The firewall implementation must allow only system generated session identifiers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-NET-000233-FW-000146	SRG-NET-000233-FW-000146	SRG-NET-000233-FW-000146_rule		Medium

Description
Unique session IDs are the opposite of sequentially generated session IDs which can be easily guessed by an attacker. Unique session identifiers help to reduce predictability of said identifiers, especially when generated by the firewall itself. Unique session IDs address man-in-the-middle attacks including session hijacking or insertion of false information into a session. If the attacker is unable to identify or guess the session information related to firewall application traffic, they will have more difficulty in hijacking the session or otherwise manipulating valid sessions.

Description

Unique session IDs are the opposite of sequentially generated session IDs which can be easily guessed by an attacker. Unique session identifiers help to reduce predictability of said identifiers, especially when generated by the firewall itself. Unique session IDs address man-in-the-middle attacks including session hijacking or insertion of false information into a session. If the attacker is unable to identify or guess the session information related to firewall application traffic, they will have more difficulty in hijacking the session or otherwise manipulating valid sessions.

STIG	Date
Firewall Security Requirements Guide	2012-12-10

Details

Check Text ( C-SRG-NET-000233-FW-000146_chk )
Verify the system is configured to allow only system generated session identifiers for communications. If the firewall is not configured to allow only system generated session identifiers for communications, this is a finding.

Fix Text (F-SRG-NET-000233-FW-000146_fix)
Configure the system to allow only system generated session identifiers for communications.