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V-4387

CAT I (High)

Anonymous FTP accounts must not have a functional shell.

Rule ID

SV-45886r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000225

Discussion

If an anonymous FTP account has been configured to use a functional shell, attackers could gain access to the shell if the account is compromised.

Check Content

Check the shell for the anonymous FTP account.

Procedure:
# grep "^ftp" /etc/passwd

This is a finding if the seventh field is empty (the entry ends with a ':') or if the seventh field does not contain one of the following:

/bin/false
/dev/null
/usr/bin/false
/bin/true
/sbin/nologin

Fix Text

Configure anonymous FTP accounts to use a non-functional shell. The Yast ‘Security and Users’ > ‘User and Group Management’ module can be used to configure the account.  Or if necessary, edit the /etc/passwd file to remove any functioning shells associated with the ftp account and replace them with non-functioning shells, such as /bin/false.