CVE-2024-42383
📋 TL;DR
This vulnerability in Cesanta Mongoose Web Server v7.14 allows attackers to write a NULL byte beyond the allocated memory for hostname fields. This could potentially lead to memory corruption and application instability. Organizations using vulnerable Mongoose versions are affected.
💻 Affected Systems
- Cesanta Mongoose Web Server
📦 What is this software?
Mongoose by Cesanta
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to denial of service, potential information disclosure, or remote code execution in specific configurations
Likely Case
Application crash or denial of service due to memory corruption
If Mitigated
Limited impact with proper memory protections and network segmentation
🎯 Exploit Status
Requires sending specially crafted requests to trigger the out-of-range pointer offset
🛠️ 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 embedded version. 4. Restart affected services.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for hostname fields before processing
# Configure web application firewall rules to validate hostname length
# Implement custom request filtering in application code
Network Segmentation
linuxRestrict access to Mongoose services to trusted networks only
iptables -A INPUT -p tcp --dport [Mongoose_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [Mongoose_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy web application firewall with request validation rules
🔍 How to Verify
Check if Vulnerable:
Check Mongoose version in use; v7.14 is vulnerableCheck Version:
Check application logs or run 'strings [mongoose_binary] | grep -i version'Verify Fix Applied:
Verify Mongoose version is v7.15 or later after update📡 Detection & Monitoring
Log Indicators:
- Application crashes
- Memory access violation errors
- Unusual hostname field lengths in requests
Network Indicators:
- Requests with abnormally long hostname fields
- Multiple connection attempts with malformed headers
SIEM Query:
source="mongoose.log" AND ("segmentation fault" OR "memory violation" OR hostname_length>255)