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How the CVE Works
The vulnerability (CVE-2025-XXXXX) in `process-sync` crate v0.2.2 for Rust arises due to an improper implementation of the `drop` function for SharedMutex. The issue occurs when the destructor fails to verify whether the underlying `pthread_mutex` is unlocked before deallocation. This oversight can lead to undefined behavior if the mutex is still locked during cleanup, potentially causing memory corruption or thread deadlocks. Since Rust enforces strict safety guarantees, this unsound behavior violates Rust’s memory safety principles, even though it is marked as low severity due to limited real-world exploitability.
DailyCVE Form
Platform: Rust crate
Version: 0.2.2
Vulnerability: Unsafe drop()
Severity: Low
Date: May 24, 2025
Prediction: Patch by June 10, 2025
What Undercode Say:
Exploitation Analysis
- Triggering the bug requires a locked mutex during drop.
- May cause undefined behavior in multi-threaded applications.
- Exploitable via forced premature deallocation.
Protection & Mitigation
- Manual Fix: Modify `drop()` to check lock state.
impl Drop for SharedMutex { fn drop(&mut self) { unsafe { if pthread_mutex_trylock(&self.mutex) == 0 { pthread_mutex_unlock(&self.mutex); } pthread_mutex_destroy(&self.mutex); } } }
2. Workaround: Avoid manual mutex management.
3. Upgrade: Await patched version (≥0.2.3).
Detection Commands
- Check dependency version:
cargo tree | grep process-sync
- Audit Rust crates:
cargo audit
Exploit Code (PoC)
use process_sync::SharedMutex;
fn main() {
let mtx = SharedMutex::new();
let _guard = mtx.lock().unwrap();
// Unsound drop while locked
}
Expected Patch
- GitHub advisory update.
- Crate re-release with lock validation.
- RustSec database entry.
Analytics
- Impact: Low (rare deadlock scenarios).
- Exploit Complexity: Medium (requires race condition).
- Affected Users: Rust multi-threaded apps.
Mitigation Priority
- Criticality: Low-priority update.
- Action: Monitor for crate patch.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
