Reserved UIDs 0-99 must only be used by system accounts.

From Solaris 11 X86 Security Technical Implementation Guide

Associated with: CCI-000366

SV-60949r4_rule Reserved UIDs 0-99 must only be used by system accounts.

Vulnerability discussion

If a user is assigned a UID that is in the reserved range, even if it is not presently in use, security exposures can arise if a subsequently installed application uses the same UID.

Check content

The root role is required. Check that reserved UIDs are not assigned to non-system users. # logins -so | awk -F: '{ print $1 }' | while read user; do found=0 for tUser in root daemon bin sys adm dladm netadm netcfg \ ftp dhcpserv sshd smmsp gdm zfssnap aiuser \ polkitd ikeuser lp openldap webservd unknown \ pkg5srv nobody noaccess nobody4; do if [ ${user} = ${tUser} ]; then found=1 fi done if [ $found -eq 0 ]; then echo "Invalid User with Reserved UID: ${user}" fi done If output is produced, this is a finding.

Fix text

The root role is required. Correct or justify any items discovered in the Check step. Determine if there are any accounts using these reserved UIDs, and work with their owners to determine the best course of action in accordance with site policy. This may require deleting users or changing UIDs for users.

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