Privilege escalation in FortiOS and FortiProxy VDOM

1) Path traversal

EUVDB-ID: #VU73207

Risk: Low

CVSSv4.0: 5.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-42476

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to input validation error when processing directory traversal sequences. A local privileged VDOM administrator can escalate their privileges to super admin of the box via crafted CLI requests.

Mitigation

Install update from vendor's website.

Vulnerable software versions

FortiOS: 6.2.0 - 7.2.3

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.2.0:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.1:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.3:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.4:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.5:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.6:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.7:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.8:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.9:*:*:*:*:*:*:*

External links

https://fortiguard.com/psirt/FG-IR-22-401

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.