Vulnerability identifier: #VU80521

Vulnerability risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-20269

CWE-ID: CWE-288

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Hardware solutions / Security hardware applicances
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to improper separation of authentication, authorization, and accounting (AAA) between the remote access VPN feature and the HTTPS management and site-to-site VPN features. A remote user can perform a brute-force attack and establish a clientless SSL VPN session with an unauthorized user.

Note, the vulnerability is being actively exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Adaptive Security Appliance (ASA): 6.2.3 - 9.19.1.18

Cisco Firepower Threat Defense (FTD): 6.2.3 - 6.2.3.18, 6.4.0 - 6.4.0.16, 6.6.0 - 6.6.7.1, 7.0.0 - 7.0.6, 7.1.0 - 7.1.0.3, 7.2.4 - 7.2.4.1, 7.2.5, 7.3.0, 7.3.1 - 7.3.1.1, 9.12.4 - 9.12.4.58, 9.14.4 - 9.14.4.23, 9.16.4 - 9.16.4.38, 9.17.1 - 9.17.1.30, 9.18.2 - 9.18.2.8, 9.18.3 - 9.18.3.55, 9.19.1 - 9.19.1.18, 9.8.4 - 9.8.4.48, 7.2.3, 7.2.2, 9.16.3 - 9.16.3.23, 9.18.1 - 9.18.1.3, 9.16.2 - 9.16.2.14, 9.12.1 - 9.12.1.3, 9.12.2 - 9.12.2.9, 9.12.3 - 9.12.3.12, 9.14.1 - 9.14.1.30, 9.14.2 - 9.14.2.15, 9.14.3 - 9.14.3.18, 9.15.1 - 9.15.1.21, 9.16.1 - 9.16.1.28, 9.8.1 - 9.8.1.7, 9.8.2 - 9.8.2.38, 9.8.3 - 9.8.3.29, 7.2.1, 7.2.0 - 7.2.0.1, 6.7.0 - 6.7.0.3

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ravpn-auth-8LyfCkeC

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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?

Yes. This vulnerability is being exploited in the wild.