CVE-2023-20269

Basic Information

CVE State

PUBLISHED

Reserved Date

October 27, 2022

Published Date

September 06, 2023

Last Updated

October 23, 2024

Vendor

Cisco

Product

Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software

Description

A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or 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 conducting a brute force attack or while establishing a clientless SSL VPN session using valid credentials. A successful exploit could allow the attacker to achieve one or both of the following: Identify valid credentials that could then be used to establish an unauthorized remote access VPN session. 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. Cisco will release software updates that address this vulnerability. There are workarounds that address this vulnerability.

CVSS Scores

SSVC Information

Exploitation

Active

Technical Impact

Partial

Exploit Status

Exploited in the Wild

Yes (added 2023-09-13 00:00:00 UTC) Source

Used in Malware

Yes (added 2023-09-13 00:00:00 UTC) Source