CVE-2020-35860
📋 TL;DR
This vulnerability in the cbox crate for Rust allows dereferencing raw pointers without unsafe code requirements, potentially leading to memory corruption. It affects Rust applications using vulnerable versions of the cbox crate. Attackers could exploit this to execute arbitrary code or crash applications.
💻 Affected Systems
- Rust applications using cbox crate
📦 What is this software?
Cbox by Cbox Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crashes (denial of service) or memory corruption leading to unpredictable behavior.
If Mitigated
Limited impact if proper memory safety controls and sandboxing are implemented.
🎯 Exploit Status
The vulnerability allows bypassing Rust's memory safety guarantees, making exploitation straightforward for attackers familiar with Rust memory management.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: cbox crate version after 2020-03-19
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0005.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to use cbox crate version >0.1.0 (post-2020-03-19). 2. Run 'cargo update' to fetch the patched version. 3. Recompile and redeploy your Rust application.
🔧 Temporary Workarounds
Remove cbox dependency
allEliminate the vulnerability by removing the cbox crate dependency from your project.
cargo remove cbox
Pin to patched version
allForce Cargo to use only patched versions of the cbox crate.
Add to Cargo.toml: cbox = ">0.1.0"
🧯 If You Can't Patch
- Isolate affected applications in network segments with strict firewall rules.
- Implement application sandboxing or containerization to limit potential damage from exploitation.
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for cbox crate version 0.1.0 or earlier, or run 'cargo audit' to detect vulnerable dependencies.Check Version:
grep -A2 'name = "cbox"' Cargo.lockVerify Fix Applied:
Verify Cargo.lock shows cbox crate version >0.1.0, and 'cargo audit' reports no vulnerabilities for cbox.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violation errors
- Unexpected segmentation faults in Rust applications
Network Indicators:
- Unusual outbound connections from Rust applications
- Traffic patterns suggesting exploit attempts
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption" OR "cbox")