Summary

• A vulnerability in the Open Shortest Path First (OSPF) implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the reload of an affected device, resulting in a denial of service (DoS) condition.

  The vulnerability is due to improper memory protection mechanisms while processing certain OSPF packets. An attacker could exploit this vulnerability by sending a series of malformed OSPF packets in a short period of time to an affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition for client traffic that is traversing the device.

  Cisco has released software updates that address the vulnerability described in this advisory. 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-asa-ftd-ospf-dos-RhMQY8qx

  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

  This vulnerability affects Cisco products that are running a vulnerable release of Cisco ASA Software or Cisco FTD Software that is configured to support OSPF routing with LLS block processing enabled. Note: LLS block processing is enabled by default.

  Determine Whether OSPF Routing Is Configured on an ASA Device

  To determine whether OSPF routing is configured on an ASA device, administrators can use the show ospf privileged mode command. If no output is returned, OSPF routing is not configured. In the following example, the device is configured for OSPF routing:

  asa# show ospf
  
  Routing Process “ospf 2” with ID 10.1.89.2 and Domain ID 0.0.0.2
  Supports only single TOS(TOS0) routes
  Supports opaque LSA
  .
  .
  .

  Determine Whether OSPF Routing Is Configured on an FTD Device

  To determine whether OSPF routing is configured on an FTD device, administrators can do one of the following:

  • For devices that are managed by using Cisco Firepower Management Center (FMC), choose Devices > Device Management, select the device of interest, and then choose Routing > OSPF. If either Process 1 or Process 2 has a check mark, OSPF is enabled on the device.
  • For devices that are managed by using Cisco Firepower Device Manager (FDM), choose Device > Advanced Configuration > View Configuration > Smart CLI > Routing. If there is an object with the type of OSPF, then OSPF is enabled on the device.

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

  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 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 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 vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

  Cisco ASA Software

  Cisco ASA Software Release	First Fixed Release for This Vulnerability	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  Earlier than 9.51	Not vulnerable.	Migrate to a fixed release.
  9.51	Not vulnerable.	Migrate to a fixed release.
  9.6	9.6.4.40	Migrate to a fixed release.
  9.71	Migrate to a fixed release.	Migrate to a fixed release.
  9.8	9.8.4.17	9.8.4.20
  9.9	9.9.2.66	9.9.2.67
  9.10	9.10.1.37	9.10.1.40
  9.12	9.12.3.7	9.12.3.9
  9.13	9.13.1.7	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 this vulnerability.

  Cisco FTD Software

  Cisco FTD Software Release	First Fixed Release for This Vulnerability	First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories
  Earlier than 6.1.01	Not vulnerable.	Migrate to a fixed release.
  6.1.0	Not vulnerable.	Migrate to a fixed release.
  6.2.0	Not vulnerable.	Migrate to a fixed release.
  6.2.1	Not vulnerable.	Migrate to a fixed release.
  6.2.2	Not vulnerable.	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	6.3.0.6 (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	6.3.0.6 (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	6.4.0.9	6.4.0.9
  6.5.0	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	6.5.0.5 (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 this vulnerability.

  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 vulnerability that is described in this advisory.

Source

• This vulnerability was found by Santosh Krishnamurthy of Cisco during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ospf-dos-RhMQY8qx

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
  1.0	Initial public release.	-	Final	2020-MAY-06
  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

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