CVE-2021-28037
📋 TL;DR
This vulnerability in the internment crate for Rust allows data races that can lead to memory corruption due to improper Sync trait implementation. Any Rust application using internment crate versions before 0.4.2 is affected, potentially leading to crashes or arbitrary code execution.
💻 Affected Systems
- Rust applications using internment crate
📦 What is this software?
Internment by Internment Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, complete system compromise, or remote code execution in network-facing services.
Likely Case
Application crashes, data corruption, or denial of service due to memory safety violations.
If Mitigated
Limited impact if application runs with minimal privileges and doesn't handle sensitive data.
🎯 Exploit Status
Exploitation requires triggering data races in concurrent code using Intern<T>. Requires application-specific knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.4.2
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0036.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require 'internment = "^0.4.2"' 2. Run 'cargo update' 3. Rebuild and redeploy application 4. Restart affected services
🔧 Temporary Workarounds
Avoid concurrent usage
allPrevent data races by avoiding concurrent access to Intern<T> objects
Pin to safe version
allForce dependency resolution to safe version
cargo update -p internment --precise 0.4.2
🧯 If You Can't Patch
- Isolate affected applications in containers or VMs with minimal privileges
- Implement strict network segmentation to limit blast radius
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for 'internment' version <0.4.2 or run: cargo tree | grep internmentCheck Version:
grep -A2 'name = "internment"' Cargo.lockVerify Fix Applied:
Verify Cargo.lock shows internment version 0.4.2 or higher📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Memory access violations
- Unexpected application crashes
Network Indicators:
- Unusual outbound connections from Rust applications
SIEM Query:
process.name:"rust_app" AND (event.type:"crash" OR event.type:"segfault")