CVE-2020-36454
📋 TL;DR
This vulnerability in the parc Rust crate allows data races and memory corruption by enabling unsafe concurrent access across threads. It affects any Rust application using parc versions through 2020-11-14 that shares LockWeak<T> objects between threads where T isn't thread-safe.
💻 Affected Systems
- parc Rust crate
📦 What is this software?
Parc by Parc Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, denial of service, or data integrity compromise.
Likely Case
Data races causing undefined behavior, crashes, or incorrect program output.
If Mitigated
Limited impact if applications don't share LockWeak<T> across threads or use proper synchronization.
🎯 Exploit Status
Exploitation requires specific application patterns and understanding of Rust's concurrency model.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 0.1.1 or later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0134.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify parc >= 0.1.1
2. Run 'cargo update --package parc'
3. Rebuild and redeploy application
4. Test thoroughly for compatibility issues
🔧 Temporary Workarounds
Avoid cross-thread LockWeak sharing
allEnsure LockWeak<T> objects are not sent between threads unless T implements Send
Use alternative synchronization
allReplace parc with thread-safe alternatives like Arc<Mutex<T>> or Arc<RwLock<T>>
🧯 If You Can't Patch
- Audit code for cross-thread LockWeak<T> usage and add manual synchronization
- Implement runtime checks to prevent unsafe thread transfers
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for parc version <= 0.1.0 or check dependency tree with 'cargo tree | grep parc'Check Version:
grep -A2 -B2 'parc' Cargo.lock | grep versionVerify Fix Applied:
Confirm parc version >= 0.1.1 in Cargo.lock and run 'cargo audit' to verify no RUSTSEC-2020-0134 warnings📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Unexpected thread panics
- Memory access violation errors
Network Indicators:
- Service crashes under concurrent load
- Unusual memory usage patterns
SIEM Query:
process.name:rust-app AND (event.type:crash OR event.type:panic)