All Automation Controller NGINX web servers must have Web Distributed Authoring (WebDAV) disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256950	APWS-AT-000340	SV-256950r902364_rule		Medium

Description
Automation Controller NGINX web servers can be installed with functionality that, just by its nature, is not secure. Web Distributed Authoring (WebDAV) is an extension to the HTTP protocol that, when developed, was meant to allow users to create, change, and move documents on a server, typically a web server or web share. Allowing this functionality, development, and deployment is much easier for web authors. WebDAV is not widely used and has serious security concerns because it may allow clients to modify unauthorized files on the web server.

Description

Automation Controller NGINX web servers can be installed with functionality that, just by its nature, is not secure. Web Distributed Authoring (WebDAV) is an extension to the HTTP protocol that, when developed, was meant to allow users to create, change, and move documents on a server, typically a web server or web share. Allowing this functionality, development, and deployment is much easier for web authors. WebDAV is not widely used and has serious security concerns because it may allow clients to modify unauthorized files on the web server.

STIG	Date
Red Hat Ansible Automation Controller Web Server Security Technical Implementation Guide	2023-03-15

Details

Check Text ( C-60625r902362_chk )
As a system administrator, for each Automation Controller NGINX web server host, check the Automation Controller NGINX web server configuration for WebDAV modules: disallowed_modules=(nginx-dav-ext-module headers-more-nginx-module) ; echo "${disallowed_modules[]}" \| tr ' ' '\n' >tempfile ; nginx -V 2>&1 \| grep module \| tr ' ' '\n' \| grep module \| grep -v modules-path \| grep -Ff tempfile && echo "FAILED"; rm -f tempfile If "FAILED" is displayed, this is a finding. Check the Automation Controller NGINX web server configuration for WebDAV modules for disallowed WebDAV verbs, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK: NGINXCONF=`nginx -V 2>&1 \| tr ' ' '\n' \| sed -ne '/conf-path/{s/.conf-path=\(.\)/\1/;p}' ` ; grep dev_(.)methods $NGINXCONF \| grep 'COPY\|MOVE\|MKCO\|PROPFIND\|PROPPATCH\|LOCK\|UNLOCK' && echo 'FAILED' If "FAILED" is displayed, this is a finding.

Check Text ( C-60625r902362_chk )

As a system administrator, for each Automation Controller NGINX web server host, check the Automation Controller NGINX web server configuration for WebDAV modules:

disallowed_modules=(nginx-dav-ext-module headers-more-nginx-module) ; echo "${disallowed_modules[*]}" | tr ' ' '\n' >tempfile ; nginx -V 2>&1 | grep module | tr ' ' '\n' | grep module | grep -v modules-path | grep -Ff tempfile && echo "FAILED"; rm -f tempfile

If "FAILED" is displayed, this is a finding.

Check the Automation Controller NGINX web server configuration for WebDAV modules for disallowed WebDAV verbs, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK:

NGINXCONF=`nginx -V 2>&1 | tr ' ' '\n' | sed -ne '/conf-path/{s/.*conf-path=$.*$/\1/;p}' ` ;
grep dev_(.*)methods $NGINXCONF | grep 'COPY|MOVE|MKCO|PROPFIND|PROPPATCH|LOCK|UNLOCK' && echo 'FAILED'

If "FAILED" is displayed, this is a finding.

Fix Text (F-60567r902363_fix)
As a system administrator, for each Automation Controller nginx web server host, remove all WebDAV modules from the NGINX configuration file (nominally /etc/nginx/nginx.conf). Reload the NGINX server configurations for all NGINX processes: $ pkill -HUP nginx