From F5 BIG-IP Local Traffic Manager 11.x Security Technical Implementation Guide
Part of SRG-NET-000401-ALG-000127
Associated with: CCI-001310
Invalid user input occurs when a user inserts data or characters into an application's data entry fields and the application is unprepared to process that data. This results in unanticipated application behavior potentially leading to an application or information system compromise. Invalid input is one of the primary methods employed when attempting to compromise an application.
If the BIG-IP Core does not perform content inspection as part of the traffic management functionality for virtual servers, this is not applicable. When content inspection is performed as part of the traffic management functionality, verify the BIG-IP Core is configured to check the validity of all data inputs except those specifically identified by the organization. Verify Virtual Server(s) in the BIG-IP LTM module are configured with an ASM policy to check the validity of all data inputs except those specifically identified by the organization. Navigate to the BIG-IP System manager >> Local Traffic >> Virtual Servers >> Virtual Servers List tab. Select Virtual Servers(s) from the list to verify. Navigate to the Security >> Policies tab. Verify that "Application Security Policy" is Enabled and "Policy" is set to use an ASM policy to check the validity of all data inputs except those specifically identified by the organization. If the BIG-IP Core is not configured to check the validity of all data inputs except those specifically identified by the organization, this is a finding.
If the BIG-IP Core performs content inspection as part of the traffic management functionality, configure the BIG-IP Core as follows: Configure a policy in the BIG-IP ASM module to check the validity of all data inputs except those specifically identified by the organization. Apply ASM policy to the applicable Virtual Server(s) in BIG-IP LTM module to check the validity of all data inputs except those specifically identified by the organization.
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