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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22465	GEN005516	SV-26758r1_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
UNIX SRG	2013-03-26

Details

Check Text ( C-27767r1_chk )
Check the SSH client configuration for the TCP forwarding setting. # egrep -i "LocalForward\|RemoteForward" /etc/ssh/ssh_config \| grep -v '^#' If any uncommented lines are returned, this is a finding.

Fix Text (F-24008r1_fix)
Edit the SSH client configuration and change or add the AllowTCPForwarding setting to no.