CVE-2021-27241 Explained : Impact and Mitigation

This CVE-2021-27241 article provides detailed information about a vulnerability found in Avast Premium Security 20.8.2429 (Build 20.8.5653.561) allowing local attackers to delete directories. It covers the impact, technical details, and mitigation steps.

Understanding CVE-2021-27241

This section delves into the specifics of CVE-2021-27241, outlining its nature and impact.

What is CVE-2021-27241?

CVE-2021-27241 is a vulnerability in Avast Premium Security, enabling local attackers to delete specific directories by exploiting a flaw within the AvastSvc.exe module.

The Impact of CVE-2021-27241

The vulnerability poses a medium severity threat as it allows attackers to create a denial-of-service condition by deleting directories, impacting system availability.

Technical Details of CVE-2021-27241

In this section, the technical aspects of CVE-2021-27241 are discussed including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw in Avast Premium Security 20.8.2429 enables attackers to abuse directory junctions, leading to unauthorized directory deletion.

Affected Systems and Versions

Avast Premium Security version 20.8.2429 (Build 20.8.5653.561) is affected by this vulnerability.

Exploitation Mechanism

Attackers with low-privileged code execution capabilities on the target system can exploit this vulnerability by creating directory junctions to delete directories.

Mitigation and Prevention

This section provides insights into how organizations and users can mitigate the risk associated with CVE-2021-27241.

Immediate Steps to Take

Users are advised to update Avast Premium Security to the latest version and limit low-privileged code execution on systems to prevent exploitation.

Long-Term Security Practices

Implementing a robust security policy and regularly updating security software can help prevent similar vulnerabilities in the future.

Patching and Updates

Avast should release patches addressing CVE-2021-27241 to eliminate the vulnerability and enhance system security.