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             AUSCERT External Security Bulletin Redistribution

                  FortiClient DLL Hijacking Vulnerability
                               12 March 2020


        AusCERT Security Bulletin Summary

Product:           FortiClient for Windows
Publisher:         Fortinet
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-9290 CVE-2020-9287 CVE-2019-5589

Original Bulletin: 

Revision History:  March 12 2020: Vendor added CVEs 2020-9290 and 2020-9287.
                   May   17 2019: Initial Release

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FortiClient installer DLL Hijacking Vulnerability

IR Number : FG-IR-19-060
Date      : May 16, 2019
Risk      : 3/5
Impact    : Unauthorized code execution.
CVE ID    : CVE-2019-5589, CVE-2020-9287, CVE-2020-9290


Multiple unsafe search path vulnerabilities in FortiClient online installers
may allow an attacker with control over the directory in which the installers
reside to execute arbitrary code on the system via uploading malicious .dll
files in that directory.


Unauthorized code execution.

Affected Products

FortiClientOnlineInstaller.exe for FortiClient for Windows 6.0.5 and below

FortiClientOnlineInstaller.exe for FortiClient for Windows 6.2.3 and below

FortiClientVPNOnlineInstaller.exe for FortiClient VPN for Windows 6.2.3 and
below (CVE-2020-9290)

FortiClientEMSOnlineInstaller.exe for FortiClient EMS 6.2.1 and below


CVE-2019-5589: Use FortiClient for Windows online installer 6.0.6 or above

CVE-2020-9290: Use FortiClient for Windows online installer 6.2.4 or above, and
FortiClient VPN for Windows online installer 6.2.4 or above

CVE-2020-9287: Use FortiClient EMS online installer 6.2.2 or above

Revision History:

05-16-2019 Initial version
03-09-2020 add CVE-2020-9290 and CVE-2020-9287


Fortinet is pleased to thank Independent security researcher Honc
(honcbb@gmail.com) for reporting CVE-2019-5589 and CVE-2020-9290, Houjingyi
(houjingyi647@gmail.com) for reporting CVE-2020-9290 and CVE-2020-9287,
security researcher Eran Shimony from CyberArk Labs for reporting CVE-2020-9290
under responsible disclosures.

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