CVE-2020-35882
📋 TL;DR
This vulnerability in the Rocket web framework for Rust allows creating multiple mutable references to the same object, potentially causing data races. It affects Rust applications using Rocket versions before 0.4.5. The issue could lead to memory corruption or unexpected behavior in concurrent environments.
💻 Affected Systems
- Rocket web framework for Rust
📦 What is this software?
Rocket by Rocket
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to application crashes, data corruption, or potential remote code execution in worst-case scenarios with unsafe code usage.
Likely Case
Application instability, crashes, or data corruption in multi-threaded environments when LocalRequest::clone is used.
If Mitigated
Minimal impact if proper thread safety practices are followed and the vulnerable function is avoided.
🎯 Exploit Status
Exploitation requires specific conditions where LocalRequest::clone is used in concurrent contexts. No public exploits have been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.4.5 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0028.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify rocket = "^0.4.5" or later. 2. Run 'cargo update' to fetch the patched version. 3. Rebuild and redeploy your application.
🔧 Temporary Workarounds
Avoid LocalRequest::clone
allRefactor code to avoid using the LocalRequest::clone method entirely
🧯 If You Can't Patch
- Implement additional synchronization mechanisms around LocalRequest usage
- Isolate vulnerable components and implement strict access controls
🔍 How to Verify
Check if Vulnerable:
Check Cargo.toml or Cargo.lock for rocket dependency version below 0.4.5Check Version:
grep rocket Cargo.lockVerify Fix Applied:
Verify rocket version is 0.4.5 or higher in Cargo.lock after update📡 Detection & Monitoring
Log Indicators:
- Application crashes, segmentation faults, or memory access errors in logs
Network Indicators:
- Unusual application behavior or service interruptions
SIEM Query:
Application logs containing 'segmentation fault', 'memory corruption', or 'data race' errors