CVE-2024-39684
📋 TL;DR
CVE-2024-39684 is an integer overflow vulnerability in Tencent RapidJSON's ParseNumber() function that allows privilege escalation when parsing malicious JSON files. Attackers can craft JSON files that trigger the overflow when opened by vulnerable applications, potentially gaining elevated privileges. This affects any software using vulnerable versions of RapidJSON to parse untrusted JSON input.
💻 Affected Systems
- Tencent RapidJSON
- Applications using RapidJSON library
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining administrative/root privileges on the affected system, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to elevate from limited user accounts to higher privilege levels, enabling further lateral movement or data access within the system.
If Mitigated
Limited impact with proper privilege separation and sandboxing, potentially only causing application crashes or denial of service without privilege escalation.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of the vulnerable application's JSON parsing behavior. No public exploit code was found in the provided references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references - check vendor advisory for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-39684
Restart Required: Yes
Instructions:
1. Check Microsoft Security Advisory for patch details. 2. Update RapidJSON library to patched version. 3. Rebuild and redeploy applications using RapidJSON. 4. Restart affected services/applications.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation for JSON files, rejecting malformed or suspicious content before parsing
Privilege Reduction
allRun JSON parsing services with minimal necessary privileges using sandboxing or containerization
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using RapidJSON from critical assets
- Deploy application allowlisting to prevent execution of unauthorized applications that might exploit this vulnerability
🔍 How to Verify
Check if Vulnerable:
Check if applications use RapidJSON library and review version against vendor advisory. Use dependency scanning tools to identify RapidJSON usage.Check Version:
Check build configuration or dependency files (package.json, CMakeLists.txt, etc.) for RapidJSON version referencesVerify Fix Applied:
Verify RapidJSON library version has been updated to patched version. Test JSON parsing functionality with safe test files.📡 Detection & Monitoring
Log Indicators:
- Application crashes during JSON parsing
- Unexpected privilege escalation events
- Failed JSON parsing attempts with malformed input
Network Indicators:
- Unusual file transfers containing JSON data
- Suspicious file uploads to web applications
SIEM Query:
source="application_logs" AND ("rapidjson" OR "json parse error" OR "privilege escalation")