CVE-2020-24344
📋 TL;DR
CVE-2020-24344 is a buffer over-read vulnerability in JerryScript's JavaScript engine affecting versions through 2.3.0. This allows reading memory beyond allocated buffers, potentially exposing sensitive information or causing crashes. Systems using JerryScript for IoT devices, embedded systems, or JavaScript execution are affected.
💻 Affected Systems
- JerryScript JavaScript engine
- IoT devices using JerryScript
- Embedded systems with JerryScript
📦 What is this software?
Jerryscript by Jerryscript
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure of sensitive memory contents, denial of service through application crashes, or potential remote code execution if combined with other vulnerabilities.
Likely Case
Application crashes or denial of service in JerryScript-based applications, potentially exposing limited memory contents.
If Mitigated
Controlled crashes without data exposure if memory protections are enabled, though availability impact remains.
🎯 Exploit Status
Exploitation requires crafting specific JavaScript code with function({a=arguments}){const arguments} pattern to trigger the buffer over-read.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: JerryScript 2.4.0 and later
Vendor Advisory: https://github.com/jerryscript-project/jerryscript/issues/3976
Restart Required: Yes
Instructions:
1. Update JerryScript to version 2.4.0 or later. 2. Recompile applications using JerryScript. 3. Restart affected services or devices.
🔧 Temporary Workarounds
Input validation and sanitization
allValidate and sanitize JavaScript input to prevent execution of malicious patterns
Memory protection controls
linuxEnable ASLR and other memory protection mechanisms to limit impact
🧯 If You Can't Patch
- Isolate JerryScript execution environments from sensitive systems
- Implement strict input validation for all JavaScript code processed by JerryScript
🔍 How to Verify
Check if Vulnerable:
Check JerryScript version with 'jerry --version' or examine application dependencies for JerryScript <=2.3.0Check Version:
jerry --versionVerify Fix Applied:
Verify JerryScript version is 2.4.0 or later and test with known proof-of-concept code📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected termination of JerryScript processes
Network Indicators:
- Unusual JavaScript payloads containing function({a=arguments}) patterns
SIEM Query:
Process termination where process_name contains 'jerry' AND exit_code indicates memory violation