CVE-2021-30456
📋 TL;DR
This vulnerability in the id-map Rust crate allows double-free memory corruption when a user-provided function panics during get_or_insert operations. Attackers could exploit this to execute arbitrary code or cause denial of service. Any Rust application using vulnerable versions of the id-map crate is affected.
💻 Affected Systems
- id-map Rust crate
📦 What is this software?
Id Map by Id Map Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash or denial of service due to memory corruption, potentially leading to data loss.
If Mitigated
Limited impact with proper memory safety controls and exploit mitigations like ASLR and stack canaries.
🎯 Exploit Status
Exploitation requires triggering a panic in user-provided function, which may be controllable via crafted input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: id-map 0.4.0
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0052.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require id-map >= 0.4.0. 2. Run 'cargo update' to fetch the fixed version. 3. Rebuild and redeploy your application.
🔧 Temporary Workarounds
Avoid panic-prone functions
allModify code to avoid using user-provided functions that can panic with get_or_insert.
Use catch_unwind
allWrap calls to get_or_insert with std::panic::catch_unwind to prevent panics from propagating.
🧯 If You Can't Patch
- Isolate affected applications in containers or VMs with minimal privileges.
- Implement strict input validation to prevent triggering panic conditions.
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for id-map version <= 0.3.0 or run 'cargo tree | grep id-map'.Check Version:
grep id-map Cargo.lockVerify Fix Applied:
Verify id-map version >= 0.4.0 in Cargo.lock after update.📡 Detection & Monitoring
Log Indicators:
- Application crashes with double-free or memory corruption errors
- Unexpected panic messages in logs
Network Indicators:
- Unusual traffic patterns to services using id-map
SIEM Query:
source="application.logs" AND ("double free" OR "memory corruption" OR "panic")