Open redirect in FortiOS and FortiProxy sslvpnd

1) Open redirect

EUVDB-ID: #VU74852

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22641

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data in sslvpnd. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 7.2.3

FortiProxy: 1.0.0 - 7.2.2

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.2.13:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.12:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.16:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.9:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.2.3:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:2.0.12:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.8:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.2:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.2.13:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.1.6:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.0.7:*:*:*:*:*:*:*

External links

http://fortiguard.fortinet.com/psirt/FG-IR-22-479

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.