CVE-2021-26734 : Exploit Details and Defense Strategies

Zscaler Client Connector Installer on Windows before version 3.4.0.124 improperly handled directory junctions during uninstallation, allowing a local adversary to delete folders in an elevated context.

Understanding CVE-2021-26734

This section explains the impact and technical details of the vulnerability.

What is CVE-2021-26734?

CVE-2021-26734 is a vulnerability in Zscaler Client Connector Installer on Windows prior to version 3.4.0.124, enabling a privilege escalation attack by mishandling directory junctions during uninstallation.

The Impact of CVE-2021-26734

The vulnerability can be exploited by a local attacker to delete folders in an elevated context, potentially leading to unauthorized access and compromise of sensitive data.

Technical Details of CVE-2021-26734

Outlined are the specifics of the vulnerability.

Vulnerability Description

The flaw arises from the incorrect handling of directory junctions during uninstallation, allowing an attacker to escalate privileges.

Affected Systems and Versions

The vulnerability affects Zscaler Client Connector Installer on Windows versions prior to 3.4.0.124.

Exploitation Mechanism

A local adversary can exploit this vulnerability to manipulate directory junctions during uninstallation and delete folders in an elevated context.

Mitigation and Prevention

Discover how to address and prevent this security issue.

Immediate Steps to Take

Users should update Zscaler Client Connector to version 3.4.0.124 or above to mitigate the vulnerability and prevent privilege escalation attacks.

Long-Term Security Practices

Implementing robust privilege management controls and regular security updates can enhance overall system security.

Patching and Updates

Regularly apply security patches and updates provided by Zscaler to safeguard systems from known vulnerabilities.