Summary

• A vulnerability in the authentication module of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass local authentication.
  
  The vulnerability is due to improper handling of authentication requests and policy assignment for externally authenticated users. An attacker could exploit this vulnerability by authenticating with a valid external user account that matches an internal username and incorrectly receiving the authorization policy of the internal account. An exploit could allow the attacker to have Super Admin privileges for the ISE Admin portal.
  
  This vulnerability does not affect endpoints authenticating to the ISE.
  
  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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-ise

Affected Products

• Vulnerable Products

  The vulnerability affects the following Cisco Identity Services Engine (ISE) products running Release 1.3, 1.4, 2.0.0, 2.0.1, or 2.1.0.  Release 2.2.x is not affected.
  

  • Cisco ISE
  • Cisco ISE Express
  • Cisco ISE Virtual Appliance

  To determine which release of the software is currently running on a device, administrators may use the show version command in the device CLI or navigate to the top right corner and click Settings (gear icon) > About Identity Service Engine in the Admin portal. The output of the command in the CLI is similar to the following example:
  
  

  ServiceEngine115/admin# show version 
  
  Cisco Application Deployment Engine OS Release: 2.3
  ADE-OS Build Version: 2.3.0.187
  ADE-OS System Architecture: x86_64
  
  Copyright (c) 2005-2014 by Cisco Systems, Inc.
  All rights reserved.
  Hostname: ServiceEngine115
  
  
  Version information of installed applications
  ---------------------------------------------
  
  Cisco Identity Services Engine
  ---------------------------------------------
  Version      : 2.0.0.306
  Build Date   : Thu Oct  8 13:25:23 2015
  Install Date : Tue Nov 17 21:02:22 2015     
  
  Cisco Identity Services Engine Patch 
  ---------------------------------------------
  Version      : 5
  Install Date : Fri Jul 07 01:57:01 2017

  
  

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.
  
  Cisco has confirmed that this vulnerability does not affect Cisco ISE Passive Identity Connector.

Details

• This vulnerability requires the configured ISE Admin portal to use an external identity source for authentication. This extends to any external identity source that can provide external groups supported by ISE.

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:
  http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.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:
  http://www.cisco.com/en/US/support/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 should upgrade to an appropriate release as indicated in the following table:

  Cisco Identity Services Engine Release	First Fixed Release for This Vulnerability
  1.3.0	Affected; migrate to 1.4
  1.4.0	1.4.0 Patch 11
  2.0.0	2.0.0 Patch 5
  2.0.1	2.0.1 Patch 5 (see note)
  2.1.0	2.1.0 Patch 2
  2.2.x	Not affected

  
  Note: Software Release 2.0.1 Patch 5 is currently not posted. Until this release is posted, please migrate to a fixed release.

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 internally.

URL

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-ise

Revision History

• Version	Description	Section	Status	Date
  1.1	Metadata update.	—	Final	2018-September-24
  1.0	Initial public release.	—	Final	2017-August-02

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