The web server must not be configured as a proxy server.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26299	WA00520 A22	SV-33220r3_rule		Medium

Description
The Apache proxy modules allow the server to act as a proxy (either forward or reverse proxy) of http and other protocols with additional proxy modules loaded. If the Apache installation is not intended to proxy requests to or from another network then the proxy module should not be loaded. Proxy servers can act as an important security control when properly configured, however a secure proxy server is not within the scope of this STIG. A web server should be primarily a web server or a proxy server but not both, for the same reasons that other multi-use servers are not recommended. Scanning for web servers that will also proxy requests is a very common attack, as proxy servers are useful for anonymizing attacks on other servers, or possibly proxying requests into an otherwise protected network.

Description

The Apache proxy modules allow the server to act as a proxy (either forward or reverse proxy) of http and other protocols with additional proxy modules loaded. If the Apache installation is not intended to proxy requests to or from another network then the proxy module should not be loaded. Proxy servers can act as an important security control when properly configured, however a secure proxy server is not within the scope of this STIG. A web server should be primarily a web server or a proxy server but not both, for the same reasons that other multi-use servers are not recommended. Scanning for web servers that will also proxy requests is a very common attack, as proxy servers are useful for anonymizing attacks on other servers, or possibly proxying requests into an otherwise protected network.

STIG	Date
APACHE 2.2 Server for UNIX Security Technical Implementation Guide	2019-01-07

Details

Check Text ( C-33762r3_chk )
Note: If the Apache web server is only performing in a proxy server role and does not host any websites nor support any applications, this check is Not Applicable. Enter the following command: /usr/local/Apache2.2/bin/httpd –M. This will provide a list of all loaded modules. If any of the following modules are found, this is a finding: proxy_module proxy_ajp_module proxy_balancer_module proxy_ftp_module proxy_http_module proxy_connect_module

Check Text ( C-33762r3_chk )

Note: If the Apache web server is only performing in a proxy server role and does not host any websites nor support any applications, this check is Not Applicable.

Enter the following command:
/usr/local/Apache2.2/bin/httpd –M.
This will provide a list of all loaded modules. If any of the following modules are found, this is a finding:
proxy_module
proxy_ajp_module
proxy_balancer_module
proxy_ftp_module
proxy_http_module
proxy_connect_module

Fix Text (F-29398r1_fix)
Edit the httpd.conf file and remove the following modules: proxy_module proxy_ajp_module proxy_balancer_module proxy_ftp_module proxy_http_module proxy_connect_module