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The ftpusers file must not have an extended ACL.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22445 GEN004950 SV-37544r1_rule ECLP-1 Medium
Description
Excessive permissions on the ftpusers file could permit unauthorized modification. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized users to access the FTP service.
STIG Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide 2017-03-01

Details

Check Text ( C-36200r1_chk )
Check the permissions of the /etc/ftpusers file.
# ls -lL /etc/ftpusers /etc/vsftpd.ftpusers /etc/vsftpd/ftpusers
If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text (F-31459r1_fix)
Remove the extended ACL from the file.
# setfacl --remove-all /etc/ftpusers /etc/vsftpd.ftpusers /etc/vsftpd/ftpusers