CVE-2024-33258
📋 TL;DR
CVE-2024-33258 is a memory corruption vulnerability in JerryScript's JavaScript engine that allows attackers to cause segmentation faults via specially crafted scripts. This affects any application or device using vulnerable versions of JerryScript for JavaScript execution. The vulnerability could lead to denial of service or potentially arbitrary code execution.
💻 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
Remote code execution leading to complete system compromise if the segmentation violation can be weaponized into memory corruption exploits.
Likely Case
Denial of service through application crashes when processing malicious JavaScript input.
If Mitigated
Limited impact if proper input validation and sandboxing are implemented around JerryScript execution.
🎯 Exploit Status
Exploitation requires delivering malicious JavaScript to the JerryScript engine, which could be done through various attack vectors depending on implementation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: JerryScript after commit ff9ff8f
Vendor Advisory: https://github.com/jerryscript-project/jerryscript/issues/5114
Restart Required: Yes
Instructions:
1. Update JerryScript to version after commit ff9ff8f. 2. Rebuild any applications using JerryScript. 3. Restart affected services or devices. 4. Verify the fix by checking the JerryScript version.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation for JavaScript code processed by JerryScript to prevent malicious payloads.
Sandbox Execution
allRun JerryScript in isolated containers or sandboxes to limit impact of potential crashes or exploits.
🧯 If You Can't Patch
- Implement network segmentation to isolate devices running vulnerable JerryScript versions
- Deploy application firewalls or WAFs to filter malicious JavaScript input
🔍 How to Verify
Check if Vulnerable:
Check JerryScript version or commit hash. If using commit before ff9ff8f, the system is vulnerable.Check Version:
Check build configuration or run application with JerryScript to output version informationVerify Fix Applied:
Verify JerryScript is using commit ff9ff8f or later by checking version information.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected JerryScript process termination
- Memory access violation errors
Network Indicators:
- Unusual JavaScript payloads being sent to JerryScript endpoints
- Repeated connection attempts to JerryScript interfaces
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "segfault" OR "SIGSEGV") AND process="jerryscript"