Session fixation in FortiWeb

1) Session Fixation

EUVDB-ID: #VU84878

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42761

CWE-ID: CWE-384 - Session Fixation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to usage of weak session identifiers in FortiWeb. A remote attacker can infer the session identifier of other users and possibly usurp their session.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiWeb: 5.6.0 - 6.4.3

CPE2.3

• cpe:2.3:a:fortinet:fortinet_fortiweb:6.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:6.3.16:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:6.2.6:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:5.7.3:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:5.8.7:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:6.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:6.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:5.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:fortinet:fortinet_fortiweb:5.6.2:*:*:*:*:*:*:*

External links

http://www.fortiguard.com/psirt/FG-IR-21-214

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

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

Is there known malware, which exploits this vulnerability?

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