CVE-2023-31907
📋 TL;DR
CVE-2023-31907 is a heap buffer overflow vulnerability in Jerryscript 3.0.0's scanner_literal_is_created function that could allow attackers to execute arbitrary code or cause denial of service. This affects systems running vulnerable versions of Jerryscript, a lightweight JavaScript engine commonly embedded in IoT devices and resource-constrained environments.
💻 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 persistent backdoor installation.
Likely Case
Application crash causing denial of service, potentially disrupting device functionality.
If Mitigated
Limited impact with proper memory protection mechanisms (ASLR, DEP) that may only cause crashes.
🎯 Exploit Status
Exploitation requires triggering the specific scanner function with crafted JavaScript input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 3.0.0
Vendor Advisory: https://github.com/jerryscript-project/jerryscript/issues/5073
Restart Required: Yes
Instructions:
1. Upgrade Jerryscript to version 3.0.1 or later. 2. Recompile any applications using Jerryscript. 3. Restart affected services or devices.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for JavaScript code processed by Jerryscript
Memory Protection
linuxEnable ASLR and DEP/XN on systems to reduce exploit effectiveness
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Network segmentation to isolate vulnerable devices
- Implement strict access controls to limit who can submit JavaScript to affected systems
🔍 How to Verify
Check if Vulnerable:
Check Jerryscript version: jerry --version should not return 3.0.0Check Version:
jerry --versionVerify Fix Applied:
Verify installed version is 3.0.1 or later and test with known problematic JavaScript inputs📡 Detection & Monitoring
Log Indicators:
- Segmentation fault crashes in Jerryscript processes
- Memory corruption warnings in system logs
Network Indicators:
- Unusual JavaScript payloads being sent to embedded devices
SIEM Query:
process_name:"jerry" AND (event_type:"crash" OR error_code:"SIGSEGV")