Security restrictions bypass in FortiOS

1) Incorrect calculation

EUVDB-ID: #VU94004

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-26015

CWE-ID: CWE-682 - Incorrect Calculation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to incorrect parsing of IP addresses when handling zero characters. A remote attacker on the local network can send specially crafted requests and bypass the IP blocklist.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiProxy: 7.0.0 - 7.4.3

FortiOS: 7.0.0 - 7.4.3

CPE2.3

• cpe:2.3:h:fortinet:fortiproxy:7.4.3:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.0.18:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.10:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.15:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.2.8:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.4.3:*:*:*:*:*:*:*

External links

http://fortiguard.fortinet.com/psirt/FG-IR-23-446

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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