CVE-2024-34251
📋 TL;DR
An out-of-bounds memory read vulnerability in Bytecode Alliance wasm-micro-runtime v2.0.0 allows remote attackers to cause denial of service by exploiting the block_type_get_arity function. This affects systems running WebAssembly modules through the vulnerable runtime. The vulnerability can be triggered remotely without authentication.
💻 Affected Systems
- Bytecode Alliance wasm-micro-runtime
📦 What is this software?
Webassembly Micro Runtime by Bytecodealliance
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption through denial of service, potentially leading to application crashes and unavailability.
Likely Case
Service instability and intermittent crashes affecting WebAssembly module execution.
If Mitigated
Minimal impact with proper input validation and runtime isolation in place.
🎯 Exploit Status
Exploitation requires crafting malicious WebAssembly modules to trigger the out-of-bounds read.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after v2.0.0
Vendor Advisory: https://github.com/bytecodealliance/wasm-micro-runtime/issues/3347
Restart Required: Yes
Instructions:
1. Check current wasm-micro-runtime version. 2. Update to latest version from official repository. 3. Recompile any applications using the runtime. 4. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict validation of WebAssembly modules before execution
Runtime Isolation
allRun wasm-micro-runtime in isolated containers or sandboxes
🧯 If You Can't Patch
- Implement network segmentation to limit access to vulnerable systems
- Deploy Web Application Firewall (WAF) rules to detect malicious WebAssembly payloads
🔍 How to Verify
Check if Vulnerable:
Check if wasm-micro-runtime version is exactly 2.0.0Check Version:
Check build configuration or runtime version outputVerify Fix Applied:
Verify version is updated to later than 2.0.0📡 Detection & Monitoring
Log Indicators:
- Unexpected runtime crashes
- Memory access violation errors
- WebAssembly module execution failures
Network Indicators:
- Unusual WebAssembly module uploads
- Repeated connection attempts to WebAssembly endpoints
SIEM Query:
source="wasm-runtime" AND (event="crash" OR event="memory_violation")