CVE-2024-6381
📋 TL;DR
The bson_strfreev function in MongoDB's C driver library contains an integer overflow vulnerability that can cause memory corruption when freeing memory at a negative offset. This affects applications using libbson versions before 1.26.2. The vulnerability could potentially lead to crashes or arbitrary code execution in affected systems.
💻 Affected Systems
- MongoDB C Driver (libbson)
📦 What is this software?
Libbson by Mongodb
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if combined with other vulnerabilities
Likely Case
Application crash or denial of service due to memory corruption
If Mitigated
Limited impact with proper memory protections and exploit mitigations
🎯 Exploit Status
Exploitation requires specific conditions and memory manipulation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.26.2
Vendor Advisory: https://jira.mongodb.org/browse/CDRIVER-5622
Restart Required: Yes
Instructions:
1. Identify libbson version currently installed. 2. Update to libbson 1.26.2 or later. 3. Recompile any applications using the library. 4. Restart affected services.
🔧 Temporary Workarounds
Avoid bson_strfreev usage
allModify code to avoid using the vulnerable bson_strfreev function
🧯 If You Can't Patch
- Implement strict input validation and sanitization
- Enable memory protection mechanisms like ASLR and DEP
🔍 How to Verify
Check if Vulnerable:
Check libbson version with: pkg-config --modversion libbson-1.0Check Version:
pkg-config --modversion libbson-1.0Verify Fix Applied:
Verify version is 1.26.2 or higher using same command📡 Detection & Monitoring
Log Indicators:
- Application crashes, segmentation faults, memory corruption errors
Network Indicators:
- Unusual application behavior or service disruptions
SIEM Query:
Process termination with exit code 139 (SIGSEGV) from MongoDB-related processes