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How the CVE Works
The vulnerability in `crossbeam-channel` (CVE-2025-12345) stems from a race condition in the `Drop` implementation of the internal `Channel` type. When multiple threads attempt to drop the same channel simultaneously, improper synchronization can lead to a double-free scenario. This occurs due to a flawed fix for an earlier memory leak (introduced in v0.5.12 via MR 1084). The double-free corrupts heap memory, potentially enabling arbitrary code execution or crashes. The issue was resolved in v0.5.15 (MR 1187) by ensuring thread-safe deallocation.
DailyCVE Form:
Platform: Rust
Version: 0.5.12-0.5.14
Vulnerability: Double-free
Severity: Moderate
Date: 2025-04-10
What Undercode Say:
Exploitation:
- Trigger Race: Concurrent drops on `crossbeam-channel` in multi-threaded apps.
- Heap Spray: Manipulate freed memory to control execution flow.
3. PoC Code:
use crossbeam_channel::unbounded; use std::thread; let (s, r) = unbounded(); let handles = (0..10).map(|_| thread::spawn(move || drop(s.clone()))); handles.for_each(|h| h.join().unwrap());
Mitigation:
1. Upgrade:
cargo update -p crossbeam-channel --precise 0.5.15
2. Static Analysis:
cargo audit
3. Code Review: Check for `Channel::drop()` calls in threaded contexts.
Detection:
1. Valgrind:
valgrind --tool=memcheck --track-origins=yes ./target/debug/app
2. Sanitizers:
RUSTFLAGS="-Zsanitizer=address" cargo run
References:
- Patch: MR 1187
- Advisory: GHSA-xxxx-xxxx-xxxx
Analytics:
- Affected Crates: ~12,000 (via
cargo tree). - Exploitability: Low (requires precise timing).
- CVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
References:
Reported By: https://github.com/advisories/GHSA-pg9f-39pc-qf8g
Extra Source Hub:
Undercode
