CVE-2020-36436
📋 TL;DR
This vulnerability in the unicycle Rust crate allows data races and memory corruption when PinSlab<T> and Unordered<T, S> types are sent or shared between threads without proper synchronization. It affects Rust applications using unicycle versions before 0.7.1 that use these types in multi-threaded contexts.
💻 Affected Systems
- unicycle Rust crate
📦 What is this software?
Unicycle by Unicycle Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, denial of service, or data integrity compromise in multi-threaded applications.
Likely Case
Data races causing undefined behavior, crashes, or incorrect program output in concurrent Rust applications.
If Mitigated
Minimal impact if applications don't use affected types across threads or have other synchronization mechanisms.
🎯 Exploit Status
Exploitation requires understanding of Rust's concurrency model and specific usage patterns of the affected types.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.1 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0116.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify unicycle >= 0.7.1
2. Run 'cargo update --package unicycle'
3. Rebuild and redeploy your application
🔧 Temporary Workarounds
Avoid multi-threaded usage
allDo not use PinSlab<T> or Unordered<T, S> types across thread boundaries
Manual trait bounds
allAdd appropriate Send/Sync bounds in your code when using these types
🧯 If You Can't Patch
- Isolate affected components to single-threaded execution
- Implement additional synchronization wrappers around vulnerable types
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep unicycle' to see if version < 0.7.1 is usedCheck Version:
cargo tree | grep unicycleVerify Fix Applied:
Verify unicycle version is >= 0.7.1 in Cargo.lock after update📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Unexpected crashes in multi-threaded Rust applications
- Thread panic messages
Network Indicators:
- None specific - this is a local memory safety issue
SIEM Query:
Not applicable - local memory corruption vulnerability