CVE-2024-53868
📋 TL;DR
Apache Traffic Server is vulnerable to HTTP request smuggling when processing malformed chunked messages. This allows attackers to bypass security controls, poison caches, or hijack user sessions. Affected users are those running Apache Traffic Server versions 9.2.0-9.2.9 or 10.0.0-10.0.4.
💻 Affected Systems
- Apache Traffic Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could poison caches, bypass authentication, hijack user sessions, or perform web cache poisoning attacks leading to credential theft or malware distribution.
Likely Case
Cache poisoning leading to users receiving malicious content, session hijacking, or bypassing security filters and access controls.
If Mitigated
Limited impact if proper network segmentation, WAF filtering, and monitoring are in place, though the vulnerability still exists.
🎯 Exploit Status
Exploitation requires crafting malformed HTTP chunked messages but does not require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.2.10 or 10.0.5
Vendor Advisory: https://lists.apache.org/thread/rwyx91rsrnmpjbm04footfjjf6m9d1c9
Restart Required: Yes
Instructions:
1. Download Apache Traffic Server 9.2.10 or 10.0.5 from the official website. 2. Stop the Traffic Server service. 3. Backup configuration files. 4. Install the new version. 5. Restore configurations. 6. Start the service.
🔧 Temporary Workarounds
HTTP Request Filtering
allConfigure WAF or reverse proxy to filter malformed chunked HTTP requests.
🧯 If You Can't Patch
- Implement strict WAF rules to block malformed chunked HTTP requests.
- Monitor logs for unusual HTTP request patterns and implement network segmentation.
🔍 How to Verify
Check if Vulnerable:
Check Apache Traffic Server version using 'traffic_server -V' and compare against affected ranges.Check Version:
traffic_server -VVerify Fix Applied:
After patching, verify version is 9.2.10 or 10.0.5+ and test with known malformed chunked requests.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP request patterns, malformed chunked encoding in logs, cache poisoning attempts.
Network Indicators:
- HTTP requests with malformed Transfer-Encoding: chunked headers, unusual request smuggling patterns.
SIEM Query:
Search for HTTP requests containing 'Transfer-Encoding: chunked' with malformed chunk sizes or unusual patterns.