Summary

• 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.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgmt-privesc-BMFMUvye

  This advisory is part of the April 2022 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Affected Products

• 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 information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.

  Determine the Device Configuration

  Determine the HTTPS Management Access Configuration

  To identify the status and port of the HTTPS management access, use the show running-config http CLI command. The following example shows the output of the show running-config http command on a device that has HTTPS management access enabled on the inside and outside interface using TCP port 8443:

  asa# show running-config http          
  http server enable 8443
  http 0.0.0.0 0.0.0.0 inside
  http 0.0.0.0 0.0.0.0 outside

  If the line starting with http server enable does not include a port, the default port 443 is used. The exact port value does not affect the vulnerability status of the device.

  If the line starting with http server enable is missing or the output does not include an HTTP access-control list (ACL) associated with an interface, the HTTPS management access is disabled.

  The exact value of the HTTP ACL does not affect the vulnerability status of the device. However, for successful exploitation, the attacker has to be able to connect to the HTTPS management server of the device from an IP address that is permitted by the HTTP ACL.

  Determine the IKEv2 Client Services Configuration

  To identify the status and port of the IKEv2 client services, use the show running-config crypto ikev2 | include port CLI command. The following example shows the output of the show running-config crypto ikev2 | include port command on a device that IKEv2 client services enabled on the outside interface using TCP port 8443:

  asa# show running-config crypto ikev2 | include port
  crypto ikev2 enable outside client-services port 8443

  The exact port value does not affect the vulnerability status of the device.

  If the command output is empty, IKEv2 client services are not enabled.

  Determine the WebVPN Configuration

  To identify the status and port of WebVPN, use the show running-config all webvpn | include ^ port |^ enable CLI command. The following example shows the output of the show running-config all webvpn | include ^ port |^ enable command on a device that has WebVPN enabled on the outside interface using TCP port 8443:

  asa# show running-config all webvpn | include ^ port |^ enable
   port 8443
   enable outside

  The exact port value does not affect the vulnerability status of the device.

  If the command output is empty output or there is no enable statement, WebVPN is not enabled.

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

  Cisco has confirmed that this vulnerability does not affect Cisco Firepower Management Center (FMC) Software.

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• Cisco has released free software updates that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

  Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
  https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

  Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

  The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.

  When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

  Customers Without Service Contracts

  Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

  Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

  Fixed Releases

  In the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the Critical or High SIR vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

  ASA Software

  Cisco ASA Software Release	First Fixed Release for This Vulnerability	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  9.7 and earlier1	Migrate to a fixed release.	Migrate to a fixed release.
  9.8	9.8.4.43	9.8.4.44 (June 2022)
  9.91	Migrate to a fixed release.	Migrate to a fixed release.
  9.101	Migrate to a fixed release.	Migrate to a fixed release.
  9.12	9.12.4.38	9.12.4.38
  9.131	Migrate to a fixed release.	Migrate to a fixed release.
  9.14	9.14.4	9.14.4
  9.15	9.15.1.21	9.15.1.21
  9.16	9.16.2.13	9.16.2.14
  9.17	9.17.1.7	9.17.7

  1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9, 9.10, and 9.13 have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.

  
  

  FTD Software

  Cisco FTD Software Release	First Fixed Release for This Vulnerability	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  6.2.2 and earlier1	Migrate to a fixed release.	Migrate to a fixed release.
  6.2.3	Migrate to a fixed release.	Migrate to a fixed release.
  6.3.01	Migrate to a fixed release.	Migrate to a fixed release.
  6.4.0	6.4.0.15	6.4.0.15
  6.5.01	Migrate to a fixed release.	Migrate to a fixed release.
  6.6.0	6.6.5.2	6.6.5.2
  6.7.0	Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tar Cisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tar Cisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tar Cisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar	Migrate to a fixed release.
  7.0.0	7.0.2	7.0.2
  7.1.0	7.1.0.1	7.1.0.1

  1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.

  
  

  For instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide.

  The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• Cisco would like to thank the Orange CERT-CC and SA2 teams for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgmt-privesc-BMFMUvye

Revision History

• Version	Description	Section	Status	Date
  1.3	Updated ASA 9.8 first fixed release information.	Fixed Software	Final	2022-JUN-01
  1.2	Fixed broken link in Summary section.	Summary	Final	2022-MAY-17
  1.1	Further clarified the conditions for the vulnerable status.	Vulnerable Products	Final	2022-MAY-03
  1.0	Initial public release.	-	Final	2022-APR-27

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