CVE-2021-30456 Explained : Impact and Mitigation

An issue was discovered in the id-map crate through 2021-02-26 for Rust, leading to a double free vulnerability in the get_or_insert function upon a panic of a user-provided f function.

Understanding CVE-2021-30456

This CVE refers to a vulnerability discovered in the id-map crate for Rust, which could potentially be exploited to cause a double free scenario.

What is CVE-2021-30456?

CVE-2021-30456 is a vulnerability identified in the id-map crate for Rust, allowing a double free to occur in the get_or_insert function when a user-provided f function panics.

The Impact of CVE-2021-30456

This vulnerability could be exploited by an attacker to potentially execute arbitrary code or cause a denial of service by triggering a double free scenario in the affected Rust application.

Technical Details of CVE-2021-30456

The technical details of CVE-2021-30456 include the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the id-map crate through 2021-02-26 for Rust allows a double free to occur in the get_or_insert function upon a panic of a user-provided f function.

Affected Systems and Versions

The affected systems include Rust applications utilizing the id-map crate up to the specified date of 2021-02-26.

Exploitation Mechanism

Exploitation of this vulnerability involves triggering a panic in a user-provided f function, leading to the occurrence of a double free in the get_or_insert function.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-30456, immediate steps should be taken followed by the establishment of long-term security practices.

Immediate Steps to Take

Immediately update the id-map crate in affected Rust applications to the latest patched version to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about updates and security advisories related to the Rust ecosystem.

Patching and Updates

Regularly monitor for patches and updates for the id-map crate and other dependencies in Rust projects to address security vulnerabilities and enhance overall application security.