CVE-2020-3125: Cisco Security Advisory: Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass Vulnerability

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

In the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

Cisco ASA Software

Cisco ASA Software Release

First Fixed Release for This Vulnerability

First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

Earlier than 9.61

Migrate to a fixed release.

Migrate to a fixed release.

9.6

Migrate to a fixed release.

Migrate to a fixed release.

9.71

Migrate to a fixed release.

Migrate to a fixed release.

9.8

9.8.4.15

9.8.4.20

9.9

9.9.2.66

9.9.2.67

9.10

9.10.1.37

9.10.1.40

9.12

9.12.3.2

9.12.3.9

9.13

9.13.1.7

9.13.1.10

9.14

Not vulnerable.

Not vulnerable.

1. Cisco ASA Software releases 9.5 and earlier, as well as Release 9.7, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.

Note 1: This vulnerability is fixed in Cisco ASA Software releases 9.8 and later through a new set of configuration commands. Cisco ASA devices are vulnerable and can still be exploited unless the CLI commands validate-kdc and aaa kerberos import-keytab are configured. For more information, see the Details section of this advisory.

Note 2: Cisco does not recommend that customers use Kerberos authentication if the Kerberos authentication server is outside of the known, trusted network for any Cisco ASA Software release unless the validate-kdc and aaa kerberos import-keytab commands have been configured.