CVE-2023-31922
📋 TL;DR
CVE-2023-31922 is a stack overflow vulnerability in QuickJS's js_proxy_isArray function that can lead to denial of service or potential remote code execution. This affects any application or system using vulnerable versions of the QuickJS JavaScript engine. Developers embedding QuickJS and users of applications built with it are at risk.
💻 Affected Systems
- QuickJS JavaScript Engine
📦 What is this software?
Quickjs by Quickjs Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution allowing full system compromise if the stack overflow can be leveraged for arbitrary code execution.
Likely Case
Denial of service causing application crashes or instability when processing malicious JavaScript.
If Mitigated
Limited impact with proper sandboxing and memory protection mechanisms in place.
🎯 Exploit Status
The vulnerability is in a core function and can be triggered by crafted JavaScript input. Public GitHub issues demonstrate the crash condition.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: QuickJS commit 2788d71 and later
Vendor Advisory: https://github.com/bellard/quickjs/issues/178
Restart Required: Yes
Instructions:
1. Update QuickJS to commit 2788d71 or later from the official repository. 2. Recompile any applications using QuickJS with the updated version. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for JavaScript code processed by QuickJS
Memory Limit Configuration
allConfigure memory limits and stack protection if available in your QuickJS integration
🧯 If You Can't Patch
- Isolate QuickJS execution in containers or sandboxes with limited privileges
- Implement network segmentation to limit access to systems using QuickJS
🔍 How to Verify
Check if Vulnerable:
Check QuickJS version or commit hash. If using git: git log --oneline | grep -i '2788d71'Check Version:
For compiled applications: strings binary_name | grep -i quickjs || check build configurationVerify Fix Applied:
Verify QuickJS is at commit 2788d71 or later: git rev-parse HEAD📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Stack overflow errors in application logs
- Abnormal termination of QuickJS processes
Network Indicators:
- Unusual JavaScript payloads being sent to services using QuickJS
SIEM Query:
process_name:"quickjs" AND (event_type:"crash" OR error_message:"stack overflow")