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The Apache web server must perform RFC 5280-compliant certification path validation.


Overview

Finding ID Version Rule ID IA Controls Severity
V-214286 AS24-U2-000380 SV-214286r881487_rule Medium
Description
A certificate's certification path is the path from the end entity certificate to a trusted root certification authority (CA). Certification path validation is necessary for a relying party to make an informed decision regarding acceptance of an end entity certificate. Certification path validation includes checks such as certificate issuer trust, time validity, and revocation status for each certificate in the certification path. Revocation status information for CA and subject certificates in a certification path is commonly provided via certificate revocation lists (CRLs) or online certificate status protocol (OCSP) responses.
STIG Date
Apache Server 2.4 UNIX Site Security Technical Implementation Guide 2023-06-06

Details

Check Text ( C-15499r881485_chk )
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 "ssl.conf" file:

# apachectl -V | egrep -i 'httpd_root|server_config_file'
-D HTTPD_ROOT="/etc/httpd"

Review <'HTTPD_ROOT'>/conf.d/ssl.conf

Verify "SSLVerifyClient" is set to "require":

SSLVerifyClient require

Verify "SSLVerifyDepth" is set to a number greater than "0":

SSLVerifyDepth 1

If "SSLVerifyClient" is not set to "require" or "SSLVerifyDepth" is not set to a number greater than "0", this is a finding.
Fix Text (F-15497r881486_fix)
Determine the location of the "HTTPD_ROOT" directory and the "ssl.conf" file:

# apachectl -V | egrep -i 'httpd_root|server_config_file'
-D HTTPD_ROOT="/etc/httpd"

Edit <'HTTPD_ROOT'>/conf.d/ssl.conf

Set "SSLVerifyClient" to "require".

Set "SSLVerifyDepth" to "1".

SSLVerifyDepth 1

For more information: https://httpd.apache.org/docs/current/mod/ssl_module.html