CVE-2021-29933
📋 TL;DR
This vulnerability in the insert_many Rust crate allows double-free memory corruption when the .next() method panics, potentially leading to use-after-free conditions. It affects Rust applications using insert_many crate versions through 2021-01-26.
💻 Affected Systems
- insert_many Rust crate
📦 What is this software?
Insert Many by Insert Many Project
⚠️ Risk & Real-World Impact
Worst Case
Arbitrary code execution via memory corruption leading to complete system compromise.
Likely Case
Application crashes, denial of service, or memory corruption leading to data corruption.
If Mitigated
Application crash with no data loss if proper memory safety controls are in place.
🎯 Exploit Status
Exploitation requires triggering a panic in specific code paths, making it somewhat complex but feasible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2021-01-26
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0042.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to use insert_many version >0.4.1. 2. Run 'cargo update'. 3. Rebuild and redeploy application.
🔧 Temporary Workarounds
Avoid panic conditions
allModify code to avoid panic conditions when using insert_many .next() method
Use alternative crate
allReplace insert_many with alternative collection manipulation crates
🧯 If You Can't Patch
- Implement panic handlers to catch and safely handle .next() method panics
- Isolate affected applications in containers with limited permissions
🔍 How to Verify
Check if Vulnerable:
Check Cargo.toml for insert_many dependency version <=0.4.1Check Version:
grep insert_many Cargo.tomlVerify Fix Applied:
Verify Cargo.toml shows insert_many version >0.4.1 and run 'cargo tree' to confirm📡 Detection & Monitoring
Log Indicators:
- Application crashes with double-free errors
- Panic backtraces involving insert_many
Network Indicators:
- Sudden application termination without normal shutdown
SIEM Query:
process.name:rust_app AND (event.type:crash OR log.message:"double free" OR log.message:"insert_many")