CVE-2024-42390
📋 TL;DR
This vulnerability in Cesanta Mongoose Web Server v7.14 allows attackers to send specially crafted TLS packets that cause the server to read memory outside intended heap boundaries. This could potentially leak sensitive information from server memory. Any system running the vulnerable Mongoose Web Server version is affected.
💻 Affected Systems
- Cesanta Mongoose Web Server
📦 What is this software?
Mongoose by Cesanta
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure of sensitive data from server memory, potentially including credentials, session tokens, or application data
Likely Case
Partial memory leak revealing non-sensitive data or causing application instability
If Mitigated
No impact if proper network segmentation and TLS inspection are in place
🎯 Exploit Status
Requires ability to send crafted TLS packets to vulnerable server
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v7.15 or later
Vendor Advisory: https://github.com/cesanta/mongoose/releases
Restart Required: Yes
Instructions:
1. Download latest Mongoose version from GitHub. 2. Replace existing Mongoose files. 3. Recompile if using source. 4. Restart affected services.
🔧 Temporary Workarounds
Disable TLS/SSL
allRemove TLS functionality if not required
Modify configuration to use HTTP only
Network filtering
linuxBlock or filter TLS traffic to vulnerable servers
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable servers
- Deploy WAF or TLS inspection to detect/block malicious TLS packets
🔍 How to Verify
Check if Vulnerable:
Check Mongoose version in application logs or configuration filesCheck Version:
Check application logs or grep for mongoose version in source/configVerify Fix Applied:
Verify Mongoose version is v7.15 or later after update📡 Detection & Monitoring
Log Indicators:
- Unexpected TLS handshake failures
- Application crashes or memory errors
Network Indicators:
- Unusual TLS packet patterns
- Multiple failed TLS connections
SIEM Query:
source="mongoose.log" AND ("TLS error" OR "memory fault")