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Vulnerability of Fortinet FortiClient: executing DLL code via Online Installer

Synthesis of the vulnerability 

An attacker can create a malicious DLL, and then put it in the current directory of Fortinet FortiClient, in order to execute code.
Vulnerable software: FortiClient.
Severity of this announce: 2/4.
Number of vulnerabilities in this bulletin: 3.
Creation date: 16/05/2019.
Revision date: 16/03/2020.
Références of this computer vulnerability: CERTFR-2019-AVI-227, CVE-2019-5589, CVE-2020-9287, CVE-2020-9290, FG-IR-19-060, VIGILANCE-VUL-29347.

Description of the vulnerability 

The Fortinet FortiClient product uses external shared libraries (DLL).

However, if the working directory contains a malicious DLL, it is automatically loaded.

An attacker can therefore create a malicious DLL, and then put it in the current directory of Fortinet FortiClient, in order to execute code.
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This security vulnerability impacts software or systems such as FortiClient.

Our Vigil@nce team determined that the severity of this computer weakness bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of intranet server.

This bulletin is about 3 vulnerabilities.

An attacker with a expert ability can exploit this security note.

Solutions for this threat 

Fortinet FortiClient: versions 6.0.6 and 6.2.4.
Versions 6.0.6 and 6.2.4 are fixed:
  https://fortinet.com/
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