The SSH daemon must not permit GSSAPI authentication unless needed.

From SUSE Linux Enterprise Server v11 for System z

Associated with: CCI-000366

SV-46052r2_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 GSSAPIAuthentication setting. # grep -i GSSAPIAuthentication /etc/ssh/sshd_config | grep -v '^#' If no lines are returned, or the setting is set to "yes", this is a finding.

Fix text

Edit the SSH daemon configuration and set (add if necessary) a "GSSAPIAuthentication" directive set to "no". Restart the SSH daemon. # /sbin/service sshd restart

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.