CVE-2021-46332
📋 TL;DR
CVE-2021-46332 is a heap buffer overflow vulnerability in Moddable SDK's DataView implementation that allows attackers to read beyond allocated memory boundaries. This affects applications built with Moddable SDK v11.5.0 that use DataView functionality. Successful exploitation could lead to information disclosure, application crashes, or potentially remote code execution.
💻 Affected Systems
- Moddable SDK
📦 What is this software?
Moddable Sdk by Moddable
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Application crashes (denial of service) and potential information disclosure through memory leaks.
If Mitigated
Application crashes with no data compromise if proper memory protections are enabled.
🎯 Exploit Status
Exploitation requires crafting malicious DataView operations. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v11.5.1 and later
Vendor Advisory: https://github.com/Moddable-OpenSource/moddable/issues/749
Restart Required: Yes
Instructions:
1. Update Moddable SDK to v11.5.1 or later. 2. Rebuild all applications with the updated SDK. 3. Redeploy updated applications to affected devices.
🔧 Temporary Workarounds
Disable DataView Usage
allRemove or disable DataView functionality in applications if not required.
Modify application code to avoid DataView API calls
🧯 If You Can't Patch
- Implement strict input validation for DataView operations
- Deploy applications in sandboxed/isolated environments
🔍 How to Verify
Check if Vulnerable:
Check if application uses Moddable SDK v11.5.0 and uses DataView functionality.Check Version:
Check moddable SDK version in build configuration or package.jsonVerify Fix Applied:
Verify SDK version is v11.5.1 or later and rebuild applications.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected termination of Moddable applications
Network Indicators:
- Unusual network traffic from embedded devices running Moddable applications
SIEM Query:
Process termination events from Moddable applications OR memory violation alerts