CVE-2021-32810 : What You Need to Know

A data race vulnerability has been discovered in crossbeam-deque, affecting versions prior to 0.7.4 and 0.8.0. This vulnerability could result in tasks in the worker queue being popped twice, leading to memory leaks or logical bugs.

Understanding CVE-2021-32810

This section delves into the details of the CVE-2021-32810 vulnerability.

What is CVE-2021-32810?

crossbeam-deque, a package used for building task schedulers in Rust, is prone to a data race vulnerability in versions < 0.7.4 and >= 0.8.0, allowing tasks to be incorrectly processed, potentially leading to memory leaks or logical bugs.

The Impact of CVE-2021-32810

The impact of this vulnerability includes a high availability, confidentiality, and integrity impact with a CVSS base score of 9.8, categorizing it as a critical security issue. The vulnerability arises due to the improper handling of race conditions in shared resources.

Technical Details of CVE-2021-32810

This section provides a deeper insight into the technical aspects of the CVE-2021-32810 vulnerability.

Vulnerability Description

The vulnerability in crossbeam-deque allows multiple tasks in the worker queue to be popped twice due to a race condition, potentially causing memory leaks or logical bugs.

Affected Systems and Versions

Versions < 0.7.4 and >= 0.8.0, < 0.8.1 of crossbeam-deque are affected by this vulnerability, impacting systems utilizing the

Stealer::steal

,

Stealer::steal_batch

, or

Stealer::steal_batch_and_pop

functions.

Exploitation Mechanism

Exploiting this vulnerability requires specific knowledge of the affected functions and the ability to manipulate the worker queue to trigger the double-popping of tasks.

Mitigation and Prevention

This section outlines steps to mitigate and prevent the CVE-2021-32810 vulnerability in crossbeam-deque.

Immediate Steps to Take

Users are advised to update crossbeam-deque to version 0.7.4 or 0.8.1 to fix the data race issue. Additionally, review and refactor code utilizing the affected functions to prevent exploitation.

Long-Term Security Practices

Implement secure coding practices, regularly update dependencies, and conduct thorough code reviews to identify and address similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories from crossbeam-rs and promptly apply patches and updates to ensure the security of your Rust applications.