CVE-2024-35422
📋 TL;DR
CVE-2024-35422 is a heap buffer overflow vulnerability in vmir's WebAssembly parser that allows attackers to execute arbitrary code or cause denial of service. This affects systems running vulnerable versions of vmir that process untrusted WebAssembly modules. The vulnerability is exploitable remotely if vmir is exposed to untrusted inputs.
💻 Affected Systems
- vmir
📦 What is this software?
Vmir by Lonelycoder
⚠️ 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, potentially leading to service disruption.
If Mitigated
Limited impact if proper input validation and memory protections are in place, though crashes may still occur.
🎯 Exploit Status
The GitHub issue includes technical details that could facilitate exploitation. Heap buffer overflows typically require some skill to weaponize reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check GitHub issue #23 for updates
Vendor Advisory: https://github.com/andoma/vmir/issues/23
Restart Required: Yes
Instructions:
1. Monitor GitHub issue #23 for patch release. 2. Update vmir to the patched version when available. 3. Restart any vmir processes or services.
🔧 Temporary Workarounds
Disable WebAssembly Processing
allPrevent vmir from processing WebAssembly modules if not required.
Configure vmir to reject WebAssembly inputs or disable wasm functionality
Input Validation
allImplement strict validation of WebAssembly modules before processing.
Add pre-processing checks for WebAssembly module size and structure
🧯 If You Can't Patch
- Isolate vmir instances in restricted network segments with no internet access.
- Implement strict access controls to limit who can submit WebAssembly modules to vmir.
🔍 How to Verify
Check if Vulnerable:
Check vmir version and compare against patched version when available. Test with proof-of-concept from GitHub references.Check Version:
vmir --version or check build/installation metadataVerify Fix Applied:
Update to patched version and test with the same proof-of-concept to ensure no crash occurs.📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Memory access violation errors
- Unexpected vmir process termination
Network Indicators:
- Unusual WebAssembly module submissions
- Large or malformed WebAssembly payloads
SIEM Query:
process_name:vmir AND (event_type:crash OR error_message:"segmentation fault" OR error_message:"buffer overflow")