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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-45884r1_rule 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
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-43201r1_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-39262r1_fix)
Remove the extended ACL from the file.
# setfacl --remove-all /etc/ftpusers /etc/vsftpd.ftpusers /etc/vsftpd/ftpusers