The system must use SMB client signing for connecting to samba servers using smbclient.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-218024	RHEL-06-000272	SV-218024r505923_rule		Low

Description
Packet signing can prevent man-in-the-middle attacks which modify SMB packets in transit.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2020-09-03

Details

Check Text ( C-19505r377087_chk )
To verify that Samba clients running smbclient must use packet signing, run the following command: # grep signing /etc/samba/smb.conf The output should show: client signing = mandatory If it is not, this is a finding.

Fix Text (F-19503r377088_fix)
To require samba clients running "smbclient" to use packet signing, add the following to the "[global]" section of the Samba configuration file in "/etc/samba/smb.conf": client signing = mandatory Requiring samba clients such as "smbclient" to use packet signing ensures they can only communicate with servers that support packet signing.