CVE-2020-36449
📋 TL;DR
This vulnerability in the kekbit Rust crate allows data races and memory corruption when ShmWriter objects are sent between threads without proper synchronization. It affects Rust applications using kekbit versions before 0.3.4 for shared memory communication. The issue stems from incorrect Send trait implementation that doesn't enforce thread safety requirements.
💻 Affected Systems
- kekbit Rust crate
📦 What is this software?
Kekbit by Kekbit Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, denial of service, or data integrity compromise in multi-threaded Rust applications using shared memory communication.
Likely Case
Data races causing application crashes, undefined behavior, or incorrect program execution in multi-threaded environments.
If Mitigated
Minimal impact if applications don't use multi-threading with ShmWriter or have additional synchronization mechanisms.
🎯 Exploit Status
Exploitation requires multi-threaded Rust application using vulnerable kekbit crate and attacker ability to influence shared memory operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.4 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0129.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify kekbit >= 0.3.4
2. Run 'cargo update kekbit'
3. Rebuild and redeploy application
4. Restart affected services
🔧 Temporary Workarounds
Avoid multi-threaded ShmWriter usage
allRefactor code to avoid sending ShmWriter objects between threads or use single-threaded execution for shared memory operations.
Add manual synchronization
allImplement custom synchronization mechanisms (Mutex, Arc) around ShmWriter usage to ensure thread safety.
🧯 If You Can't Patch
- Isolate vulnerable applications in containers or VMs with limited privileges
- Implement strict input validation and monitoring for shared memory operations
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or Cargo.toml for kekbit dependency version < 0.3.4Check Version:
grep kekbit Cargo.lock | grep versionVerify Fix Applied:
Verify kekbit version is >= 0.3.4 in Cargo.lock after update📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Memory access violations
- Thread panic messages in Rust applications
Network Indicators:
- Unusual process crashes in services using shared memory
SIEM Query:
process.name:rust AND (event.type:crash OR error.message:"memory corruption" OR error.message:"data race")