The SSH daemon must not permit GSSAPI authentication unless needed.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-40714r1_rule The SSH daemon must not permit GSSAPI authentication unless needed.

Vulnerability discussion

GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system’s GSSAPI to remote hosts, increasing the attack surface of the system. GSSAPI authentication must be disabled unless needed.

Check content

Ask the SA if GSSAPI authentication is used for SSH authentication to the system. If so, this is not applicable. Check the SSH daemon configuration for the GSSAPI authentication setting. # grep -i GSSAPIAuthentication /etc/ssh/sshd_config | grep -v '^#' If the setting is present and set to "yes", this is a finding. If the setting is absent or set to "no", this is not a finding.

Fix text

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

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