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Anonymous FTP accounts must not have a functional shell.


Overview

Finding ID Version Rule ID IA Controls Severity
V-4387 GEN005000 SV-4387r2_rule ECCD-1 ECCD-2 High
Description
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.
STIG Date
UNIX SRG 2013-03-26

Details

Check Text ( C-8269r2_chk )
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 (F-4298r2_fix)
Configure anonymous FTP accounts to use a non-functional shell. 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, /dev/null.