CVE-2025-48752: Process-sync Race Condition Vulnerability

CVE-2025-48752 Overview

A use-after-free vulnerability exists in the process-sync crate version 0.2.2 for Rust. The vulnerability stems from the drop function lacking a check for whether the pthread_mutex is unlocked before freeing associated memory. This flaw can lead to memory corruption, potentially enabling remote attackers to compromise the confidentiality, integrity, and availability of systems utilizing this synchronization library.

Critical Impact

Successful exploitation of this use-after-free vulnerability could allow attackers to execute arbitrary code, cause denial of service, or gain unauthorized access to sensitive data through memory corruption techniques.

Affected Products

• forestryks process-sync version 0.2.2
• Rust applications utilizing the process-sync crate for inter-process synchronization
• Any software dependent on process-sync for mutex operations

Discovery Timeline

• 2025-05-24 - CVE-2025-48752 published to NVD
• 2026-01-30 - Last updated in NVD database

Technical Details for CVE-2025-48752

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory safety issue that occurs when the application continues to use a pointer after the memory it references has been freed. In the context of the process-sync crate, the drop function—which is Rust's destructor mechanism—fails to verify whether the underlying pthread_mutex is in an unlocked state before proceeding with memory deallocation.

When a mutex is destroyed while still locked, the behavior is undefined according to POSIX standards. This can lead to scenarios where other threads or processes that hold references to the mutex may attempt to access memory that has been freed, resulting in use-after-free conditions.

Root Cause

The root cause lies in the improper implementation of the drop trait for mutex-related structures in the process-sync crate. The destructor does not perform a prerequisite check to ensure the pthread_mutex is unlocked before calling destruction routines. This oversight violates safe memory management practices and can result in undefined behavior when the mutex is dropped while still held by a thread.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker could potentially trigger the vulnerability by:

1. Causing a race condition where one thread drops the mutex while another thread still holds the lock
2. Exploiting improper error handling that leads to premature destruction of locked mutexes
3. Manipulating program flow to reach the vulnerable drop code path while the mutex remains locked

The use-after-free condition could then be leveraged to corrupt memory structures, potentially leading to arbitrary code execution or denial of service.

The vulnerability manifests in the drop function implementation for mutex handling within the process-sync crate. The missing unlock state verification before mutex destruction creates the unsafe condition. For technical details and discussion, see the GitHub Issue Tracker Discussion.

Detection Methods for CVE-2025-48752

Indicators of Compromise

• Unexpected application crashes with memory corruption-related error messages in processes using process-sync
• Segmentation faults or access violations in Rust applications utilizing inter-process synchronization
• Anomalous memory access patterns detected in application logs or system monitoring

Detection Strategies

• Audit Cargo.toml and Cargo.lock files to identify dependencies on process-sync version 0.2.2
• Implement runtime memory sanitizers (AddressSanitizer) during development and testing to detect use-after-free conditions
• Monitor for crash reports indicating double-free or use-after-free patterns in mutex-related code paths
• Use cargo audit to scan for known vulnerabilities in Rust project dependencies

Monitoring Recommendations

• Enable enhanced logging for mutex operations in production applications
• Deploy application performance monitoring (APM) solutions to detect abnormal memory usage patterns
• Implement crash reporting systems that capture stack traces and memory state for forensic analysis
• Monitor system logs for unexpected termination of processes using the affected crate

How to Mitigate CVE-2025-48752

Immediate Actions Required

• Identify all applications and services using the process-sync crate version 0.2.2 through dependency auditing
• Review the GitHub Issue Tracker Discussion for the latest security guidance and potential patches
• Consider replacing process-sync with alternative synchronization primitives from well-maintained crates
• Implement additional defensive checks in application code that uses mutex operations

Patch Information

Check the Process Sync Documentation on crates.io for the latest version information and any security updates. Review the GitHub repository for patch status and community-provided fixes.

Workarounds

• Implement wrapper functions around mutex operations that explicitly verify unlock state before dropping
• Use Rust's standard library synchronization primitives (std::sync::Mutex) as an alternative where inter-process synchronization is not strictly required
• Apply process isolation and sandboxing techniques to limit the impact of potential exploitation
• Consider forking the crate and applying manual fixes to the drop implementation until an official patch is available

# Check for vulnerable dependency in Rust project
cargo tree -p process-sync

# Audit dependencies for known vulnerabilities
cargo audit

# Update Cargo.lock to exclude vulnerable version (if patched version available)
cargo update -p process-sync