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 Vulnerability #1 is being exploited in the wild.
Vulnerable software
Subscribe 		FortiOS
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Authorization

EUVDB-ID: #VU18607

Risk: High

CVSSv3.1: 8.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L/E:H/RL:O/RC:C]

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 - 6.0.4

External links

http://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?

Yes. This vulnerability is being exploited in the wild.



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