Hard-coded SSLVPN cookie encryption key in FortiOS

1) Use of Hard-coded Cryptographic Key

EUVDB-ID: #VU58628

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-26108

CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key

Exploit availability: No

Description

The vulnerability allows a remote attacker to decrypt traffic.

The vulnerability exists due to usage of a hard-coded SSL VPN cookie encryption key. A remote attacker can extract the encryption key and use it to decrypt traffic.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 5.6.0 - 6.4.5

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.4.5:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.2.9:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.12:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:5.6.13:*:*:*:*:*:*:*

External links

http://www.fortiguard.com/psirt/FG-IR-21-051

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.