Kerberos Improper Authentication Vulnerability

Summary

A vulnerability in the Kerberos authentication feature of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to impersonate the Kerberos key distribution center (KDC) and bypass authentication on an affected device that is configured to perform Kerberos authentication for VPN or local device access. 

Credit:

The information has been provided by Yoav Iellin

The original article can be found at:https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-asa-kerberos-bypass-96Gghe2sS


Details

The vulnerability is due to insufficient identity verification of the KDC when a successful authentication response is received. An attacker could exploit this vulnerability by spoofing the KDC server response to the ASA device. This malicious response would not have been authenticated by the KDC. A successful attack could allow an attacker to bypass Kerberos authentication.

 

Vulnerable Systems:

Kerberos

 

CVE Information:

CVE-2020-3125

 

Disclosure Timeline:
Published Date:5/6/2020

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