The ALG that provides intermediary services for SMTP must inspect inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-54457	SRG-NET-000512-ALG-000064	SV-68703r1_rule		Medium

Description
Application protocol anomaly detection examines application layer protocols such as SMTP to identify attacks based on observed deviations in the normal RFC behavior of a protocol or service. This type of monitoring allows for the detection of known and unknown exploits which exploit weaknesses of commonly used protocols. Since protocol anomaly analysis examines the application payload for patterns or anomalies, an SMTP proxy must be included in the ALG. This ALG will be configured to inspect inbound and outbound SMTP and Extended SMTP communications traffic to detect protocol anomalies such as malformed message and command insertion attacks.

Description

Application protocol anomaly detection examines application layer protocols such as SMTP to identify attacks based on observed deviations in the normal RFC behavior of a protocol or service. This type of monitoring allows for the detection of known and unknown exploits which exploit weaknesses of commonly used protocols. Since protocol anomaly analysis examines the application payload for patterns or anomalies, an SMTP proxy must be included in the ALG. This ALG will be configured to inspect inbound and outbound SMTP and Extended SMTP communications traffic to detect protocol anomalies such as malformed message and command insertion attacks.

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

Details

Check Text ( C-55073r1_chk )
If the ALG does not provide intermediary/proxy services for SMTP communications traffic, this is not applicable. Verify the ALG inspects inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies. If the ALG does not inspect inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies, this is a finding.

Check Text ( C-55073r1_chk )

If the ALG does not provide intermediary/proxy services for SMTP communications traffic, this is not applicable.

Verify the ALG inspects inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies.

If the ALG does not inspect inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies, this is a finding.

Fix Text (F-59311r1_fix)
If the ALG provides intermediary/proxy services SMTP communications traffic, configure the ALG to inspect inbound and outbound SMTP and Extended SMTP communications traffic for protocol compliance and protocol anomalies.