Summary

• A vulnerability in the configuration of the Pluggable Authentication Module (PAM) used in Cisco Firepower Threat Defense (FTD) Software, Cisco Firepower Management Center (FMC) Software, and Cisco FXOS Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition.

  The vulnerability is due to improper resource management in the context of user session management. An attacker could exploit this vulnerability by connecting to an affected system and performing many simultaneous successful Secure Shell (SSH) logins. A successful exploit could allow the attacker to exhaust system resources and cause the device to reload, resulting in a DoS condition. To exploit this vulnerability, the attacker needs valid user credentials on the system.

  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-20191002-ftd-fpmc-dos

Affected Products

• Vulnerable Products

  This vulnerability affects Cisco FTD Software, FMC Software, and FXOS Software running on any Cisco product.

  For information about which Cisco FTD Software, FMC Software, and FXOS 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.

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

  Customers are advised to upgrade to an appropriate release as indicated in the applicable table in this section.

  In the following tables, the left column lists releases of Cisco FTD Software, FMC Software, or FXOS Software. The right 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.

  Cisco FTD Software and FMC Software

  Cisco FTD Software and FMC Software Running on Firepower 1000/2100 Series

  Cisco FTD/FMC Software Release (Firepower 1000/2100 Series)	First Fixed Release for This Vulnerability
  6.1.0 and earlier	6.2.3.14
  6.2.0	6.2.3.14
  6.2.1	6.2.3.14
  6.2.2	6.2.3.14
  6.2.3	6.2.3.14
  6.3.0	Not vulnerable
  6.4.0	Not vulnerable
  6.5.0	Not vulnerable

  Cisco FTD Software and FMC Software Running on Any Other Platform

  Cisco FTD/FMC Software Release (Other Platforms)	First Fixed Release for This Vulnerability
  6.1.0 and earlier	6.2.2.5
  6.2.0	6.2.2.5
  6.2.1	6.2.2.5
  6.2.2	6.2.2.5
  6.2.3	6.2.3.7
  6.3.0	Not vulnerable
  6.4.0	Not vulnerable
  6.5.0	Not vulnerable

  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.

  Cisco FXOS Software

  Cisco FXOS Software Release	First Fixed Release for This Vulnerability
  2.2 and earlier	2.2.2.101
  2.3	2.3.1.155
  2.4	2.6.1.131
  2.6	2.6.1.131

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 Sanmith Prakash of Cisco during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-ftd-fpmc-dos

Revision History

• Version	Description	Section	Status	Date
  1.1	Updated first fixed release for FXOS 2.2 and earlier.	Fixed Software	Final	2019-October-09
  1.0	Initial public release.	—	Final	2019-October-02

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