Cisco Adaptive Security Appliance VPN SAML Authentication Bypass Vulnerability (cisco-sa-20190501-asaftd-saml-vpn)

Medium Nessus Plugin ID 128063

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version the Cisco Adaptive Security Appliance (ASA) software running on the remote device is affected by an authentication bypass vulnerability in the implementation of Security Assertion Markup Language (SAML) 2.0 Single Sign-On (SSO) for Clientless SSL VPN (WebVPN) and AnyConnect Remote Access VPN.
The vulnerability is due to improper credential management when using NT LAN Manager (NTLM) or basic authentication. An attacker could exploit this vulnerability by opening a VPN session to an affected device after another VPN user has successfully authenticated to the affected device via SAML SSO. A successful exploit could allow the attacker to connect to secured networks behind the affected device.
(CVE-2019-1714)

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvn72570.

See Also

http://www.nessus.org/u?4bb85a40

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn72570

Plugin Details

Severity: Medium

ID: 128063

File Name: cisco-sa-20190501-asaftd-saml-vpn-asa.nasl

Version: 1.6

Type: local

Family: CISCO

Published: 2019/08/22

Updated: 2019/12/20

Dependencies: 11936, 12634

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2019-1714

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:firepower_threat_defense

Required KB Items: Host/Cisco/ASA, Host/Cisco/ASA/model, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 2019/05/01

Vulnerability Publication Date: 2019/05/01

Reference Information

CVE: CVE-2019-1714

BID: 108185

CISCO-BUG-ID: CSCvn72570

CISCO-SA: cisco-sa-20190501-asaftd-saml-vpn

IAVA: 2019-A-0271

CWE: 255