An Apache web server, behind a load balancer or proxy server, must produce log records containing the client IP information as the source and destination and not the load balancer or proxy IP information with each event.

From Apache Server 2.4 Windows Site Security Technical Implementation Guide

Associated with: CCI-000133

AS24-W2-000130_rule An Apache web server, behind a load balancer or proxy server, must produce log records containing the client IP information as the source and destination and not the load balancer or proxy IP information with each event.

Vulnerability discussion

Web server logging capability is critical for accurate forensic analysis. Without sufficient and accurate information, a correct replay of the events cannot be determined.Ascertaining the correct source, e.g., source IP, of the events is important during forensic analysis. Correctly determining the source of events will add information to the overall reconstruction of the logable event. By determining the source of the event correctly, analysis of the enterprise can be undertaken to determine if events tied to the source occurred in other areas within the enterprise.A web server behind a load balancer or proxy server, when not configured correctly, will record the load balancer or proxy server as the source of every logable event. When looking at the information forensically, this information is not helpful in the investigation of events. The web server must record with each event the client source of the event.

Check content

Review the access log file. If necessary, review the <'INSTALLED PATH'>\conf\httpd.conf file to determine the location of the logs. Items to be logged are as shown in this sample line in the <'INSTALLED PATH'>\conf\httpd.conf file: LogFormat "%a %A %h %H %l %m %s %t %u %U \"%{Referer}i\" " combined If the web server is not configured to capture the required audit events for all sites and virtual directories, this is a finding.

Fix text

Open the <'INSTALLED PATH'>\conf\httpd.conf file. Configure the "LogFormat" to look like the following within the block: LogFormat "%a %A %h %H %l %m %s %t %u %U \"%{Referer}i\" " combined

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