Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Privilege Escalation Vulnerability

CVE number = CVE-2022-20759

A vulnerability in the web services interface for remote access VPN features of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, but unprivileged, remote attacker to elevate privileges to level 15.

This vulnerability is due to improper separation of authentication and authorization scopes. An attacker could exploit this vulnerability by sending crafted HTTPS messages to the web services interface of an affected device. A successful exploit could allow the attacker to gain privilege level 15 access to the web management interface of the device. This includes privilege level 15 access to the device using management tools like the Cisco Adaptive Security Device Manager (ASDM) or the Cisco Security Manager (CSM).

Note: With Cisco FTD Software, the impact is lower than the CVSS score suggests because the affected web management interface allows for read access only.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Vulnerable Products

This vulnerability affects Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software and at least one of following conditions is true:

  • HTTPS Management Access and IKEv2 Client Services are both enabled on at least one (not necessarily the same) interface
  • HTTPS Management Access and WebVPN are both enabled on at least one (not necessarily the same) interface

Neither of these features is enabled by default in Cisco ASA Software or Cisco FTD Software.

For further information please read the advisory at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-mgmt-privesc-BMFMUvye

Luke Simmonds

Blogger at www.systemtek.co.uk

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