CVE-2023-36109
📋 TL;DR
A buffer overflow vulnerability in JerryScript 3.0's ecma_stringbuilder_append_raw component allows remote attackers to execute arbitrary code. This affects systems running vulnerable versions of JerryScript, a lightweight JavaScript engine commonly embedded in IoT devices and resource-constrained environments. Attackers can exploit this to gain full control of affected systems.
💻 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, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to run arbitrary commands, potentially leading to device takeover in IoT deployments.
If Mitigated
Denial of service or application crash if exploit attempts are blocked by security controls.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.0.1 or later
Vendor Advisory: https://github.com/jerryscript-project/jerryscript/issues/5080
Restart Required: Yes
Instructions:
1. Update JerryScript to version 3.0.1 or later. 2. Recompile any applications using JerryScript. 3. Restart affected services or devices.
🔧 Temporary Workarounds
Disable vulnerable component
allIf possible, disable or restrict access to the ecma_stringbuilder_append_raw functionality in JerryScript.
# Requires code modification - no direct command
Network segmentation
allIsolate devices running JerryScript from untrusted networks.
# Configure firewall rules to restrict access to JerryScript services
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy runtime application self-protection (RASP) or web application firewall (WAF) with buffer overflow protection
🔍 How to Verify
Check if Vulnerable:
Check JerryScript version: if version is exactly 3.0, system is vulnerable.Check Version:
jerry --version or check build configuration filesVerify Fix Applied:
Verify JerryScript version is 3.0.1 or later after update.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from JerryScript
- Memory access violations in system logs
- Application crashes with segmentation faults
Network Indicators:
- Unexpected network connections from JerryScript processes
- Suspicious payloads targeting JerryScript ports
SIEM Query:
source="*jerry*" AND (event_type="crash" OR event_type="segfault")