CVE-2021-26089 : Exploit Details and Defense Strategies

An improper symlink following vulnerability in Fortinet FortiClient for Mac versions 6.4.3 and below may allow a non-privileged user to execute arbitrary privileged shell commands during the installation phase.

Understanding CVE-2021-26089

This CVE involves an improper symlink following vulnerability in Fortinet FortiClient for Mac, version 6.4.3 and below.

What is CVE-2021-26089?

CVE-2021-26089 is a vulnerability in Fortinet FortiClient for Mac that allows a non-privileged user to execute arbitrary privileged shell commands during the software installation phase.

The Impact of CVE-2021-26089

The vulnerability has a CVSS base score of 6.7, indicating a medium severity issue. It has a high impact on availability, confidentiality, and integrity, with low privileges required to exploit it. The attack complexity is high, and user interaction is required.

Technical Details of CVE-2021-26089

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability involves an improper symlink following in Fortinet FortiClient for Mac versions 6.4.3 and below, which may allow a non-privileged user to execute arbitrary privileged shell commands during the installation phase.

Affected Systems and Versions

Fortinet FortiClient for Mac versions 6.4.3 and below are affected by this vulnerability.

Exploitation Mechanism

A non-privileged user can exploit this vulnerability to execute arbitrary privileged shell commands during the software installation process.

Mitigation and Prevention

To address CVE-2021-26089, users and organizations can take the following steps:

Immediate Steps to Take

Update Fortinet FortiClient for Mac to a secure version that addresses the vulnerability.
Monitor for any suspicious activities on the system.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement the principle of least privilege and restrict user permissions.

Patching and Updates

Ensure that all systems are kept up to date with the latest security patches and software updates to mitigate the risk of exploitation.