HTTP response splitting in FortiOS and FortiProxy

1) HTTP response splitting

EUVDB-ID: #VU102595

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 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: No

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 - 7.6.0

FortiProxy: 7.2.0 - 7.4.5

CPE2.3

• cpe:2.3:o:fortinet:fortios:7.2.8:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.4.4:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.6.0:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.2.99:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:7.4.5:*:*:*:*:*:*:*

External links

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

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.