CVE-2023-38562
📋 TL;DR
A double-free vulnerability in Weston Embedded uC-TCP-IP v3.06.01's IP header loopback parsing allows memory corruption via specially crafted network packets. This can lead to remote code execution on affected systems. Any device using this vulnerable TCP/IP stack version is at risk.
💻 Affected Systems
- Weston Embedded uC-TCP-IP
📦 What is this software?
Uc Tcp Ip by Weston Embedded
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains full system control through code execution, potentially compromising the entire device.
Likely Case
System crash or denial of service due to memory corruption, with potential for code execution in targeted attacks.
If Mitigated
Limited impact if network segmentation and strict firewall rules prevent access to vulnerable services.
🎯 Exploit Status
Exploitation requires crafting specific network packets but no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.06.02 or later
Vendor Advisory: https://www.weston-embedded.com/security-advisories
Restart Required: Yes
Instructions:
1. Obtain updated uC-TCP-IP library from Weston Embedded. 2. Replace vulnerable version with patched version. 3. Recompile and redeploy affected applications. 4. Restart systems using the updated stack.
🔧 Temporary Workarounds
Network Segmentation
allIsolate devices using uC-TCP-IP from untrusted networks
Firewall Rules
linuxBlock unnecessary network traffic to affected devices
iptables -A INPUT -p tcp --dport [PORT] -j DROP
iptables -A INPUT -p udp --dport [PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor for abnormal network traffic patterns and system crashes
🔍 How to Verify
Check if Vulnerable:
Check application/library version against uC-TCP-IP v3.06.01Check Version:
Check application documentation or build configuration for uC-TCP-IP versionVerify Fix Applied:
Verify uC-TCP-IP version is v3.06.02 or later📡 Detection & Monitoring
Log Indicators:
- System crashes
- Memory corruption errors
- Unexpected process termination
Network Indicators:
- Unusual packet sequences to loopback interface
- Malformed IP packets
SIEM Query:
source="network" AND (packet_size>1500 OR ip_frag_offset>0) AND dest_ip=127.0.0.1