Vulnerability identifier: #VU18609

Vulnerability risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-13379

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

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 settings

unset source-interface

end

Vulnerable software versions

FortiOS: 6.0.0 - 6.0.4, 5.6.3 - 5.6.7

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External links
http://fortiguard.com/psirt/FG-IR-18-384

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Q & A

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.