CVE-2023-45318
📋 TL;DR
This critical vulnerability allows remote attackers to execute arbitrary code on systems running Weston Embedded uC-HTTP server by sending specially crafted network packets. The heap-based buffer overflow in HTTP server functionality can lead to complete system compromise. Any system using the vulnerable uC-HTTP server version is affected.
💻 Affected Systems
- Weston Embedded uC-HTTP
📦 What is this software?
Uc Http by Weston Embedded
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root/admin privileges, data exfiltration, ransomware deployment, and persistent backdoor installation.
Likely Case
Remote code execution leading to service disruption, data theft, and lateral movement within the network.
If Mitigated
Limited impact due to network segmentation, minimal privileges, and proper monitoring catching exploitation attempts.
🎯 Exploit Status
Exploitation requires crafting malicious network packets but no authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Weston Embedded for updated version
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2023-1843
Restart Required: Yes
Instructions:
1. Contact Weston Embedded for patched version
2. Update uC-HTTP server to latest version
3. Restart HTTP service
4. Verify fix is applied
🔧 Temporary Workarounds
Network Segmentation
linuxIsolate uC-HTTP servers from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable HTTP Server
allTemporarily disable HTTP functionality if not required
systemctl stop http_service_name
service http_service_name stop
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check uC-HTTP version against vulnerable commit 80d4004Check Version:
Check application documentation for version command or examine source codeVerify Fix Applied:
Verify updated version is installed and no longer matches vulnerable commit📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP request patterns
- Server crashes or restarts
- Memory allocation errors
Network Indicators:
- Malformed HTTP packets
- Unusual traffic to HTTP ports
- Exploit pattern detection
SIEM Query:
source="http_server" AND (event="buffer_overflow" OR event="crash" OR bytes_received>threshold)