Summary

• A vulnerability in Cisco NX-OS Software and Cisco IOS XE Software could allow an authenticated, local attacker with valid administrator or privilege level 15 credentials to load a virtual service image and bypass signature verification on an affected device.
  
  The vulnerability is due to improper signature verification during the installation of an Open Virtual Appliance (OVA) image. An authenticated, local attacker could exploit this vulnerability and load a malicious, unsigned OVA image on an affected device. A successful exploit could allow an attacker to perform code execution on a crafted software OVA image.
  

  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-20190925-vman

Affected Products

• Vulnerable Products

  At the time of publication, this vulnerability affected the following Cisco devices if they were running a vulnerable release of Cisco NX-OS Software:

  Cisco NX-OS Products

  • Nexus 3000 Series Switches
  • Nexus 3500 Platform Switches
  • Nexus 5500 Platform Switches
  • Nexus 5600 Platform Switches
  • Nexus 6000 Series Switches
  • Nexus 7000 Series Switches
  • Nexus 7700 Series Switches
  • Nexus 9000 Series Switches in standalone NX-OS mode
  • Nexus 9500 R-Series Switching Platform

  Cisco IOS XE Software

  This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS XE Software.

  Vulnerable releases of Cisco IOS XE Software are tracked via the Cisco IOS Software Checker.

  For information about which Cisco NX-OS or IOS XE Software releases were vulnerable at the time of publication, see 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 products:

  • Firepower 2100 Series Firewalls
  • Firepower 4100 Series Next-Generation Firewall
  • Firepower 9300 Security Appliance
  • MDS 9000 Series Multilayer Switches
  • Nexus 1000V Series Switches
  • Nexus 3600 Platform Switches
  • Nexus 9000 Series Fabric Switches in standalone ACI mode
  • UCS 6200 Series Fabric Interconnects
  • UCS 6300 Series Fabric Interconnects
  • UCS 6400 Series Fabric Interconnects

  Cisco has confirmed that this vulnerability does not affect Cisco IOS Software or Cisco IOS XR Software.

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• 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.

  Fixed Releases

  For Cisco NX-OS Software releases, refer to the following tables:

  Nexus 3000 Series Switches and Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCve53538

  Cisco NX-OS Software Release	First Fixed Release for This Vulnerability
  Earlier than 7.0(3)I4	7.0(3)I4(8)
  7.0(3)I4	7.0(3)I4(8)
  7.0(3)I5	7.0(3)I6(2)
  7.0(3)I6	7.0(3)I6(2)
  7.0(3)I7	Not vulnerable
  9.2	Not vulnerable
  9.3	Not vulnerable

  Nexus 3500 Platform Switches: CSCve53538

  Cisco NX-OS Software Release	First Fixed Release for This Vulnerability
  Earlier than 6.0(2)A8	6.0(2)A8(7)
  6.0(2)A8	6.0(2)A8(7)
  7.0(3)I7	Not vulnerable
  9.2	Not vulnerable
  9.3	Not vulnerable

  Nexus 5500, 5600, and 6000 Series Switches: CSCve53538

  Cisco NX-OS Software Release	First Fixed Release for This Vulnerability
  Earlier than 7.0	Not vulnerable
  7.0	7.1(5(N1(1b)
  7.1	7.1(5(N1(1b)
  7.2	7.1(5(N1(1b)
  7.3	7.3(3)N1(1)

  Nexus 7000 and 7700 Series Switches: CSCve53538

  Cisco NX-OS Software Release	First Fixed Release for This Vulnerability
  Earlier than 6.2	Not vulnerable
  6.2	7.3(2)D1(1)
  7.2	7.3(2)D1(1)
  7.3	7.3(2)D1(1)
  8.0	8.1(2)
  8.1	8.1(2)
  8.2	Not vulnerable
  8.3	Not vulnerable
  8.4	Not vulnerable

  Nexus 9500 R-Series Switching Platform: CSCve93259

  Cisco NX-OS Software Release	First Fixed Release for This Vulnerability
  7.0(3)	7.0(3)F3(1)
  9.2	Not vulnerable
  9.3	Not vulnerable

  For detailed information about affected and fixed Cisco IOS XE Software releases, consult the Cisco IOS Software Checker.

  Cisco IOS and IOS XE Software

  To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker, that identifies any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (“Combined First Fixed”).

  Customers can use this tool to perform the following tasks:

  • Initiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse
  • Enter the output of the show version command for the tool to parse
  • Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication

  To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S-in the following field:

  By default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list.

  For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the Cisco IOS XE Software 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 during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-vman

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2019-September-25

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