CVE-2021-40647 : Vulnerability Insights and Analysis

The following article provides detailed information about CVE-2021-40647, a vulnerability in man2html 1.6g.

Understanding CVE-2021-40647

This section delves into the specifics of the CVE-2021-40647 vulnerability.

What is CVE-2021-40647?

In man2html 1.6g, a specific string read from a file can overwrite the size parameter in the heap's top chunk. This could lead to a segmentation abort if the heap size parameter is misaligned. Versions before GLIBC version 2.29 can allow arbitrary write anywhere in the program's memory.

The Impact of CVE-2021-40647

The vulnerability can result in arbitrary writes in program memory.

Technical Details of CVE-2021-40647

Exploring the technical aspects of CVE-2021-40647.

Vulnerability Description

The issue in man2html 1.6g arises from a specific string overriding the heap's top chunk size parameter.

Affected Systems and Versions

Affected Product: N/A
Vendor: N/A
Affected Version: N/A

Exploitation Mechanism

The vulnerability allows attackers to write anywhere in the program's memory when certain conditions are met.

Mitigation and Prevention

Guidelines to mitigate the impacts of CVE-2021-40647.

Immediate Steps to Take

Update to GLIBC version 2.29 or later to prevent arbitrary writes.
Avoid running untrusted man2html files.

Long-Term Security Practices

Regularly update software to the latest versions.
Conduct security assessments to identify and mitigate similar vulnerabilities.

Patching and Updates

Keeping software and dependencies up-to-date is crucial to prevent exploitation.