CVE-2021-30455 : What You Need to Know

An issue was discovered in the id-map crate through 2021-02-26 for Rust, where a double free can occur in IdMap::clone_from upon a .clone panic.

Understanding CVE-2021-30455

This CVE highlights a vulnerability found in the id-map crate in Rust that can lead to a double free scenario.

What is CVE-2021-30455?

CVE-2021-30455 represents a flaw in the id-map crate of Rust which triggers a double free situation during a .clone panic.

The Impact of CVE-2021-30455

The impact of CVE-2021-30455 could allow attackers to exploit the double free vulnerability, potentially leading to a denial of service or arbitrary code execution.

Technical Details of CVE-2021-30455

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in the id-map crate can be exploited to trigger a double free, specifically in the IdMap::clone_from function post a .clone panic.

Affected Systems and Versions

The affected systems include all versions of the id-map crate through 2021-02-26 for Rust that do not have the patch addressing the double free issue.

Exploitation Mechanism

By inducing a .clone panic in the IdMap::clone_from function, an attacker can cause a double free scenario, potentially leading to further exploitation.

Mitigation and Prevention

Here we discuss the steps to mitigate and prevent the exploitation of CVE-2021-30455.

Immediate Steps to Take

Developers are advised to update the id-map crate to a patched version that resolves the double free vulnerability.

Long-Term Security Practices

Implementing secure coding practices and regular code review can help in preventing such memory-related vulnerabilities in the future.

Patching and Updates

Stay updated with the latest patches and security advisories for Rust crates to ensure vulnerabilities like double free scenarios are addressed promptly.