CVE-2023-45811
📋 TL;DR
This CVE describes a __proto__ pollution vulnerability in Synchrony deobfuscator versions before 2.4.4 that allows attackers to modify the Object prototype through crafted input to the LiteralMap transformer. Successful exploitation could lead to arbitrary code execution. Users of vulnerable versions of this JavaScript deobfuscation tool are affected.
💻 Affected Systems
- Synchrony deobfuscator
📦 What is this software?
Synchrony by Relative
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Local privilege escalation or denial of service through prototype pollution attacks.
If Mitigated
Limited impact with proper input validation and security controls in place.
🎯 Exploit Status
Exploitation requires crafting specific input to trigger the prototype pollution vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: deobfuscator@2.4.4
Vendor Advisory: https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx
Restart Required: No
Instructions:
1. Update package.json to specify 'deobfuscator': '^2.4.4' 2. Run 'npm update deobfuscator' 3. Verify installation with 'npm list deobfuscator'
🔧 Temporary Workarounds
Disable __proto__ manipulation
allLaunch Node.js with flags to disable __proto__ manipulation
node --disable-proto=delete your_script.js
node --disable-proto=throw your_script.js
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Run the application with minimal privileges and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check package.json for deobfuscator version <2.4.4 or run 'npm list deobfuscator'Check Version:
npm list deobfuscator | grep deobfuscatorVerify Fix Applied:
Confirm deobfuscator version is 2.4.4 or higher using 'npm list deobfuscator'📡 Detection & Monitoring
Log Indicators:
- Unusual prototype modification attempts
- Unexpected object property changes
- Stack traces showing LiteralMap transformer errors
Network Indicators:
- Malformed JavaScript input patterns
- Suspicious deobfuscation requests
SIEM Query:
source="application_logs" AND ("__proto__" OR "prototype pollution" OR "LiteralMap")🔗 References
- https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40
- https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx
- https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts
- https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40
- https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx
- https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts
