If a Secure File Transfer Protocol (SFTP) server is used to provide updates to the sensors, the server must be configured to allow read-only access to the files within the directory on which the signature packs are placed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-18506	NET-IDPS-029	SV-20041r2_rule		Medium

Description
In a large scale IDPS deployment, it is common to have an automated update process implemented. This is accomplished by having the updates downloaded on a dedicated SFTP server within the management network. The SFTP server should be configured to allow read-only access to the files within the directory on which the signature packs are placed, and then only from the account that the sensors will use. The sensors can then be configured to automatically check the SFTP server periodically to look for the new signature packs and to update themselves once they have been tested.

Description

In a large scale IDPS deployment, it is common to have an automated update process implemented. This is accomplished by having the updates downloaded on a dedicated SFTP server within the management network. The SFTP server should be configured to allow read-only access to the files within the directory on which the signature packs are placed, and then only from the account that the sensors will use. The sensors can then be configured to automatically check the SFTP server periodically to look for the new signature packs and to update themselves once they have been tested.

STIG	Date
Network Infrastructure Policy Security Technical Implementation Guide	2017-12-07

Details

Check Text ( C-21207r2_chk )
If the signatures are located on a server, verify that the directories on which the signature packs are placed are protected by read-only access. If the directories are not set for read-only access, this is a finding.

Fix Text (F-19097r1_fix)
Modify the access restrictions to prevent the signatures from being updated.