CVE-2020-35898
📋 TL;DR
This vulnerability in the actix-utils Rust crate allows obtaining multiple mutable references to the same data, violating Rust's memory safety guarantees. This can lead to use-after-free, data races, or other memory corruption issues. Any Rust application using actix-utils versions before 2.0.0 is affected.
💻 Affected Systems
- actix-utils Rust crate
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, or service disruption
Likely Case
Application crashes, memory corruption, or denial of service due to undefined behavior
If Mitigated
Limited impact if application runs with minimal privileges and proper sandboxing
🎯 Exploit Status
The vulnerability is in a fundamental memory safety primitive, making exploitation relatively straightforward for attackers familiar with Rust memory corruption
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.0
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0045.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require actix-utils >=2.0.0
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your application
🔧 Temporary Workarounds
Pin to safe version
allForce Cargo to use the patched version by specifying exact version in Cargo.toml
actix-utils = "2.0.0"
🧯 If You Can't Patch
- Isolate affected applications in network segments with strict egress filtering
- Implement runtime monitoring for memory corruption patterns and crash detection
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep actix-utils' to see if version <2.0.0 is presentCheck Version:
grep actix-utils Cargo.lockVerify Fix Applied:
Run 'cargo update' and verify actix-utils >=2.0.0 appears in Cargo.lock📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in Rust panic messages
Network Indicators:
- Unusual outbound connections from Rust application processes
SIEM Query:
process.name:"your_rust_app" AND (event.type:"crash" OR event.type:"segfault")