CVE-2022-22895
📋 TL;DR
CVE-2022-22895 is a heap buffer overflow vulnerability in Jerryscript 3.0.0's string-to-number conversion function. This allows attackers to write beyond allocated memory boundaries, potentially leading to arbitrary code execution or denial of service. Any system running vulnerable Jerryscript versions is affected.
💻 Affected Systems
- JerryScript
📦 What is this software?
Jerryscript by Jerryscript
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash causing denial of service, potentially with memory corruption that could be leveraged for further exploitation.
If Mitigated
Controlled crash with minimal impact if proper memory protections (ASLR, DEP) are enabled and exploit attempts are detected.
🎯 Exploit Status
Proof-of-concept code exists in GitHub issues. Exploitation requires crafting malicious JavaScript input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 3.0.0
Vendor Advisory: https://github.com/jerryscript-project/jerryscript/security/advisories
Restart Required: Yes
Instructions:
1. Update JerryScript to latest version. 2. Recompile applications using JerryScript. 3. Restart affected services/devices.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for JavaScript strings passed to conversion functions.
Memory Protection
linuxEnable ASLR and DEP/PaX to make exploitation more difficult.
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Network segmentation to isolate vulnerable devices
- Implement WAF rules to block suspicious JavaScript patterns
🔍 How to Verify
Check if Vulnerable:
Check JerryScript version: grep -r 'JERRY_VERSION' in source code or check package version.Check Version:
jerry --version or check JERRY_VERSION in source/config.hVerify Fix Applied:
Verify version is >3.0.0 and test with known PoC input that should no longer crash.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault crashes
- Memory corruption warnings
- Unusual JavaScript execution patterns
Network Indicators:
- Malformed JavaScript payloads in network traffic
SIEM Query:
source="application.log" AND "segmentation fault" AND process="jerry"