Privilege escalation in online installer due to incorrect working director

Summary

An improper initialization [CWE-665] vulnerability in FortiClient (Windows) may allow a local attacker to gain administrative privileges via placing a malicious executable inside the FortiClient installer's directory.

Affected Products

FortiClient (Windows) version 6.4.7 and below
FortiClient (Windows) version 7.0.2 and below
FortiClient (Windows) 6.0 all versions
FortiClient (Windows) 6.2 all versions

Solutions

Upgrade to FortiClient (Windows) 7.0.3 or above
Upgrade to FortiClient (Windows) 6.4.8 or above

Acknowledgement

Fortinet is pleased to thank JaeHeng Yoon of JENBlack Soft for reporting this vulnerability under responsible disclosure.

Timeline

2022-04-05: Initial publication