Vulnerability identifier: #VU87497

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-42789

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system
FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in captive portal. A remote attacker can send specially crafted HTTP requests to the affected device, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 7.4.0 - 7.4.1, 7.2.0 - 7.2.5, 7.0.0 - 7.0.12, 6.4.0 - 6.4.14, 6.2.0 - 6.2.15

FortiProxy: 7.4.0, 7.2.0 - 7.2.6, 7.0.0 - 7.0.12, 2.0.0 - 2.0.13

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External links
http://fortiguard.com/psirt/FG-IR-23-328

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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.