#VU55555 HTTP response splitting in FortiManager and FortiAnalyzer - CVE-2021-32598

Vulnerability identifier: #VU55555

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-32598

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiManager
Server applications / IDS/IPS systems, Firewalls and proxy servers
FortiAnalyzer
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote user to perform HTTP splitting attacks.

The vulnerability exists due to software does not correctly processes CRLF character sequences in FortiManager and FortiAnalyzer GUI. A remote user can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiManager: 5.6.0 - 5.6.11, 6.0.0 - 6.0.11, 6.2.0 - 6.2.8, 6.4.0 - 6.4.6, 7.0.0

FortiAnalyzer: 5.6.0 - 5.6.11, 6.0.0 - 6.0.11, 6.2.0 - 6.2.8, 6.4.0 - 6.4.6, 7.0.0

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External links
https://www.fortiguard.com/psirt/FG-IR-21-063

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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