CVE-2021-45681
📋 TL;DR
This vulnerability in the derive-com-impl Rust crate allows memory corruption due to improper reference counting. Attackers could potentially execute arbitrary code or cause denial of service by exploiting invalid pointer references. Users of applications built with vulnerable versions of this crate are affected.
💻 Affected Systems
- derive-com-impl Rust crate
📦 What is this software?
Derive Com Impl by Derive Com Impl 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 unstable behavior.
If Mitigated
Limited impact with proper memory protections and exploit mitigations in place.
🎯 Exploit Status
Exploitation requires specific conditions where AddRef is not called before pointer return, making reliable exploitation non-trivial.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.2 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0083.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require derive-com-impl >=0.1.2
2. Run 'cargo update derive-com-impl'
3. Rebuild and redeploy affected applications
4. Restart services using the updated applications
🔧 Temporary Workarounds
Remove or replace dependency
allRemove derive-com-impl dependency or replace with alternative implementation
cargo remove derive-com-impl
Edit Cargo.toml to remove derive-com-impl dependency
🧯 If You Can't Patch
- Isolate affected applications in network segments with limited access
- Implement strict input validation and memory protection mechanisms
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep derive-com-impl' to see if version <0.1.2 is usedCheck Version:
grep derive-com-impl Cargo.lockVerify Fix Applied:
Verify Cargo.lock shows derive-com-impl version 0.1.2 or higher📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Segmentation faults in Rust applications
- Unexpected process termination
Network Indicators:
- Unusual outbound connections from affected applications
- Traffic patterns indicating exploitation attempts
SIEM Query:
process.name: "rust_application" AND (event.type: "crash" OR event.type: "segfault")🔗 References
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/derive-com-impl/RUSTSEC-2021-0083.md
- https://rustsec.org/advisories/RUSTSEC-2021-0083.html
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/derive-com-impl/RUSTSEC-2021-0083.md
- https://rustsec.org/advisories/RUSTSEC-2021-0083.html
