor for abnormal connection patterns and implement rate limiting on suspicious requests
🔍 How to Verify
Check if Vulnerable:
Check application dependencies for resteasy-netty4 library version and compare against patched versions in vendor advisoriesCheck Version:
Check Maven/Gradle dependencies or examine JAR manifests for resteasy-netty4 versionVerify Fix Applied:
Test with crafted HTTP requests containing ASCII control characters to ensure they are properly rejected or handled📡 Detection & Monitoring
Log Indicators:
- HTTP 400 Bad Request errors with BAD_MESSAGE state
- Unusual connection timeouts
- Requests with ASCII control characters in logs
Network Indicators:
- HTTP requests with control characters in headers or body
- Abnormal connection termination patterns
SIEM Query:
http.status_code:400 AND http.message:"BAD_MESSAGE" OR http.request contains control characters