Improper certificate validation in Fortinet FortiGate



Published: 2021-06-01
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-24012
CWE-ID CWE-295
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		FortiOS
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper certificate validation

EUVDB-ID: #VU53716

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-24012

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to improper verification of the user certificate's chain of trust when connecting to SSL-VPN. A remote LDAP user with any certificate that is signed by a trusted Certificate Authority can connect to VPN server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.4.0 - 6.4.4

CPE2.3 External links

http://www.fortiguard.com/psirt/FG-IR-21-018


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.



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