Summary

• Multiple vulnerabilities in the Media Gateway Control Protocol (MGCP) inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  The vulnerabilities are due to inefficient memory management. An attacker could exploit these vulnerabilities by sending crafted MGCP packets through an affected device. An exploit could allow the attacker to cause memory exhaustion resulting in a restart of an affected device, causing a DoS condition for traffic traversing the device.

  Cisco has released software updates that address the vulnerabilities described in this advisory. There are no workarounds that address these vulnerabilities.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgcp-SUqB8VKH

  This advisory is part of the May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 12 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Affected Products

• Vulnerable Products

  These vulnerabilities affect Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software and they are configured to inspect MGCP traffic. MGCP inspection is not enabled in the default inspection policy.

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

  Determining if MGCP Inspection Is Enabled

  To determine whether MGCP inspection is enabled, administrators can use the show running-config policy-map command, followed by the show running-config service-policy command.

  Use the show running-config policy-map command, and check whether the inspect mgcp <map_name> command is present in at least one policy map. In the following output, the global-policy policy map includes the inspect mgcp <map_name> command:

  asa# show running-config policy-map 
  !
  policy-map global_policy
   class inspection_default
    inspect ip-options 
    inspect netbios 
    inspect rtsp
    inspect mgcp <map_name>
    inspect sunrpc 
    inspect tftp 
    inspect xdmcp 
    inspect dns preset_dns_map 
    inspect ftp 
    inspect h323 h225

  
  Use the show running-config service-policy command, and check whether the policy map is applied, either globally or to a single interface. The following output shows the global-policy policy map applied globally:

  asa# show running-config service-policy
  service-policy global_policy global

  
  If the policy map that contains the inspect mgcp <map_name> command is applied globally or to an interface, MGCP inspection is enabled.

  Products Confirmed Not Vulnerable

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

  Cisco has confirmed that these vulnerabilities do not affect Cisco Firepower Management Center (FMC).

Workarounds

• There are no workarounds that address these vulnerabilities.

  To reduce the attack surface for exploitation of these vulnerabilities, administrators could implement an access control policy that denies MGCP traffic on untrusted interfaces.

Fixed Software

• Cisco has released free software updates that address the vulnerabilities described in this advisory. 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.

  When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts 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 tables, the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerabilities described in this advisory and the first release that includes the fix for these vulnerabilities. The right column indicates whether a release is affected by any of the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

  Cisco ASA Software

  Cisco ASA Major Release	First Fixed Release for These Vulnerabilities	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  Earlier than 9.51	Migrate to a fixed release.	Migrate to a fixed release.
  9.5	Migrate to a fixed release.	Migrate to a fixed release.
  9.6	9.6.4.34	Migrate to a fixed release.
  9.71	Migrate to a fixed release.	Migrate to a fixed release.
  9.8	9.8.4.7	9.8.4.20
  9.9	9.9.2.66	9.9.2.67
  9.10	9.10.1.27	9.10.1.40
  9.12	9.12.2.1	9.12.3.9
  9.13	Not vulnerable.	9.13.1.10
  9.14	Not vulnerable.	Not vulnerable.

  1. Cisco ASA Software releases 9.5 and earlier, as well as Release 9.7, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for these vulnerabilities.

  Cisco FTD Software

  Cisco FTD Major Release	First Fixed Release for These Vulnerabilities	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  Earlier than 6.1.01	Migrate to a fixed release.	Migrate to a fixed release.
  6.1.0	Migrate to a fixed release.	Migrate to a fixed release.
  6.2.0	Migrate to a fixed release.	Migrate to a fixed release.
  6.2.1	Migrate to a fixed release.	Migrate to a fixed release.
  6.2.2	Migrate to a fixed release.	Migrate to a fixed release.
  6.2.3	6.2.3.16 (June 2020) Cisco_FTD_Hotfix_DT-6.2.3.16-3.sh.REL.tar Cisco_FTD_SSP_FP2K_Hotfix_DT-6.2.3.16-3.sh.REL.tar Cisco_FTD_SSP_Hotfix_DT-6.2.3.16-3.sh.REL.tar	6.2.3.16 (June 2020) Cisco_FTD_Hotfix_DT-6.2.3.16-3.sh.REL.tar Cisco_FTD_SSP_FP2K_Hotfix_DT-6.2.3.16-3.sh.REL.tar Cisco_FTD_SSP_Hotfix_DT-6.2.3.16-3.sh.REL.tar
  6.3.0	6.3.0.4	6.3.0.6 (future release) Cisco_FTD_Hotfix_AO-6.3.0.6-2.sh.REL.tar Cisco_FTD_SSP_FP2K_Hotfix_ AO-6.3.0.6-2.sh.REL.tar Cisco_FTD_SSP_Hotfix_ AO-6.3.0.6-2.sh.REL.tar
  6.4.0	6.4.0.4	6.4.0.9
  6.5.0	Not vulnerable.	6.5.0.5 (future release) Cisco_FTD_Hotfix_H-6.5.0.5-2.sh.REL.tar and later Cisco_FTD_SSP_FP1K_Hotfix_H-6.5.0.5-2.sh.REL.tar and later Cisco_FTD_SSP_FP2K_Hotfix_H-6.5.0.5-2.sh.REL.tar and later Cisco_FTD_SSP_Hotfix_H-6.5.0.5-2.sh.REL.tar and later
  6.6.0	Not vulnerable.	6.6.0

  1. Cisco FMC and FTD Software releases 6.0.1 and earlier have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for these vulnerabilities.

  To upgrade to a fixed release of Cisco FTD Software, customers can do one of the following:

  • For devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy.
  • For devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy.

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

Source

• These vulnerabilities were found during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgcp-SUqB8VKH

Revision History

• Version	Description	Section	Status	Date
  1.2	Updated Hot Fixes for FTD releases 6.4.0 and 6.5.0.	Fixed Releases	Final	2020-MAY-15
  1.3	Updated fixed release information for FTD Release 6.4.0.	Fixed Releases	Final	2020-MAY-06
  1.1	Updated ASA Fixed Release table to indicate 9.10.1.40 as the correct fixed release instead of 9.10.1.39.	Fixed Releases	Final	2020-MAY-06
  1.0	Initial public release.	—	Final	2020-MAY-06

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