Authentication bypass in FortiOS SSL VPN



Published: 2019-05-27
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2018-13382
CWE ID CWE-285
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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FortiOS
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Advisory

This security advisory describes one high risk vulnerability.

1) Improper Authorization

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2018-13382

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass authorization.

The vulnerability exists due to unspecified error within the SSL VPN web portal when processing HTTP requests. A remote non-authenticated attacker can send a specially crafted HTTP request to the SSL VPN web portal and change password for arbitrary account.

Successful exploitation of the vulnerability may allow an attacker to login to the SSL VPN web portal with a new password and gain unauthorized access to network resources.

Mitigation

Install updates from vendor's website.

As a workaround, the vendor recommends disabling the SSL-VPN web portal service:

	 config vpn ssl settings
unset source-interface
end

Vulnerable software versions

FortiOS: 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.4.10, 5.6.0, 5.6.1, 5.6.2, 5.6.3, 5.6.4, 5.6.5, 5.6.6, 5.6.7, 5.6.8, 6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4

CPE External links

https://fortiguard.com/psirt/FG-IR-18-389

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?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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