CVE-2021-26738 : Security Advisory and Response

A privilege escalation vulnerability tracked as CVE-2021-26738 has been identified in Zscaler Client Connector for macOS prior to version 3.7. This vulnerability allows a local adversary to exploit an unquoted search path vulnerability via the PATH variable, potentially leading to the execution of arbitrary code with root privileges.

Understanding CVE-2021-26738

This section delves deeper into the nature of the CVE-2021-26738 vulnerability.

What is CVE-2021-26738?

The CVE-2021-26738 vulnerability is classified as a privilege escalation threat (CAPEC-233) that stems from an unquoted search path issue in Zscaler Client Connector for macOS versions preceding 3.7.

The Impact of CVE-2021-26738

The vulnerability poses a high severity risk, allowing a local attacker to elevate privileges and potentially execute malicious code with root-level permissions.

Technical Details of CVE-2021-26738

This section outlines the technical aspects of the CVE-2021-26738 vulnerability.

Vulnerability Description

Zscaler Client Connector for macOS prior to version 3.7 is susceptible to a privilege escalation issue through an unquoted search path in the PATH variable, enabling unauthorized code execution with elevated privileges.

Affected Systems and Versions

The vulnerability affects Zscaler Client Connector for macOS versions older than 3.7.

Exploitation Mechanism

A local attacker can exploit the unquoted search path vulnerability via the PATH variable to achieve privilege escalation and execute arbitrary code with root permissions.

Mitigation and Prevention

In this section, we explore the steps to mitigate the risks associated with CVE-2021-26738.

Immediate Steps to Take

Users are advised to update Zscaler Client Connector to version 3.7 or newer to prevent exploitation of this vulnerability. Additionally, audit and secure system PATH variables to mitigate similar risks.

Long-Term Security Practices

Implementing proper access controls, regularly updating software, and monitoring PATH configurations can enhance overall system security and prevent privilege escalation attacks.

Patching and Updates

Stay informed on security updates from Zscaler and promptly apply patches to address known vulnerabilities and strengthen the security posture of Zscaler Client Connector.