CVE-2021-33453 : Security Advisory and Response

An issue was discovered in lrzip version 0.641 where a use-after-free vulnerability exists in ucompthread() in stream.c:1538.

Understanding CVE-2021-33453

This CVE involves a use-after-free vulnerability in lrzip version 0.641, specifically in the ucompthread() function in stream.c.

What is CVE-2021-33453?

CVE-2021-33453 is a security vulnerability found in lrzip version 0.641, allowing attackers to potentially execute arbitrary code or cause a denial of service by triggering the use-after-free condition.

The Impact of CVE-2021-33453

The use-after-free vulnerability in ucompthread() could be exploited by attackers to manipulate memory and execute malicious code, posing a serious threat to the security and integrity of systems running the affected version of lrzip.

Technical Details of CVE-2021-33453

This section provides a detailed overview of the vulnerability.

Vulnerability Description

The vulnerability exists in the ucompthread() function in stream.c at line 1538 due to improper handling of memory.

Affected Systems and Versions

CVE-2021-33453 affects lrzip version 0.641.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious input to trigger the use-after-free condition in the ucompthread() function, potentially leading to code execution or denial of service.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-33453, users and administrators can take the following steps:

Immediate Steps to Take

Consider applying patches or updates provided by the vendor to address the vulnerability.
Monitor system logs for any suspicious activities that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Implement secure coding practices to prevent memory-related vulnerabilities in software development processes.
Regularly update and patch software to ensure known vulnerabilities are addressed promptly.

Patching and Updates

Ensure that lrzip is updated to a non-vulnerable version and follow best practices for secure software deployment.