CVE-2021-33797 : Vulnerability Insights and Analysis

A buffer-overflow vulnerability in Artifex MuJS versions 1.0.1 to 1.1.1 could allow an attacker to trigger a buffer overflow via an integer overflow in js_strtod() function.

Understanding CVE-2021-33797

This vulnerability affects the MuJS library, potentially leading to a buffer overflow due to an integer overflow in a specific function.

What is CVE-2021-33797?

The CVE-2021-33797 is a buffer-overflow vulnerability in the Artifex MuJS library versions 1.0.1 to 1.1.1, caused by an integer overflow in the js_strtod() function. This flaw could be exploited by an attacker to trigger a buffer overflow on the affected system.

The Impact of CVE-2021-33797

If successfully exploited, this vulnerability could allow a remote attacker to execute arbitrary code on the target system, potentially leading to a complete compromise of the system running the vulnerable MuJS library.

Technical Details of CVE-2021-33797

This section delves into the specifics of the vulnerability, including the description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from an integer overflow in the js_strtod() function within the Artifex MuJS library, leading to a buffer overflow in the *d pointer and allowing an attacker to execute arbitrary code.

Affected Systems and Versions

Artifex MuJS versions 1.0.1 to 1.1.1 are confirmed to be affected by this vulnerability. Systems utilizing these versions are at risk of exploitation.

Exploitation Mechanism

An attacker can exploit this vulnerability by crafting a malicious payload to trigger the integer overflow in js_strtod(), resulting in a buffer overflow in the pointer *d.

Mitigation and Prevention

In this section, we discuss the steps to mitigate the impact of CVE-2021-33797 and prevent any potential exploitation.

Immediate Steps to Take

It is crucial to apply the necessary patches provided by Artifex for the MuJS library versions 1.0.1 to 1.1.1 to address this vulnerability promptly. Additionally, monitoring for any suspicious activities on the network is recommended.

Long-Term Security Practices

Implementing robust security practices, such as regular vulnerability scanning, code reviews, and security updates, can help prevent similar vulnerabilities from being exploited in the future.

Patching and Updates

Stay informed about security updates and patches released by the MuJS library maintainers. Timely patching of software vulnerabilities is essential to enhance the security posture of the systems.