Detections
Analytics
Cisco Adaptive Security Appliance Software Remote Access VPN Unauthorized Access - Brute Force Attack (cisco-sa-asaftd-ravpn-auth-8LyfCkeC)
critical Nessus Plugin ID 182523
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
A vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations. 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. A successful exploit could allow the attacker to identify valid credentials that could then be used to establish an unauthorized remote access VPN session. 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.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwh23100 and CSCwh45108See Also
http://www.nessus.org/u?e25914dd
Plugin Details
Severity: Critical
ID: 182523
File Name: cisco-sa-asaftd-ravpn-auth-8LyfCkeC_bruteforce.nasl
Version: 1.0
Type: local
Family: CISCO
Published: 10/4/2023
Updated: 10/4/2023
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: High
Score: 8.2
CVSS v2
Risk Factor: High
Base Score: 9.4
Temporal Score: 8.2
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N
CVSS Score Source: CVE-2023-20269
CVSS v3
Risk Factor: Critical
Base Score: 9.1
Temporal Score: 8.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:cisco:adaptive_security_appliance_software
Required KB Items: Host/Cisco/ASA/model
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/6/2023
Vulnerability Publication Date: 9/6/2023
CISA Known Exploited Vulnerability Due Dates: 10/4/2023
Reference Information
CVE: CVE-2023-20269