CVE-2024-10395
📋 TL;DR
This vulnerability in Zephyr RTOS's HTTP server allows buffer overflow attacks due to improper input length validation when processing file extensions. Attackers can exploit this to execute arbitrary code or crash affected devices. Systems running vulnerable Zephyr versions with HTTP server functionality are affected.
💻 Affected Systems
- Zephyr RTOS
📦 What is this software?
Zephyr by Zephyrproject
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or device takeover
Likely Case
Denial of service causing device crashes or instability
If Mitigated
Limited impact with proper input validation and memory protection mechanisms
🎯 Exploit Status
Requires sending specially crafted HTTP requests with malicious file extension data
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Zephyr security advisory for specific fixed version
Vendor Advisory: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hfww-j92m-x8fv
Restart Required: Yes
Instructions:
1. Update Zephyr RTOS to patched version. 2. Rebuild firmware with updated Zephyr source. 3. Deploy updated firmware to affected devices.
🔧 Temporary Workarounds
Disable HTTP Server
allDisable HTTP server functionality if not required
CONFIG_HTTP_SERVER=n in project configuration
Input Validation Filter
allImplement custom input validation for file extension processing
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable devices
- Deploy web application firewall (WAF) to filter malicious HTTP requests
🔍 How to Verify
Check if Vulnerable:
Check Zephyr version and verify HTTP server is enabled in configurationCheck Version:
Check Zephyr version in source code or build configurationVerify Fix Applied:
Verify Zephyr version is updated to patched version and rebuild firmware📡 Detection & Monitoring
Log Indicators:
- HTTP requests with unusually long file extensions
- Device crashes or restarts after HTTP requests
Network Indicators:
- HTTP requests with crafted Content-Type headers or file extensions
SIEM Query:
http.request.uri contains "." AND http.request.uri length > threshold