CVE-2025-64704
📋 TL;DR
This vulnerability in WebAssembly Micro Runtime (WAMR) allows a segmentation fault to be triggered via a specially crafted v128.store instruction in WebAssembly modules. This affects any application or service using WAMR versions before 2.4.4 to execute untrusted WebAssembly code. The vulnerability could lead to denial of service or potentially be leveraged for further exploitation.
💻 Affected Systems
- WebAssembly Micro Runtime (WAMR)
📦 What is this software?
Webassembly Micro Runtime by Bytecodealliance
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution if the segmentation fault can be weaponized with additional vulnerabilities, leading to complete system compromise.
Likely Case
Denial of service causing application crashes and service disruption when processing malicious WebAssembly modules.
If Mitigated
Minimal impact if only trusted WebAssembly modules are executed or if runtime isolation prevents privilege escalation.
🎯 Exploit Status
Exploitation requires crafting malicious WebAssembly modules with v128.store instructions. No public exploit code has been identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.4
Vendor Advisory: https://github.com/bytecodealliance/wasm-micro-runtime/security/advisories/GHSA-2f2p-wf5w-82qr
Restart Required: Yes
Instructions:
1. Download WAMR 2.4.4 from official repository. 2. Replace existing WAMR installation with patched version. 3. Recompile any applications using WAMR. 4. Restart services using WAMR runtime.
🔧 Temporary Workarounds
Disable untrusted WebAssembly execution
allConfigure applications to only execute trusted, validated WebAssembly modules
Runtime sandboxing
linuxRun WAMR in isolated containers or sandboxes to limit impact of crashes
docker run --security-opt no-new-privileges -d your_wamr_app
🧯 If You Can't Patch
- Implement strict input validation for WebAssembly modules before execution
- Deploy network segmentation to isolate WAMR instances from critical systems
🔍 How to Verify
Check if Vulnerable:
Check WAMR version with: wamrc --version or examine application dependenciesCheck Version:
wamrc --versionVerify Fix Applied:
Confirm version is 2.4.4 or higher and test with known malicious WebAssembly modules📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected WAMR process termination
- High frequency of WebAssembly module loading failures
Network Indicators:
- Unusual patterns of WebAssembly module uploads to affected services
- Increased error responses from WebAssembly execution endpoints
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "SIGSEGV") AND process="wamr"