CVE-2019-17652 : Vulnerability Insights and Analysis

FortiClient for Linux versions 6.2.1 and earlier is affected by a stack buffer overflow vulnerability that can be exploited by a user with limited privileges to crash FortiClient processes running with root privileges.

Understanding CVE-2019-17652

This CVE involves an escalation of privilege vulnerability in FortiClient for Linux.

What is CVE-2019-17652?

A stack buffer overflow vulnerability in FortiClient for Linux 6.2.1 and below allows a user with low privilege to crash FortiClient processes running under root privilege by sending specially crafted requests to the fctsched process.

The Impact of CVE-2019-17652

The vulnerability can be exploited by a user with limited privileges to crash FortiClient processes running with root privileges, potentially leading to a denial of service.

Technical Details of CVE-2019-17652

FortiClientLinux 6.2.1 and below are affected by this vulnerability.

Vulnerability Description

The issue is a stack buffer overflow vulnerability that can be triggered by sending carefully crafted client requests of the "StartAvCustomScan" type to the fctsched process.

Affected Systems and Versions

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

Exploitation Mechanism

By sending specially crafted client requests of the "StartAvCustomScan" type to the fctsched process, the vulnerability can be exploited as the argv data is not properly sanitized.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update FortiClientLinux to a patched version that addresses the vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch all software to prevent known vulnerabilities.
Implement the principle of least privilege to limit the impact of potential exploits.

Patching and Updates

Ensure that FortiClientLinux is regularly updated with the latest security patches to mitigate the risk of exploitation.