CVE-2021-25904
📋 TL;DR
This vulnerability in the av-data Rust crate allows dereferencing of raw pointers, potentially reading arbitrary memory addresses. This can cause segmentation faults or expose sensitive memory contents. Any Rust application using av-data versions before 0.3.0 is affected.
💻 Affected Systems
- av-data Rust crate
📦 What is this software?
Av Data by Av Data Project
⚠️ Risk & Real-World Impact
Worst Case
Arbitrary memory read could expose sensitive data like encryption keys, credentials, or application secrets, potentially leading to full system compromise.
Likely Case
Application crashes (segfaults) causing denial of service and potential information disclosure through memory dumps.
If Mitigated
With proper memory protection and ASLR, impact limited to application crashes without data exposure.
🎯 Exploit Status
Exploitation requires triggering specific code paths that dereference the raw pointer. No public exploit code has been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.0 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0007.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify av-data >= 0.3.0
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your application
4. Restart any running services using the updated application
🔧 Temporary Workarounds
Remove av-data dependency
allIf av-data is not essential, remove it from your Cargo.toml and refactor code to eliminate its usage.
Remove 'av-data' line from Cargo.toml dependencies
Run 'cargo build' to verify removal
🧯 If You Can't Patch
- Isolate affected applications in containers or VMs with minimal privileges
- Implement strict network controls to limit access to vulnerable services
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep av-data' to see if av-data < 0.3.0 is in your dependency tree.Check Version:
cargo tree | grep av-dataVerify Fix Applied:
Run 'cargo tree | grep av-data' and verify version is 0.3.0 or higher, then test application functionality.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors
- Application crashes with memory access violations
- Unexpected termination of Rust processes
Network Indicators:
- Sudden service unavailability
- Connection resets from affected services
SIEM Query:
process.name: "your_rust_app" AND (event.action: "segmentation_fault" OR event.outcome: "failure")