Accounts must be locked upon 35 days of inactivity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-918	GEN000760	SV-918r2_rule	IAAC-1	Medium

Description
On some systems, accounts with disabled passwords still allow access using rcp, remsh, or rlogin through equivalent remote hosts. All that is required is the remote host name and the user name match an entry in a hosts.equiv file and have a .rhosts file in the user directory. Using a shell called /bin/false or /dev/null (or an equivalent) will add a layered defense. Non-interactive accounts on the system, such as application accounts, may be documented exceptions.

Description

On some systems, accounts with disabled passwords still allow access using rcp, remsh, or rlogin through equivalent remote hosts. All that is required is the remote host name and the user name match an entry in a hosts.equiv file and have a .rhosts file in the user directory. Using a shell called /bin/false or /dev/null (or an equivalent) will add a layered defense. Non-interactive accounts on the system, such as application accounts, may be documented exceptions.

STIG	Date
UNIX SRG	2013-03-26

Details

Check Text ( C-462r2_chk )
Indications of inactive accounts are those without entries in the last log. Check the date in the last log to verify it is within the last 35 days. If an inactive account is not disabled via an entry in the password field in the /etc/passwd or /etc/shadow (or equivalent), check the /etc/passwd file to check if the account has a valid shell. If an inactive account is found that is not disabled, this is a finding.

Check Text ( C-462r2_chk )

Indications of inactive accounts are those without entries in the last log. Check the date in the last log to verify it is within the last 35 days. If an inactive account is not disabled via an entry in the password field in the /etc/passwd or /etc/shadow (or equivalent), check the /etc/passwd file to check if the account has a valid shell. If an inactive account is found that is not disabled, this is a finding.

Fix Text (F-1072r2_fix)
All inactive accounts will have /bin/false, /usr/bin/false, or /dev/null as the default shell in the /etc/passwd file and have the password disabled. Disable the inactive accounts. Examine the inactive accounts using the last command. Note the date of last login for each account. If any (other than system and application accounts) exceed 35 days, then disable them by placing a shell of /bin/false or /dev/null in the shell field of the passwd file entry for that account. An alternative, and preferable method, is to disable the account using SAM, SMIT, or ADMINTOOL.

Fix Text (F-1072r2_fix)

All inactive accounts will have /bin/false, /usr/bin/false, or /dev/null as the default shell in the /etc/passwd file and have the password disabled. Disable the inactive accounts. Examine the inactive accounts using the last command. Note the date of last login for each account. If any (other than system and application accounts) exceed 35 days, then disable them by placing a shell of /bin/false or /dev/null in the shell field of the passwd file entry for that account. An alternative, and preferable method, is to disable the account using SAM, SMIT, or ADMINTOOL.