#VU102595 HTTP response splitting in FortiOS and FortiProxy - CVE-2024-54021

Vulnerability identifier: #VU102595

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-54021

CWE-ID: CWE-113

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 bypass the file filter

The vulnerability exists due to software does not correctly process CRLF character sequences. A remote attacker can send a specially crafted request containing CRLF sequence and bypass the file filter.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 7.2.0 - 7.2.8, 7.4.0 - 7.4.4, 7.6.0

FortiProxy: 7.2.0 - 7.2.99, 7.4.0 - 7.4.5

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External links
https://www.fortiguard.com/psirt/FG-IR-24-282

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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.