CVE-2021-29938 : Security Advisory and Response

An issue was discovered in the slice-deque crate through 2021-02-19 for Rust, where a double drop can occur in SliceDeque::drain_filter upon a panic in a predicate function.

Understanding CVE-2021-29938

This section will delve into the details of CVE-2021-29938 and its implications.

What is CVE-2021-29938?

CVE-2021-29938 involves a vulnerability in the slice-deque crate for Rust, leading to a double drop scenario when a panic happens in a predicate function.

The Impact of CVE-2021-29938

The impact of this vulnerability is the potential occurrence of a double drop, which can result in unexpected behaviors and potentially be exploited by malicious actors.

Technical Details of CVE-2021-29938

In this section, we will explore the technical aspects of CVE-2021-29938.

Vulnerability Description

The vulnerability allows for a double drop situation in SliceDeque::drain_filter when a panic is triggered in a predicate function.

Affected Systems and Versions

The slice-deque crate through 2021-02-19 for Rust is affected by this vulnerability.

Exploitation Mechanism

The exploitation involves triggering a panic in a predicate function, leading to the occurrence of a double drop in SliceDeque::drain_filter.

Mitigation and Prevention

Here we will discuss the mitigation strategies to address CVE-2021-29938.

Immediate Steps to Take

Developers should update to a non-vulnerable version of the slice-deque crate and review code that could trigger panics in predicate functions.

Long-Term Security Practices

Implement robust error handling mechanisms and ensure panic-free execution in critical code paths.

Patching and Updates

Stay informed about security advisories and apply patches promptly to protect against known vulnerabilities.