The ALG providing content filtering must protect against known types of Denial of Service (DoS) attacks by employing signatures.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-54633	SRG-NET-000362-ALG-000126	SV-68879r1_rule		Medium

Description
If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installation of content filtering gateways and application layer firewalls at key boundaries in the architecture mitigates the risk of DoS attacks. These attacks can be detected by matching observed communications traffic with patterns of known attacks and monitoring for anomalies in traffic volume, type, or protocol usage. Detection components that use signatures can detect known attacks by using known attack signatures. Signatures are usually obtained from and updated by the ALG component vendor. This requirement applies to the communications traffic functionality of the ALG as it pertains to handling communications traffic, rather than to the ALG device itself.

Description

If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installation of content filtering gateways and application layer firewalls at key boundaries in the architecture mitigates the risk of DoS attacks. These attacks can be detected by matching observed communications traffic with patterns of known attacks and monitoring for anomalies in traffic volume, type, or protocol usage. Detection components that use signatures can detect known attacks by using known attack signatures. Signatures are usually obtained from and updated by the ALG component vendor. This requirement applies to the communications traffic functionality of the ALG as it pertains to handling communications traffic, rather than to the ALG device itself.

STIG	Date
Application Layer Gateway (ALG) Security Requirements Guide (SRG)	2015-06-30

Details

Check Text ( C-55253r1_chk )
If the ALG does not perform content filtering as part of the traffic management functions, this is not applicable. Verify the ALG protects against or limits the effects of known types of DoS attacks by employing signatures. If the ALG does not protect against or limit the effects of known types of DoS attacks by employing signatures, this is a finding.

Fix Text (F-59489r1_fix)
If the ALG performs content filtering as part of the traffic management functionality, configure the ALG to protect against or limit the effects of known types of DoS attacks by employing signatures.