CVE-2021-23158 : Security Advisory and Response

A detailed overview of CVE-2021-23158 focusing on htmldoc vulnerability.

Understanding CVE-2021-23158

In this section, we will explore the nature and impact of the CVE-2021-23158 vulnerability in htmldoc.

What is CVE-2021-23158?

CVE-2021-23158 is a flaw discovered in htmldoc version 1.9.12 that allows an attacker to execute arbitrary code and launch denial of service attacks by exploiting a double-free vulnerability.

The Impact of CVE-2021-23158

The vulnerability in htmldoc can lead to a write-what-where condition, enabling threat actors to execute malicious code and disrupt services.

Technical Details of CVE-2021-23158

This section will dive into the technical aspects of the CVE-2021-23158 vulnerability.

Vulnerability Description

The issue lies in the function pspdf_export() in ps-pdf.cxx, where a double-free vulnerability exists, paving the way for attackers to exploit the system.

Affected Systems and Versions

The vulnerability affects htmldoc version 1.9.12 and versions prior to it, making them susceptible to exploitation.

Exploitation Mechanism

By leveraging the double-free vulnerability in htmldoc, attackers can trigger a write-what-where condition, ultimately leading to the execution of arbitrary code and denial of service.

Mitigation and Prevention

In this section, we will discuss the necessary steps to mitigate the risks associated with CVE-2021-23158.

Immediate Steps to Take

Users are advised to update htmldoc to a patched version beyond 1.9.12 to prevent exploitation of the double-free vulnerability.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and staying updated on patches and fixes are essential for long-term security.

Patching and Updates

Regularly check for updates and patches released by the htmldoc maintainers to address security vulnerabilities and enhance system protection.