CVE-2019-16155 : What You Need to Know

FortiClient for Linux versions 6.2.1 and earlier have a security flaw that can be exploited for privilege escalation. This vulnerability enables a user with limited privileges to overwrite root system files with any desired content by using specially crafted 'BackupConfig' type IPC client requests to the fctsched process. Additionally, FortiClient for Linux versions 6.2.2 and earlier inadvertently allow low privilege users to write to the system backup file under root privilege via the graphical user interface, which can result in the overwrite of root system files.

Understanding CVE-2019-16155

This CVE involves a privilege escalation vulnerability in FortiClient for Linux versions 6.2.1 and below, potentially allowing unauthorized users to overwrite critical system files.

What is CVE-2019-16155?

CVE-2019-16155 is a security vulnerability in FortiClient for Linux versions 6.2.1 and earlier that permits users with low privileges to overwrite root system files, leading to potential system compromise.

The Impact of CVE-2019-16155

The vulnerability allows attackers to escalate their privileges and manipulate system files, posing a significant risk of unauthorized access and potential system compromise.

Technical Details of CVE-2019-16155

FortiClient for Linux versions 6.2.1 and below are affected by this privilege escalation vulnerability.

Vulnerability Description

The flaw allows users with limited privileges to overwrite critical system files by exploiting specially crafted IPC client requests to the fctsched process.

Affected Systems and Versions

Product: Fortinet FortiClientLinux
Vendor: Fortinet
Vulnerable Versions: FortiClientLinux 6.2.1 and below

Exploitation Mechanism

Attackers can exploit the vulnerability by sending malicious 'BackupConfig' type IPC client requests to the fctsched process, enabling them to overwrite root system files.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2019-16155.

Immediate Steps to Take

Update FortiClient for Linux to a secure version that addresses the vulnerability.
Monitor system files for any unauthorized changes or modifications.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access and permissions.
Regularly review and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Apply patches and updates provided by Fortinet to fix the vulnerability and enhance system security.