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From 389d25be2b69e4e5c828d9b0b72573e0962cabb4 Mon Sep 17 00:00:00 2001
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From: Vojtech Polasek <vpolasek@redhat.com>
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Date: Wed, 13 Jan 2021 17:07:48 +0100
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Subject: [PATCH 1/4] add rule
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---
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.../sshd_x11_use_localhost/rule.yml | 43 +++++++++++++++++++
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shared/references/cce-redhat-avail.txt | 3 --
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2 files changed, 43 insertions(+), 3 deletions(-)
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create mode 100644 linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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diff --git a/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml b/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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new file mode 100644
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index 0000000000..67131e509c
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--- /dev/null
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+++ b/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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@@ -0,0 +1,43 @@
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+documentation_complete: true
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+
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+prodtype: fedora,ol7,rhel7
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+
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+title: 'Prevent remote hosts from connecting to the proxy display'
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+
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+description: |-
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+ The SSH daemon should prevent remote hosts from connecting to the proxy
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+ display. Make sure that the option <tt>X11UseLocalhost</tt> is set to
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+ <tt>yes</tt> within the SSH server configuration file.
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+
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+
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+rationale: |-
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+ When X11 forwarding is enabled, there may be additional exposure to the
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+ server and client displays if the sshd proxy display is configured to listen
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+ on the wildcard address. By default, sshd binds the forwarding server to the
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+ loopback address and sets the hostname part of the <tt>DISPLAY</tt>
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+ environment variable to localhost. This prevents remote hosts from
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+ connecting to the proxy display.
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+
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+severity: medium
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+
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+identifiers:
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+ cce@rhel7: CCE-83404-4
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+
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+references:
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+ srg: SRG-OS-000480-GPOS-00227
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+ stig@rhel7: RHEL-07-040711
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+ disa: CCI-000366
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+ nist: CM-6(b)
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+
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+ocil_clause: "the display proxy is listening on wildcard address"
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+
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+ocil: |-
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+ {{{ ocil_sshd_option(default="yes", option="X11UseLocalhost", value="yes") }}}
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+
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+template:
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+ name: sshd_lineinfile
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+ vars:
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+ missing_parameter_pass: 'false'
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+ parameter: X11UseLocalhost
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+ rule_id: sshd_x11_use_localhost
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+ value: 'yes'
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From a40b9e68305afb52c2c674848b71cbcaee25fe32 Mon Sep 17 00:00:00 2001
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From: Vojtech Polasek <vpolasek@redhat.com>
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Date: Wed, 13 Jan 2021 17:08:08 +0100
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Subject: [PATCH 2/4] add rule to the stig profile
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---
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rhel7/profiles/stig.profile | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/rhel7/profiles/stig.profile b/rhel7/profiles/stig.profile
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index 88b50d5ef4..817e0982e5 100644
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--- a/rhel7/profiles/stig.profile
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+++ b/rhel7/profiles/stig.profile
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@@ -286,6 +286,7 @@ selections:
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- package_vsftpd_removed
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- package_tftp-server_removed
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- sshd_enable_x11_forwarding
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+ - sshd_x11_use_localhost
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- tftpd_uses_secure_mode
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- package_xorg-x11-server-common_removed
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- xwindows_runlevel_target
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From be2f96b80fbfb74708381e15a2a6e76c3952bbb5 Mon Sep 17 00:00:00 2001
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From: vojtapolasek <krecoun@gmail.com>
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Date: Fri, 15 Jan 2021 07:46:09 +0100
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Subject: [PATCH 4/4] Update
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linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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Co-authored-by: Gabriel Becker <ggasparb@redhat.com>
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---
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.../services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml b/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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index 67131e509c..7267d2443a 100644
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--- a/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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+++ b/linux_os/guide/services/ssh/ssh_server/sshd_x11_use_localhost/rule.yml
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@@ -37,7 +37,7 @@ ocil: |-
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template:
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name: sshd_lineinfile
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vars:
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- missing_parameter_pass: 'false'
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+ missing_parameter_pass: 'true'
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parameter: X11UseLocalhost
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rule_id: sshd_x11_use_localhost
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value: 'yes'
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