CVE-2019-1813: Cisco Security Advisory: Cisco NX-OS CLI Command Software Image Signature Verification Vulnerabilities

Cisco has released free software updates that address the vulnerabilities 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 an appropriate release as indicated in the applicable table in this section. In the following tables, the left column lists Cisco NX-OS Software releases. The right column indicates the first release that includes the fix for these vulnerabilities.

Note: A complete fix for these vulnerabilities requires that a proper BIOS version is installed. Customers who are running an affected product that is listed in the previously disclosed Cisco advisory cisco-sa-20190306-nxos-sig-verif may not have upgraded the BIOS when the software was installed even if they are running a fixed software release. Customers are advised to confirm that the BIOS is running a fixed BIOS version (first fixed or later) as described in the previously disclosed advisory.

Nexus 3000 Series Switches: CSCvj14182, CSCvj14106, CSCvj14093

Cisco NX-OS Software Release

First Fixed Release for These Vulnerabilities

Prior to 6.0(2)

Not vulnerable

6.0(2)

Not vulnerable

Prior to 7.0(3)I4

7.0(3)I7(5)

7.0(3)I4

7.0(3)I7(5)

7.0(3)I5

7.0(3)I7(5)

7.0(3)I6

7.0(3)I7(5)

7.0(3)I7

7.0(3)I7(5)

9.2

9.2(2)

Nexus 3600 Platform Switches and Nexus 9500 R-Series Switching Platform: CSCvk53256, CSCvk53227, CSCvk53125

Cisco NX-OS Software Release

First Fixed Release for These Vulnerabilities

7.0(3)F3

7.0(3)F3(5)

9.2

9.2(2)

Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvj14182, CSCvj14106, CSCvj14093

Cisco NX-OS Software Release

First Fixed Release for These Vulnerabilities

Prior to 7.0(3)I4

7.0(3)I7(5)

7.0(3)I4

7.0(3)I7(5)

7.0(3)I5

7.0(3)I7(5)

7.0(3)I6

7.0(3)I7(5)

7.0(3)I7

7.0(3)I7(5)

9.2

9.2(2)

Additional Resources

For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, administrators can refer to the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.

Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches

For help determining the best Cisco NX-OS Software release for Cisco UCS, refer to the Recommended Releases documents in the release notes for the device.