V-214257

Discussion

Information needed by an attacker to begin looking for possible vulnerabilities in a web server includes any information about the web server and plug-ins or modules being used. When debugging or trace information is enabled in a production web server, information about the web server, such as web server type, version, patches installed, plug-ins and modules installed, type of code being used by the hosted application, and any backends being used for data storage may be displayed. Since this information may be placed in logs and general messages during normal operation of the web server, an attacker does not need to cause an error condition to gain this information.

Check Content

Determine the location of the "HTTPD_ROOT" directory and the "httpd.conf" file:

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

Note: The apachectl front end is the preferred method for locating the Apache httpd file. For some Linux distributions, "apache2ctl -V" or  "httpd -V" can also be used. 

For any enabled "TraceEnable" directives, verify they are part of the server-level configuration (i.e., not nested in a "Directory" or "Location" directive). 

Verify that the "TraceEnable" directive is set to "Off":

# cat /<path_to_file>/httpd.conf | grep -i "TraceEnable"

If the "TraceEnable" directive is not part of the server-level configuration and/or is not set to "Off", this is a finding.

If the directive does not exist in the "conf" file, this is a finding because the default value is "On".

If the "LogLevel" directive is not being used, this is a finding: 

# cat /<path_to_file>/httpd.conf | grep -i "LogLevel"