CVE-2021-27347 : Vulnerability Insights and Analysis

A detailed overview of CVE-2021-27347 focusing on the use after free vulnerability in Irzip 0.631 that allows attackers to cause Denial of Service (DoS) via a crafted compressed file.

Understanding CVE-2021-27347

This section will cover the vulnerability description, impact, affected systems, exploitation mechanism, mitigation steps, and preventive measures related to CVE-2021-27347.

What is CVE-2021-27347?

The CVE-2021-27347 refers to a use after free vulnerability in the lzma_decompress_buf function in stream.c in Irzip 0.631. This vulnerability enables attackers to trigger a Denial of Service (DoS) attack by exploiting a specifically crafted compressed file.

The Impact of CVE-2021-27347

The impact of this vulnerability is severe as it allows malicious actors to remotely execute a DoS attack by leveraging the use after free flaw in the Irzip compression library.

Technical Details of CVE-2021-27347

In this section, we will delve into the technical specifics of CVE-2021-27347 to understand the vulnerability, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability stems from a use after free issue in the lzma_decompress_buf function within the Irzip 0.631 library, allowing threat actors to create a DoS scenario through a meticulously crafted compressed file.

Affected Systems and Versions

The affected systems include all instances utilizing Irzip 0.631. The particular version with the vulnerability is prone to exploitation, potentially leading to service disruption.

Exploitation Mechanism

To exploit this vulnerability, attackers would need to manipulate a compressed file in a way that triggers the use after free condition within the lzma_decompress_buf function of Irzip 0.631.

Mitigation and Prevention

This section focuses on the immediate steps to take to safeguard systems, long-term security practices, and the importance of applying patches and updates.

Immediate Steps to Take

It is recommended to update Irzip to a patched version immediately to mitigate the risk associated with CVE-2021-27347. Furthermore, avoid opening compressed files from untrusted sources.

Long-Term Security Practices

In the long term, implementing secure coding practices, conducting regular security audits, and educating users on safe file handling can help prevent similar vulnerabilities.

Patching and Updates

Developers should monitor security advisories, apply patches promptly, and ensure that all software dependencies are up to date to prevent potential exploitation of known vulnerabilities.