CVE-2021-42202 : Vulnerability Insights and Analysis

An issue was discovered in swftools through 20201222, leading to a NULL pointer dereference in the function swf_DeleteFilter() in swffilter.c, allowing for Denial of Service.

Understanding CVE-2021-42202

This CVE describes a vulnerability in swftools that could be exploited for Denial of Service attacks.

What is CVE-2021-42202?

The vulnerability identified in swftools up to version 20201222 enables an attacker to trigger a NULL pointer dereference by abusing the swf_DeleteFilter() function, ultimately facilitating a Denial of Service attack.

The Impact of CVE-2021-42202

This vulnerability poses a risk of service disruption as an attacker can exploit it to cause a Denial of Service.

Technical Details of CVE-2021-42202

The following are the technical aspects of CVE-2021-42202.

Vulnerability Description

A NULL pointer dereference vulnerability in the swf_DeleteFilter() function of swffilter.c within swftools up to version 20201222.

Affected Systems and Versions

Affected version: up to 20201222
Systems using swftools without the necessary patches

Exploitation Mechanism

The vulnerability can be exploited by an attacker to trigger a NULL pointer dereference by executing specially crafted requests to the affected function.

Mitigation and Prevention

It is crucial to take immediate actions to address and prevent potential exploits.

Immediate Steps to Take

Apply official patches or updates provided by swftools.
Restrict access to vulnerable systems.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update software and apply security patches.
Conduct security audits and code reviews to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that all systems running swftools are updated with the latest patches.
Stay informed about future security releases from the swftools project.