CVE-2024-42384
📋 TL;DR
An integer overflow vulnerability in Cesanta Mongoose Web Server v7.14 allows attackers to crash the server by sending specially crafted TLS packets. This affects all deployments using the vulnerable version of the Mongoose web server. The vulnerability can lead to denial of service and potential remote code execution.
💻 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 and data exfiltration
Likely Case
Denial of service through server crashes and segmentation faults
If Mitigated
Service disruption requiring manual restart but no data compromise
🎯 Exploit Status
Exploitation requires sending malformed TLS packets but no authentication
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 7.15 or later
Vendor Advisory: https://github.com/cesanta/mongoose/releases
Restart Required: Yes
Instructions:
1. Download Mongoose v7.15 or later from GitHub. 2. Replace existing Mongoose installation. 3. Restart all services using Mongoose.
🔧 Temporary Workarounds
Disable TLS
allTemporarily disable TLS encryption to prevent exploitation
Modify configuration to use HTTP instead of HTTPS
Network filtering
linuxBlock unexpected TLS packets at network perimeter
iptables -A INPUT -p tcp --dport 443 -m state --state NEW -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable servers
- Deploy WAF or IPS with rules to detect and block malformed TLS packets
🔍 How to Verify
Check if Vulnerable:
Check Mongoose version: grep -i 'mongoose' /proc/version or check application logsCheck Version:
mongoose --version or check source code version.hVerify Fix Applied:
Verify version is 7.15 or higher and test with malformed TLS packets📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors
- Unexpected server crashes
- Malformed TLS packet warnings
Network Indicators:
- Unexpected TLS handshake patterns
- Multiple connection attempts with malformed packets
SIEM Query:
source="mongoose.log" AND ("segmentation fault" OR "SIGSEGV")