CVE-2020-36460
📋 TL;DR
This vulnerability in the Rust model crate allows data races and memory corruption by incorrectly marking the Shared data structure as thread-safe (Send and Sync traits) regardless of its inner type. This affects Rust applications using the model crate version 0.1.0 through 0.1.2. Attackers could exploit this to cause undefined behavior, crashes, or potentially execute arbitrary code.
💻 Affected Systems
- Rust model crate
📦 What is this software?
Model by Model Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise through memory corruption and undefined behavior in multi-threaded Rust applications.
Likely Case
Application crashes, data corruption, or denial of service due to data races and memory safety violations in concurrent code.
If Mitigated
Limited impact if applications don't use Shared in multi-threaded contexts or have proper isolation controls.
🎯 Exploit Status
Exploitation requires understanding of Rust's concurrency model and targeting specific application patterns using Shared across threads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: model crate version 0.1.3 or later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0140.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require model >= 0.1.3
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your application
4. Restart any running services using the vulnerable crate
🔧 Temporary Workarounds
Avoid Shared in multi-threaded contexts
allManually ensure Shared data structure is not used across thread boundaries
# Code review to identify and restrict Shared usage to single threads
Use alternative synchronization primitives
allReplace Shared with properly synchronized alternatives like Arc<Mutex<T>>
// Replace: use model::Shared
// With: use std::sync::{Arc, Mutex}
🧯 If You Can't Patch
- Isolate affected applications in containers or VMs with limited privileges
- Implement network segmentation to limit blast radius if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for model crate version 0.1.0 through 0.1.2: grep -A2 -B2 'name = "model"' Cargo.lockCheck Version:
cargo tree | grep modelVerify Fix Applied:
Verify model crate version is 0.1.3 or later in Cargo.lock: grep 'model' Cargo.lock | grep 'version'📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Segmentation faults in Rust applications
- Thread panic messages related to data races
Network Indicators:
- Unusual outbound connections from Rust applications
- Increased error rates in application monitoring
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption" OR "thread panic") AND process="rust_app"