This security bulletin contains one medium risk vulnerability.
Exploit availability: YesDescription
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences. A remote non-authenticated attacker can send a specially crafted HTTP request and download arbitrary file from FortiOS SSL VPN web portal.Mitigation
Install updates from vendor's website.
As a temporary solution, disable the SSL-VPN web portal service by applying the following CLI commands:
config vpn ssl settingsVulnerable software versions
FortiOS: 5.6.3 - 6.0.4
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.