CVE-2021-29936
📋 TL;DR
This vulnerability in the adtensor Rust crate allows attackers to trigger use of uninitialized memory through the FromIterator implementation for Vector and Matrix types. This can lead to memory corruption, crashes, or potential code execution. Any Rust application using vulnerable versions of the adtensor crate is affected.
💻 Affected Systems
- adtensor Rust crate
📦 What is this software?
Adtensor by Adtensor 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
Application crashes without code execution if memory protections are enabled.
🎯 Exploit Status
Exploitation requires crafting specific inputs to trigger the uninitialized memory drop.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to adtensor crate version after 2021-01-11
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0045.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to use adtensor version > 0.1.0 (post-2021-01-11). 2. Run 'cargo update adtensor'. 3. Rebuild and redeploy your application.
🔧 Temporary Workarounds
Remove adtensor dependency
allTemporarily remove or replace the adtensor crate with alternative tensor libraries.
cargo remove adtensor
🧯 If You Can't Patch
- Isolate affected applications in network segments with strict egress filtering.
- Implement application-level input validation and sanitization for all tensor operations.
🔍 How to Verify
Check if Vulnerable:
Check Cargo.toml or Cargo.lock for adtensor dependency with version <= 0.1.0 (2021-01-11).Check Version:
grep adtensor Cargo.toml && grep -A2 -B2 adtensor Cargo.lockVerify Fix Applied:
Verify adtensor version in Cargo.lock is > 0.1.0 and no longer shows in 'cargo audit'.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Segmentation faults in Rust applications
Network Indicators:
- Unusual outbound connections from Rust applications post-crash
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption" OR "adtensor")