A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to establish a clientless SSL VPN session with an unauthorized user.
This vulnerability is 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. An attacker could exploit this vulnerability by specifying a default connection profile/tunnel group  while establishing a clientless SSL VPN session using valid credentials. A successful exploit could allow the attacker to establish a clientless SSL VPN session (only when running Cisco ASA Software Release 9.16 or earlier). Notes: Establishing a client-based remote access VPN tunnel is not possible as these default connection profiles/tunnel groups do not and cannot have an IP address pool configured. This vulnerability does not allow an attacker to bypass authentication. To successfully establish a remote access VPN session, valid credentials are required including a valid second factor if multi-factor authentication (MFA) is configured.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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Cisco Adaptive Security Appliance Software Remote Access VPN Unauthorized Access - Unauthorized Clientless SSL VPN Session Establishment (cisco-sa-asaftd-ravpn-auth-8LyfCkeC)

critical Nessus Plugin ID 181183

Version 1.7