CVE-2020-36206
📋 TL;DR
This vulnerability in the rusb crate for Rust allows data races and memory corruption due to missing Send and Sync trait bounds. It affects Rust applications using rusb versions before 0.7.0 for USB device communication. Attackers could exploit this to cause crashes or potentially execute arbitrary code.
💻 Affected Systems
- Rust applications using rusb crate
📦 What is this software?
Rusb by Rusb Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, system compromise, or complete application crash with data loss.
Likely Case
Application crashes, denial of service, or data corruption in USB communication handling.
If Mitigated
Minimal impact if proper memory safety practices and updated libraries are used.
🎯 Exploit Status
Exploitation requires triggering data races through concurrent USB operations, which may be challenging to achieve reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: rusb 0.7.0 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0098.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require rusb >= 0.7.0
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your application
4. Restart any running services using the updated application
🔧 Temporary Workarounds
Avoid concurrent USB operations
allImplement synchronization mechanisms to prevent concurrent access to USB devices
Use alternative USB library
allTemporarily switch to a different USB library while waiting to update rusb
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized USB device connections
- Isolate applications using rusb in containers or sandboxes to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep rusb' to see if rusb version < 0.7.0 is usedCheck Version:
grep rusb Cargo.lock | head -1Verify Fix Applied:
Verify rusb version is >= 0.7.0 in Cargo.lock after update📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Segmentation faults in USB-related code
Network Indicators:
- None - this is a local memory safety issue
SIEM Query:
Application logs containing 'segmentation fault', 'memory corruption', or 'rusb' with error codes