CVE-2020-35880
📋 TL;DR
This vulnerability in the Rust bigint crate allows memory safety violations through soundness issues, potentially leading to arbitrary code execution. It affects any Rust application using the vulnerable bigint crate versions. The high CVSS score indicates critical impact potential.
💻 Affected Systems
- Rust applications using bigint crate
📦 What is this software?
Bigint by Bigint 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 application runs with minimal privileges and proper sandboxing.
🎯 Exploit Status
Soundness violations in Rust typically require specific conditions to trigger but can be exploited via crafted inputs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2020-05-07
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0025.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to use bigint >=0.4.0. 2. Run 'cargo update'. 3. Rebuild and redeploy application. 4. Restart affected services.
🔧 Temporary Workarounds
Pin to safe version
allExplicitly specify non-vulnerable bigint version in Cargo.toml
bigint = ">=0.4.0"
🧯 If You Can't Patch
- Isolate vulnerable applications in network segments with strict egress filtering
- Implement application allowlisting and restrict execution privileges
🔍 How to Verify
Check if Vulnerable:
Run 'cargo tree | grep bigint' and check version. If version <=0.3.2, vulnerable.Check Version:
cargo tree | grep bigintVerify Fix Applied:
Run 'cargo tree | grep bigint' and confirm version >=0.4.0.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Unexpected segmentation faults
Network Indicators:
- Unusual outbound connections from Rust applications
SIEM Query:
process_name:rust AND (event_type:crash OR error_message:"memory corruption")