Summary

• On April 24, 2018, researchers disclosed a vulnerability that takes advantage of a buffer overflow vulnerability in NVIDIA TX1 BootROM when Recovery Mode (RCM) is active. This vulnerability could allow an unprivileged, local attacker to bypass secure boot and execute unverified code on an affected system.

  The vulnerability has been identified by CVE-2018-6242.

  To exploit this vulnerability, an attacker must be able to physically access the device along with the affected processor’s USB connection. This vulnerability cannot be exploited remotely, even if the device is connected to the Internet.

  Cisco has identified all products that use the NVIDIA TX1 processor and has released software updates to address this vulnerability. The software update will permanently disable the ability to activate RCM. Should customers attempt to downgrade their software version, the ability to activate RCM will no longer be available.

  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-20180620-nvidia-tx1-rom

Affected Products

• Cisco has investigated its product line to determine which products may be affected by this vulnerability.

  Any product not listed in the Vulnerable Products section of this advisory is to be considered not vulnerable.

  Vulnerable Products

  The following table lists Cisco products that are affected by the vulnerability described in this advisory:

  Product	Cisco Bug ID	Fixed Release Availability
  Collaboration Endpoints
  Cisco WebEx Room 55	CSCvj27020	CE9.2.6 (Available) CE9.3.2 (Available)
  Cisco WebEx Room 70 Single/Dual	CSCvj27020	CE9.2.6 (Available) CE9.3.2 (Available)
  Cisco WebEx Room Kit	CSCvj27020	CE9.2.6 (Available) CE9.3.2 (Available)
  Cisco WebEx Room Kit Plus	CSCvj27020	CE9.2.6 (Available) CE9.3.2 (Available)
  Cloud-Based Deployments
  RoomOS	CSCvj27020	RoomOS 2018-06-01 608dcdbb6e1

  Note: Collaboration Endpoints are installed on-premises for customer deployments. RoomOS is an alternate software offering for the same products, but via cloud-based deployments (e.g., Cisco WebEx cloud subscriptions). Cisco controls the push of the software to these units, which have either already received the patch via software updates, or will receive the update the next time the device is powered on and online.

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
  
  No other Cisco products are currently known to be affected by this vulnerability.

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• For information about fixed software releases, see the Vulnerable Products section of this advisory

  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.

Exploitation and Public Announcements

• The vulnerability described in this advisory was discussed in several articles and discussion forums as of April 24, 2018.
  
  The Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.

URL

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-nvidia-tx1-rom

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2018-June-20

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