Title

If GSSAPI authentication is not required on AIX, the SSH daemon must disable GSSAPI authentication. (Cat II impact)

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 '^#' GSSAPIAuthentication no If the setting is not set to "no", this is a finding.

Fix Text

Edit "/etc/ssh/sshd_config" and remove the "GSSAPIAuthentication" setting or change the value to "no". Refresh sshd: # stopsrc -s sshd # startsrc -s sshd

Additional Identifiers

Rule ID: SV-215292r853474_rule

Vulnerability ID: V-215292

Group Title: SRG-OS-000373-GPOS-00158

Expert Comments

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