SV-37820r1: The SSH client must be configured to only use the SSHv2 protocol. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The SSH client must be configured to only use the SSHv2 protocol.

Description

Discussion Text

SSHv1 is not a DoD-approved protocol and has many well-known vulnerability exploits. Exploits of the SSH client could provide access to the system with the privileges of the user running the client.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001436

Additional Details

Responsibility

System Administrator

IA Controls

DCPP-1

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.fso.rhel11:def:329
# The SSH client must be configured to only use the SSHv2 protocol.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ 	

]*[Pp][Rr][Oo][Tt][Oo][Cc][Oo][lL][ 	

]*2[ 	

]*$' '/etc/ssh/ssh_config' &>/dev/null
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.fso.rhel11:def:329

if [ ! -f "/etc/ssh/ssh_config" ]; then echo "PASS"; exit 0; fi
if grep -q "^[ \t\n\r]*[Pp][Rr][Oo][Tt][Oo][Cc][Oo][lL][ \t\n\r]*2[ \t\n\r]*$" /etc/ssh/ssh_config; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Edit the /etc/ssh/ssh_config file and add or edit a "Protocol" configuration line not allowing versions less than 2.