CVE-2021-41736
📋 TL;DR
CVE-2021-41736 is a heap-buffer overflow vulnerability in Faust's realPropagate() function that allows attackers to execute arbitrary code or cause denial of service. This affects users of Faust v2.35.0 who process untrusted input through the affected function. The vulnerability is particularly dangerous because it can be triggered without authentication.
💻 Affected Systems
- Faust
📦 What is this software?
Faust by Grame
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service through application crashes or memory corruption leading to instability.
If Mitigated
Limited impact if proper input validation and memory protections are in place.
🎯 Exploit Status
The heap overflow is in a core function and can be triggered via crafted input to Faust applications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.35.1 and later
Vendor Advisory: https://github.com/grame-cncm/faust/issues/653
Restart Required: Yes
Instructions:
1. Update Faust to version 2.35.1 or later. 2. Recompile any Faust applications with the updated version. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for Faust applications to prevent malicious input from reaching the vulnerable function.
Memory Protection
linuxEnable ASLR and DEP/stack protection on systems to make exploitation more difficult.
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Isolate Faust applications in network segments with strict access controls.
- Monitor for abnormal memory usage or crashes in Faust processes.
🔍 How to Verify
Check if Vulnerable:
Check Faust version: faust --version. If output shows 2.35.0, the system is vulnerable.Check Version:
faust --versionVerify Fix Applied:
After updating, run faust --version to confirm version is 2.35.1 or later.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in Faust application logs
- Abnormal memory allocation patterns
Network Indicators:
- Unusual network traffic to Faust applications from unexpected sources
SIEM Query:
source="faust.log" AND ("segmentation fault" OR "heap overflow")