CVE-2024-35424
📋 TL;DR
CVE-2024-35424 is a segmentation violation vulnerability in vmir's WebAssembly parser that can cause denial of service or potentially allow arbitrary code execution. This affects systems running vmir e8117 that process untrusted WebAssembly modules. The vulnerability occurs in the import_function function during WebAssembly module parsing.
💻 Affected Systems
- vmir
📦 What is this software?
Vmir by Lonelycoder
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the segmentation violation can be weaponized to execute arbitrary code.
Likely Case
Denial of service causing the vmir process to crash when processing malicious WebAssembly modules.
If Mitigated
Limited impact with proper input validation and sandboxing of WebAssembly execution environments.
🎯 Exploit Status
Proof of concept available in GitHub issue. Exploitation requires ability to supply malicious WebAssembly modules to vmir.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub repository for latest fixes
Vendor Advisory: https://github.com/andoma/vmir/issues/21
Restart Required: Yes
Instructions:
1. Check vmir GitHub repository for security updates. 2. Update to latest version. 3. Recompile if using source. 4. Restart any services using vmir.
🔧 Temporary Workarounds
Input Validation
allImplement strict validation of WebAssembly modules before passing to vmir parser
Sandbox Execution
linuxRun vmir in isolated containers or sandboxes to limit impact of crashes
docker run --security-opt=no-new-privileges -it vmir-container
🧯 If You Can't Patch
- Restrict vmir to process only trusted, pre-validated WebAssembly modules
- Implement network segmentation to isolate vmir instances from critical systems
🔍 How to Verify
Check if Vulnerable:
Check if running vmir e8117 or earlier versions. Test with known malicious WebAssembly modules from proof of concept.Check Version:
vmir --version or check build/compilation metadataVerify Fix Applied:
Test with the same malicious WebAssembly modules that previously caused crashes. Verify vmir processes them without segmentation faults.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in system logs
- vmir process crashes
- Core dumps from vmir process
Network Indicators:
- Unusual WebAssembly module uploads to vmir endpoints
- Repeated connection attempts to vmir services
SIEM Query:
process_name:vmir AND (event_type:crash OR error_message:"segmentation fault")