The ALG providing content filtering must protect against known and unknown types of Denial of Service (DoS) attacks by employing rate-based attack prevention behavior analysis.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-54629	SRG-NET-000362-ALG-000112	SV-68875r1_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. Detection components that use rate-based behavior analysis can detect attacks when signatures for the attack do not exist or are not installed. These attacks include zero-day attacks which are new attacks for which vendors have not yet developed signatures. Rate-based behavior analysis can detect sophisticated, Distributed DoS (DDoS) attacks by correlating traffic information from multiple network segments or components. 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. Detection components that use rate-based behavior analysis can detect attacks when signatures for the attack do not exist or are not installed. These attacks include zero-day attacks which are new attacks for which vendors have not yet developed signatures. Rate-based behavior analysis can detect sophisticated, Distributed DoS (DDoS) attacks by correlating traffic information from multiple network segments or components. 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-55249r1_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 and unknown types of DoS attacks by employing rate-based attack prevention behavior analysis. If the ALG does not protect against or limit the effects of known and unknown types of DoS attacks by employing rate-based attack prevention behavior analysis, this is a finding.

Check Text ( C-55249r1_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 and unknown types of DoS attacks by employing rate-based attack prevention behavior analysis.

If the ALG does not protect against or limit the effects of known and unknown types of DoS attacks by employing rate-based attack prevention behavior analysis, this is a finding.

Fix Text (F-59485r1_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 and unknown types of DoS attacks by employing rate-based attack prevention behavior analysis.