CVE-2021-29929
📋 TL;DR
This vulnerability in the endian_trait Rust crate allows double-free memory corruption when a user-provided Endian implementation panics. This affects Rust applications using vulnerable versions of the endian_trait crate, potentially leading to crashes or arbitrary code execution.
💻 Affected Systems
- Rust applications using endian_trait crate
📦 What is this software?
Endian Trait by Endian Trait Project
⚠️ Risk & Real-World Impact
Worst Case
Arbitrary code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash causing denial of service and potential data corruption.
If Mitigated
Application crash with limited impact due to proper sandboxing and privilege separation.
🎯 Exploit Status
Exploitation requires triggering a panic in user-provided Endian implementation, making reliable exploitation challenging.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: endian_trait 0.2.0
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0039.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify endian_trait >= 0.2.0
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your application
🔧 Temporary Workarounds
Avoid custom Endian implementations
allRemove or avoid using custom Endian trait implementations that could panic
🧯 If You Can't Patch
- Implement input validation to prevent triggering panics in Endian implementations
- Run application with memory safety mitigations like ASLR and stack canaries
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for endian_trait version <= 0.1.0 or run 'cargo audit'Check Version:
grep endian_trait Cargo.lockVerify Fix Applied:
Verify Cargo.lock shows endian_trait >= 0.2.0 and 'cargo audit' reports no vulnerabilities📡 Detection & Monitoring
Log Indicators:
- Application crashes with double-free or memory corruption errors
- Unexpected panics in Endian trait implementations
Network Indicators:
- Sudden application unavailability or restart patterns
SIEM Query:
process.name:your_rust_app AND (event.type:crash OR error.message:"double free" OR error.message:panic)