CVE-2023-31247
📋 TL;DR
A memory corruption vulnerability in Weston Embedded uC-HTTP v3.01.01's HTTP Server Host header parsing allows remote code execution via specially crafted network packets. This affects systems running the vulnerable version of uC-HTTP server software, potentially enabling attackers to take control of affected devices.
💻 Affected Systems
- Weston Embedded uC-HTTP
📦 What is this software?
Cesium Net by Weston Embedded
Uc Http by Weston Embedded
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the device, potentially leading to data theft, lateral movement, or persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to run arbitrary commands on vulnerable systems, potentially leading to service disruption or data exfiltration.
If Mitigated
Denial of service or system instability if exploitation attempts are blocked or fail, but no code execution occurs.
🎯 Exploit Status
Exploitation requires network access to the HTTP server but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.01.02 or later
Vendor Advisory: https://www.weston-embedded.com/security-advisories
Restart Required: Yes
Instructions:
1. Download latest uC-HTTP version from Weston Embedded. 2. Replace vulnerable files with patched version. 3. Recompile application if using source. 4. Restart HTTP service or reboot system.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to uC-HTTP servers using firewalls or network ACLs
Input Validation
allImplement proxy or WAF to validate and sanitize Host headers before reaching uC-HTTP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy web application firewall (WAF) with Host header validation rules
🔍 How to Verify
Check if Vulnerable:
Check uC-HTTP version in application configuration or by examining binary/library versionsCheck Version:
Check application configuration files or use system package manager commands specific to your deploymentVerify Fix Applied:
Verify uC-HTTP version is v3.01.02 or later and test HTTP server functionality📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with malformed Host headers
- HTTP server crashes or abnormal termination
Network Indicators:
- HTTP packets with unusually long or malformed Host headers
- Multiple rapid connection attempts to HTTP port
SIEM Query:
http.method=* AND http.host CONTAINS suspicious_pattern OR http.server="uC-HTTP/3.01.01"