The SSH daemon must not permit Kerberos authentication unless needed.

From AIX 6.1 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-40716r1_rule The SSH daemon must not permit Kerberos authentication unless needed.

Vulnerability discussion

Kerberos authentication for SSH is often implemented using GSSAPI. If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled for systems not using this capability.

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Fix text

Edit the /etc/ssh/sshd_config file and remove the KerberosAuthentication setting or change the value of the setting to "no".

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