CVE-2020-9291 Explained : Impact and Mitigation

FortiClient for Windows 6.2.1 and earlier versions are affected by an Insecure Temporary File vulnerability that could lead to privilege escalation.

Understanding CVE-2020-9291

What is CVE-2020-9291?

An Insecure Temporary File vulnerability in FortiClient for Windows 6.2.1 and below may allow a local user to gain elevated privileges via exhausting the pool of temporary file names combined with a symbolic link attack.

The Impact of CVE-2020-9291

This vulnerability has a CVSS base score of 6.3, indicating a medium severity level. It could potentially allow a local user to escalate privileges.

Technical Details of CVE-2020-9291

Vulnerability Description

The vulnerability in FortiClient for Windows 6.2.1 and earlier versions arises from improper handling of temporary files, enabling a local user to exploit it for privilege escalation.

Affected Systems and Versions

Product: Fortinet FortiClient for Windows
Versions: FortiClient for Windows 6.2.1 and earlier, FortiClient for Windows 6.0.9 and earlier

Exploitation Mechanism

The vulnerability can be exploited by a local user through exhausting the pool of temporary file names combined with a symbolic link attack.

Mitigation and Prevention

Immediate Steps to Take

Update FortiClient to the latest version to patch the vulnerability.
Monitor and restrict access to sensitive system areas.
Educate users on safe computing practices to prevent exploitation.

Long-Term Security Practices

Regularly review and update security policies and procedures.
Conduct security training for employees to enhance awareness.

Patching and Updates

Apply security patches and updates provided by Fortinet to address the vulnerability.