Title

The SSH daemon must be configured for IP filtering. (Cat II impact)

Discussion

The SSH daemon must be configured for IP filtering to provide a layered defense against connection attempts from unauthorized addresses.

Check Content

Check the TCP wrappers configuration files to determine if SSHD is configured to use TCP wrappers. Procedure: # egrep '^[^#:]*(ALL|sshd)' /etc/hosts.deny # egrep '^[^#:]*(ALL|sshd)' /etc/hosts.allow If neither of the hosts.deny or hosts.allow files exist, this is a finding. If no entries are returned, the TCP wrappers are not configured for SSHD, this is a finding.

Fix Text

Add appropriate IP restrictions for SSH to the /etc/hosts.deny and/or /etc/hosts.allow files.

Additional Identifiers

Rule ID: SV-227907r603266_rule

Vulnerability ID: V-227907

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.