CVE-2021-29935 : What You Need to Know

An issue was discovered in the rocket crate before 0.4.7 for Rust. The uri::Formatter component can experience a use-after-free vulnerability when a user-provided function panics.

Understanding CVE-2021-29935

This CVE describes a vulnerability in the rocket crate for Rust that could lead to a use-after-free issue.

What is CVE-2021-29935?

CVE-2021-29935 is a vulnerability found in the rocket crate before version 0.4.7 for Rust. It specifically affects the uri::Formatter component and arises when a user-provided function panics, leading to a use-after-free scenario.

The Impact of CVE-2021-29935

Exploitation of this vulnerability could potentially allow an attacker to execute arbitrary code or cause a denial of service (DoS) condition on systems running the affected version of the rocket crate.

Technical Details of CVE-2021-29935

This section covers specific technical details of the CVE.

Vulnerability Description

The vulnerability involves a use-after-free issue in the uri::Formatter component when a user-provided function panics, potentially leading to a security exploit.

Affected Systems and Versions

The vulnerability affects versions of the rocket crate prior to 0.4.7 for Rust.

Exploitation Mechanism

An attacker could exploit this vulnerability by triggering the use-after-free condition in the uri::Formatter component through specially crafted inputs.

Mitigation and Prevention

Here are the steps to mitigate and prevent exploitation of CVE-2021-29935.

Immediate Steps to Take

Update the rocket crate to version 0.4.7 or later to address this vulnerability.
Avoid running untrusted code or applications that may trigger the use-after-free condition.

Long-Term Security Practices

Follow best practices for secure coding to minimize the risk of similar vulnerabilities in the future.
Regularly monitor for updates and security advisories related to the rocket crate and Rust programming language.

Patching and Updates

Stay informed about security patches and updates for the rocket crate to ensure that known vulnerabilities are promptly addressed.