CVE-2024-42386
📋 TL;DR
This vulnerability in Cesanta Mongoose Web Server allows attackers to cause a segmentation fault by sending specially crafted TLS packets. It affects all systems running vulnerable versions of Mongoose Web Server, potentially leading to denial of service or remote code execution. The vulnerability stems from improper pointer arithmetic when handling TLS packets.
💻 Affected Systems
- Cesanta Mongoose Web Server
📦 What is this software?
Mongoose by Cesanta
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or lateral movement within the network.
Likely Case
Denial of service through application crash, disrupting web services and potentially causing system instability.
If Mitigated
Limited impact with proper network segmentation and monitoring, potentially only causing temporary service disruption.
🎯 Exploit Status
Exploitation requires sending specially crafted TLS packets but does not require authentication. The vulnerability is in the TLS handshake processing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v7.15 or later
Vendor Advisory: https://github.com/cesanta/mongoose/releases
Restart Required: Yes
Instructions:
1. Check current Mongoose version
2. Download latest version from GitHub releases
3. Replace vulnerable binary with patched version
4. Restart the Mongoose service
🔧 Temporary Workarounds
Disable TLS
allTemporarily disable TLS/SSL encryption if the service can operate without it
Modify Mongoose configuration to use HTTP instead of HTTPS
Network Filtering
allUse firewall rules to restrict access to Mongoose server
iptables -A INPUT -p tcp --dport 443 -j DROP (Linux)
netsh advfirewall firewall add rule name="Block Mongoose" dir=in action=block protocol=TCP localport=443 (Windows)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Mongoose version is 7.14 or earlier and TLS is enabledCheck Version:
./mongoose --version or check application logs for version informationVerify Fix Applied:
Verify Mongoose version is 7.15 or later and test TLS connectivity📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in system logs
- Unexpected Mongoose process termination
- Abnormal TLS handshake patterns
Network Indicators:
- Malformed TLS packets to port 443 (or custom HTTPS port)
- Multiple connection attempts with unusual TLS versions or ciphers
SIEM Query:
source="*mongoose*" AND ("segmentation fault" OR "SIGSEGV" OR "crash")