The Juniper SRX Services Gateway Firewall must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

From Juniper SRX SG ALG Security Technical Implementation Guide

Associated with: CCI-001109

SV-80825r1_rule The Juniper SRX Services Gateway Firewall must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

Vulnerability discussion

A deny-all, permit-by-exception network communications traffic policy ensures that only those connections which are essential and approved are allowed.As a managed interface, the ALG must block all inbound and outbound network communications traffic to the application being managed and controlled unless a policy filter is installed to explicitly allow the traffic. The allow policy filters must comply with the site's security policy. A deny all, permit by exception network communications traffic policy ensures that only those connections which are essential and approved, are allowed.By default, Junos denies all traffic through an SRX Series device using an implicit default security policy exists that denies all packets. Organizations must configure security policies that permits or redirects traffic in compliance with DoD policies and best practices. Sites must not change the factory-default security policies.

Check content

Verify the default-policy has not been changed and is set to deny all traffic. [edit] show security policies default-policy If the default-policy is not set to deny-all, this is a finding.

Fix text

By default, the SRX device will not forward traffic unless it is explicitly permitted via security policy. If the default-policy has been changed, then this must be corrected using the set security policies default-policy command.

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