CVE-2020-35894
📋 TL;DR
This vulnerability in the Rust obstack crate allows unaligned memory references, which can lead to memory corruption and potential crashes. It affects Rust applications using obstack versions before 0.1.4. Developers using this crate in their Rust projects are primarily affected.
💻 Affected Systems
- obstack Rust crate
📦 What is this software?
Obstack by Obstack Project
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, denial of service, or data corruption in applications using the vulnerable obstack crate.
Likely Case
Application crashes, undefined behavior, or memory corruption errors when handling specific memory operations.
If Mitigated
No impact if using patched version or if application doesn't trigger the specific memory alignment conditions.
🎯 Exploit Status
Exploitation requires specific conditions to trigger unaligned memory references; no public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.4
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0040.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify obstack = "^0.1.4" or higher. 2. Run 'cargo update' to fetch the patched version. 3. Rebuild and redeploy your Rust application.
🔧 Temporary Workarounds
Pin to patched version
allForce dependency resolution to use patched version 0.1.4 or later
cargo update -p obstack
🧯 If You Can't Patch
- Remove or replace obstack dependency with alternative memory management crate
- Implement input validation and bounds checking around memory operations using obstack
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for obstack version <0.1.4 or run 'cargo tree | grep obstack'Check Version:
grep obstack Cargo.lock | head -1Verify Fix Applied:
Verify Cargo.lock shows obstack version 0.1.4 or higher after update📡 Detection & Monitoring
Log Indicators:
- Segmentation faults
- Memory access violation errors
- Unaligned memory access warnings
Network Indicators:
- None specific - this is a local memory corruption issue
SIEM Query:
Application logs containing 'segmentation fault', 'SIGSEGV', or 'unaligned' errors from Rust applications