The Apache web server must remove all export ciphers to protect the confidentiality and integrity of transmitted information.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-92745	AS24-U1-000900	SV-102833r1_rule		Medium

Description
During the initial setup of a Transport Layer Security (TLS) connection to the Apache web server, the client sends a list of supported cipher suites in order of preference. The Apache web server will reply with the cipher suite it will use for communication from the client list. If an attacker can intercept the submission of cipher suites to the Apache web server and place, as the preferred cipher suite, a weak export suite, the encryption used for the session becomes easy for the attacker to break, often within minutes to hours.

Description

During the initial setup of a Transport Layer Security (TLS) connection to the Apache web server, the client sends a list of supported cipher suites in order of preference. The Apache web server will reply with the cipher suite it will use for communication from the client list. If an attacker can intercept the submission of cipher suites to the Apache web server and place, as the preferred cipher suite, a weak export suite, the encryption used for the session becomes easy for the attacker to break, often within minutes to hours.

STIG	Date
Apache Server 2.4 UNIX Server Security Technical Implementation Guide	2019-05-23

Details

Check Text ( C-92051r2_chk )
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 "SSLCACertificateFile" directive: # cat //httpd.conf \| grep -i "SSLCACertificateFile" Review the path of the "SSLCACertificateFile" directive. Review the contents of <'path of cert'>\ca-bundle.crt. Examine the contents of this file to determine if the trusted CAs are DoD approved. If the trusted CA that is used to authenticate users to the website does not lead to an approved DoD CA, this is a finding. NOTE: There are non-DoD roots that must be on the server for it to function. Some applications, such as antivirus programs, require root CAs to function. DoD-approved certificate can include the External Certificate Authorities (ECA) if approved by the AO. The PKE InstallRoot 3.06 System Administrator Guide (SAG), dated 08 Jul 2008, contains a complete list of DoD, ECA, and IECA CAs.

Check Text ( C-92051r2_chk )

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 "SSLCACertificateFile" directive:

# cat //httpd.conf | grep -i "SSLCACertificateFile"

Review the path of the "SSLCACertificateFile" directive.

Review the contents of <'path of cert'>\ca-bundle.crt.

Examine the contents of this file to determine if the trusted CAs are DoD approved.

If the trusted CA that is used to authenticate users to the website does not lead to an approved DoD CA, this is a finding.

NOTE: There are non-DoD roots that must be on the server for it to function. Some applications, such as antivirus programs, require root CAs to function. DoD-approved certificate can include the External Certificate Authorities (ECA) if approved by the AO. The PKE InstallRoot 3.06 System Administrator Guide (SAG), dated 08 Jul 2008, contains a complete list of DoD, ECA, and IECA CAs.

Fix Text (F-98989r1_fix)
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