The SSH client must be configured to not allow TCP forwarding.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22465	GEN005516	SV-46027r1_rule	ECSC-1	Low

Description
SSH TCP connection forwarding provides a mechanism to establish TCP connections proxied by the SSH server. This function can provide similar convenience to a Virtual Private Network (VPN) with the similar risk of providing a path to circumvent firewalls and network ACLs. If this function is necessary to support a valid mission requirement, its use must be authorized and approved in the system accreditation package.

Description

SSH TCP connection forwarding provides a mechanism to establish TCP connections proxied by the SSH server. This function can provide similar convenience to a Virtual Private Network (VPN) with the similar risk of providing a path to circumvent firewalls and network ACLs. If this function is necessary to support a valid mission requirement, its use must be authorized and approved in the system accreditation package.

STIG	Date
SUSE Linux Enterprise Server v11 for System z	2012-12-13

Details

Check Text ( C-43298r1_chk )
Check the SSH client configuration for the TCP forwarding setting. # grep -i AllowTCPForwarding /etc/ssh/ssh_config \| grep -v '^#' If no lines are returned, or the returned setting has a value evaluating to "yes", this is a finding.

Fix Text (F-39387r1_fix)
Edit the SSH client configuration and change or add the "AllowTCPForwarding" setting to "no".