Cisco Prime Infrastructure and Evolved Programmable Network Manager XML Injection Vulnerability

Summary

• A vulnerability in the web-based user interface of Cisco Prime Infrastructure (PI) and Evolved Programmable Network Manager (EPNM) could allow an authenticated, remote attacker read and write access to information stored in the affected system as well as perform remote code execution. The attacker must have valid user credentials.
  
  The vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing an XML file. An attacker could exploit this vulnerability by convincing the administrator of an affected system to import a crafted XML file with malicious entries which could allow the attacker to read and write files and execute remote code within the application.
  
  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-20170621-piepnm1

Affected Products

• Vulnerable Products

  Cisco Prime Infrastructure
  
  Cisco Prime Infrastructure software releases 1.1 through 3.1.6 are vulnerable. To determine the software release that is running on the appliance, administrators can use the following methods.
  

  1. The administrator can issue the show version command from the console CLI. The following output is from an affected application running PI software release 3.1.0 with the PI Maintenance Release 3.1.6 installed:

  piconsole# show version
  Cisco Application Deployment Engine OS Release: 3.1
  ADE-OS Build Version: 3.1.0.001
  ADE-OS System Architecture: x86_64
  
  Copyright (c) 2009-2016 by Cisco Systems, Inc.
  All rights reserved.
  Hostname: lmpy-spc-princess
  
  Version information of installed applications
  ---------------------------------------------
  
  Cisco Prime Infrastructure
  ********************************************************
  Version : 3.1.0
  Build : 3.1.0.0.132
  Critical Fixes:
          PI 3.1.6 Maintenance Release ( 6.0.0 )
  Device Support:
          Prime Infrastructure 3.1 Device Pack 11 ( 11.0 )
  

  2. The administrator can view the PI release and maintenance release updates by connecting to the web interface using the http(s):// access URL. The PI software release is displayed on the welcome screen and the administrator can click View Installed Update, which opens a pop-up window with the list of PI maintenance releases and patches. The following is an example of text that is displayed in the pop-up window for PI software release 3.1:

     Cisco Prime Infrastructure
            Version 3.1
        View Installed Update

     The pop-up window will display the list of maintenance release updates in the format:
     

     Update Name
     PI 3.1.6 Maintenance Release

  3. The administrator can also view the PI release and maintenance releases by logging in to the web interface using the http(s):// access URL and navigating to the Gear > About Prime Infrastructure > View Installed Updates screen. The release information is displayed as follows:
     

     Installed Updates
     
     Critical Fixes
      Update Name            Version
      PI 3.1.6 Maintenance Rel...    6.0.0
     
     Device Support
      Update Name            
      Prime Infrastructure 3.1

  Cisco Evolved Programmable Network Manager
  
  Cisco EPNM software releases 1.2, 2.0, and 2.1 are vulnerable.

  Products Confirmed Not Vulnerable

  No other Cisco products are currently known to be affected by this vulnerability.

Indicators of Compromise

• No indicators of compromise have been identified for 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: 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

  Cisco Prime Infrastructure

  Cisco Prime Infrastructure Major Release	First Fixed Release for This Vulnerability
  Prior to 2.2.3	Vulnerable; migrate to 3.1.6 Update 1
  2.2.3	Vulnerable; migrate to 3.1.6 Update 1
  3.0	Vulnerable; migrate to 3.1.6 Update 1
  3.1	3.1.6 Update 1 3.1.7 (future release)
  3.2	Not vulnerable (future release)

  
  

  Software Download

  The Cisco Prime Infrastructure software can be downloaded from the Software Center on Cisco.com by visiting Download Software and choosing Downloads Home > Products > Cloud and Systems Management > Routing and Switching Management > Network Management Solutions > Prime Infrastructure.

  For more information about upgrading Cisco Prime Infrastructure software please review Readme for Installing Security Fix Software for the Cisco Prime Infrastructure Appliance.

  Cisco Evolved Programmable Network Manager

  Cisco Evolved Programmable Network Manager	First Fixed Release for This Vulnerability
  1.2	Vulnerable; migrate to 2.1 MP2 (future release)
  2.0	Vulnerable; migrate to 2.1 MP2 (future release)
  2.1	Vulnerable; migrate to 2.1 MP2 (future release)

  
  

  Software Download

  The Cisco Evolved Programmable Network Manager software it can be downloaded from the Software Center on Cisco.com by visiting Download Software and choosing Downloads Home > Products > Cloud and Systems Management > Routing and Switching Management > Evolved Programmable Network Manager > Evolved Programmable Network Manager 2.1.

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

• Cisco would like to thank Pichaya Morimoto (discovery, analysis, coordination) from the SEC Consult Vulnerability Lab for responsibly reporting the identified vulnerability.

URL

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-piepnm1

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2017-June-21

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