CVE-2021-46334
📋 TL;DR
CVE-2021-46334 is a stack buffer overflow vulnerability in Moddable SDK v11.5.0 that occurs via the __interceptor_strcat component. This vulnerability allows attackers to execute arbitrary code or cause denial of service by exploiting improper bounds checking. It affects any systems running vulnerable versions of Moddable SDK.
💻 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 crash causing denial of service, potentially leading to data corruption or service disruption.
If Mitigated
Application crash with limited impact due to sandboxing or privilege separation.
🎯 Exploit Status
Exploitation requires specific conditions where attacker-controlled input reaches the vulnerable function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v11.5.1 or later
Vendor Advisory: https://github.com/Moddable-OpenSource/moddable/issues/760
Restart Required: Yes
Instructions:
1. Update Moddable SDK to version 11.5.1 or later. 2. Rebuild and redeploy all applications using the SDK. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation and bounds checking for all string operations.
Disable Vulnerable Component
allAvoid using or disable the __interceptor_strcat component if possible.
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems.
- Deploy runtime application self-protection (RASP) or similar controls.
🔍 How to Verify
Check if Vulnerable:
Check if Moddable SDK version is 11.5.0 by examining package metadata or build configuration.Check Version:
Check build configuration files or package manager for Moddable SDK version.Verify Fix Applied:
Verify Moddable SDK version is 11.5.1 or later and applications have been rebuilt with the updated SDK.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unusual memory access patterns
Network Indicators:
- Unexpected network connections from application process
SIEM Query:
Process termination events with exit code indicating segmentation fault (SIGSEGV)