Summary

• A vulnerability in Cisco Integrated Management Controller (IMC) Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data could allow an unauthenticated, remote attacker to log in to the CLI of an affected system by using the SCP User account (scpuser), which has default user credentials.

  The vulnerability is due to the presence of a documented default account with an undocumented default password and incorrect permission settings for that account. Changing the default password for this account is not enforced during the installation of the product. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to execute arbitrary commands with the privileges of the scpuser account. This includes full read and write access to the system's database.

  Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-usercred

Affected Products

• Vulnerable Products

  This vulnerability affects the following Cisco products:

  Cisco IMC Supervisor releases:

  • 2.1
  • 2.2.0.0 through 2.2.0.6

  Cisco UCS Director releases:

  • 6.0
  • 6.5
  • 6.6.0.0 and 6.6.1.0
  • 6.7.0.0 and 6.7.1.0

  Cisco UCS Director Express for Big Data releases:

  • 3.0
  • 3.5
  • 3.6
  • 3.7.0.0 and 3.7.1.0

  Products Confirmed Not Vulnerable

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

Workarounds

• Setting a custom password for the scpuser account under Administration > Users and Groups > SCP User Configuration will prevent exploitation of 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

  Cisco fixed this vulnerability in the following software releases:

  • Cisco Integrated Management Controller Supervisor releases 2.2.1.0 and later
  • Cisco UCS Director releases 6.7.2.0 and later (recommended: 6.7.3.0)
  • Cisco UCS Director Express for Big Data releases 3.7.2.0 and later (recommended: 3.7.3.0)

  Customers can download the Cisco IMC Supervisor software from the Software Center on Cisco.com by doing the following:

  1. Click Browse all.
  2. Choose Servers - Unified Computing > Integrated Management Controller (IMC) Supervisor > IMC Supervisor 2.x.
  3. Access releases by using the left pane of the IMC Supervisor 2.x page.

  Customers can download the Cisco UCS Director software from the Software Center on Cisco.com by doing the following:

  1. Click Browse all.
  2. Choose Servers - Unified Computing > UCS Director > UCS Director 6.7.
  3. Access releases by using the left pane of the UCS Director 6.7 page.

  Customers can download the Cisco UCS Director Express for Big Data software from the Software Center on Cisco.com by doing the following:

  1. Click Browse all.
  2. Choose Servers - Unified Computing > UCS Director > UCS Director Express for Big Data 3.7.
  3. Access releases by using the left pane of the UCS Director Express for Big Data 3.7 page.

Exploitation and Public Announcements

• Security researcher Pedro Ribeiro has published details on this vulnerability in his GitHub repository and has also released corresponding Metasploit modules.

Source

• Cisco would like to thank independent security researcher Pedro Ribeiro for reporting this vulnerability to iDefense's Vulnerability Contributor Program.
  

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-usercred

Revision History

• Version	Description	Section	Status	Date
  1.1	Updated the public announcement and availability of public exploit code.	Exploitation and Public Announcements	Final	2019-August-30
  1.0	Initial public release.	-	Final	2019-August-21

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