CVE-2024-42388
📋 TL;DR
This vulnerability in Cesanta Mongoose Web Server allows attackers to send specially crafted TLS packets that cause the server to read memory outside intended heap boundaries. This affects all systems running vulnerable versions of Mongoose Web Server with TLS enabled. The vulnerability could lead to information disclosure or potential denial of service.
💻 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 heap memory, potentially including credentials, session tokens, or application data, leading to further compromise.
Likely Case
Application crash or denial of service due to invalid memory access, with possible limited information leakage.
If Mitigated
Minimal impact if proper network segmentation and TLS termination controls are in place.
🎯 Exploit Status
Exploitation requires sending specially crafted TLS packets to the 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 Mongoose Web Server v7.15 or later from the official repository. 2. Replace the vulnerable binary with the patched version. 3. Restart the Mongoose Web Server service.
🔧 Temporary Workarounds
Disable TLS
allIf TLS functionality is not required, disable TLS to eliminate the attack vector.
Modify Mongoose configuration to use HTTP only
Network Segmentation
allRestrict access to Mongoose Web Server to trusted networks only.
Configure firewall rules to limit incoming connections
🧯 If You Can't Patch
- Implement network-level TLS termination using a reverse proxy or load balancer
- Apply strict network access controls to limit exposure to untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check the Mongoose Web Server version. If running v7.14 with TLS enabled, the system is vulnerable.Check Version:
mongoose --version or check the server startup logsVerify Fix Applied:
Verify the Mongoose Web Server version is v7.15 or later and test TLS functionality.📡 Detection & Monitoring
Log Indicators:
- Unexpected server crashes
- Memory access violation errors in logs
- Abnormal TLS handshake failures
Network Indicators:
- Unusual TLS packet patterns
- Multiple connection attempts with malformed TLS data
SIEM Query:
source="mongoose" AND (event="crash" OR event="error" OR message="*memory*" OR message="*TLS*")