Summary

• A vulnerability in the command-line interface of Cisco Integrated Management Controller (IMC) could allow an authenticated, local attacker with read-only credentials to inject arbitrary commands that could allow them to obtain root privileges.

  The vulnerability is due to insufficient validation of user-supplied input on the command-line interface. An attacker could exploit this vulnerability by authenticating with read-only privileges via the CLI of an affected device and submitting crafted input to the affected commands. A successful exploit could allow an attacker to execute arbitrary commands on the device with root privileges.

  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-20190821-cimc-cli-inject

Affected Products

• Vulnerable Products

  This vulnerability affects the following Cisco products:

  • UCS C-Series and S-Series Servers in standalone mode that are running Cisco IMC Software earlier than the first fixed releases of 3.0 and 4.0.
  • UCS E-Series Servers that are running Cisco IMC Software earlier than the first fixed release of 3.2(8).
  • 5000 Series Enterprise Network Compute System (ENCS) Platforms that are running Cisco IMC Software earlier than the first fixed release of 3.2(8).

  For information about affected software releases, consult 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 the following Cisco FI-Attached servers managed by UCS Manager:

  • Cisco UCS B-Series Servers
  • Cisco UCS C-Series Servers
  • Cisco UCS S-Series Servers

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 the appropriate UCS C-Series and S-Series software release as indicated in the following table:

  Cisco IMC Software Release	First Fixed Release
  1.4	Not vulnerable
  1.5	Not vulnerable
  2.0	Not vulnerable
  3.0	3.0(4k)
  4.0	4.0(2f),4.0(4b)

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

  1. Click Browse all.
  2. Navigate to Servers - Unified Computing > UCS C-Series Rack-Mount Standalone Server Software.
  3. In the right pane, choose the appropriate Cisco UCS C-Series platform.
  4. On the Select a Software Type page, click Unified Computing System (UCS) Server Firmware.
  5. Access releases by using the left pane of the page.

  Cisco fixed this vulnerability in Cisco IMC Software Release 3.2(8) for Cisco UCS E-Series Servers.

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

  1. Click Browse all.
  2. Navigate to Servers - Unified Computing > UCS E-Series Software.
  3. In the right pane, choose the appropriate Cisco UCS E-Series platform.
  4. On the Select a Software Type page, click Unified Computing System (UCS) Server Firmware.
  5. Access releases by using the left pane of the page.

  Cisco fixed this vulnerability in Cisco IMC Software Release 3.2(8) for Cisco 5000 Series Enterprise Network Compute System (ENCS) Platforms.

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

  1. Click Browse all.
  2. Navigate to Routers > Network Functions Virtualization > 5000 Series Enterprise Network Compute System.
  3. In the right pane, choose the appropriate ENCS platform.
  4. On the Select a Software Type page, click ENCS Software.
  5. Access releases by using the left pane of the page.

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 during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-cimc-cli-inject

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2019-August-21

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