The Apache web server must maintain the confidentiality and integrity of information during preparation for transmission.

From Apache Server 2.4 UNIX Site Security Technical Implementation Guide

Part of SRG-APP-000441-WSR-000181

Associated with: CCI-002420

AS24-U2-000920_rule The Apache web server must maintain the confidentiality and integrity of information during preparation for transmission.

Vulnerability discussion

Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, including, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information. An example of this would be an SMTP queue. This queue may be added to an Apache web server through an SMTP module to enhance error reporting or to allow developers to add SMTP functionality to their applications. Any modules used by the Apache web server that queue data before transmission must maintain the confidentiality and integrity of the information before the data is transmitted.

Check content

In a command line, run "httpd -M | grep -i ssl_module". If the "ssl_module" is not enabled, this is a finding. Determine the location of the "HTTPD_ROOT" directory and the "httpd.conf" file: # httpd -V | egrep -i 'httpd_root|server_config_file' -D HTTPD_ROOT="/etc/httpd" -D SERVER_CONFIG_FILE="conf/httpd.conf" Search for the directive "SSLProtocol" in the "httpd.conf" file: # cat //httpd.conf | grep -i "SSLProtocol" If the "SSLProtocol" directive is missing or does not look like the following, this is a finding: SSLProtocol -ALL +TLSv1.2 If the TLS version is not TLS 1.2 or higher, according to NIST SP 800-52 Rev 2, or if non-FIPS-approved algorithms are enabled, this is a finding. NOTE: In some cases, web servers are configured in an environment to support load balancing. This configuration most likely uses a content switch to control traffic to the various web servers. In this situation, the TLS certificate for the websites may be installed on the content switch versus the individual websites. This solution is acceptable as long as the web servers are isolated from the general population LAN. Users should not have the ability to bypass the content switch to access the websites.

Fix text

Determine the location of the "HTTPD_ROOT" directory and the "httpd.conf" file: # httpd -V | egrep -i 'httpd_root|server_config_file' -D HTTPD_ROOT="/etc/httpd" -D SERVER_CONFIG_FILE="conf/httpd.conf" Ensure the "SSLProtocol" is added and looks like the following: SSLProtocol -ALL +TLSv1.2 Restart Apache: apachectl restart

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.

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