The Palo Alto Networks security platform must inspect inbound and outbound SMTP and Extended SMTP communications traffic (if authorized) for protocol compliance and protocol anomalies.

From Palo Alto Networks ALG Security Technical Implementation Guide

Part of SRG-NET-000512-ALG-000064

Associated with: CCI-000366 CCI-001125

SV-77129r1_rule The Palo Alto Networks security platform must inspect inbound and outbound SMTP and Extended SMTP communications traffic (if authorized) for protocol compliance and protocol anomalies.

Vulnerability discussion

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 that exploit weaknesses of commonly used protocols. The device must 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.

Check content

If SMTP or ESMTP is authorized, ask the Administrator which Security Policy inspects authorized SMTP and ESMTP traffic. Go to Policies >> Security Select the identified Security Policy. If the "Profile" column does not display the "Antivirus Profile" symbol, this is a finding. If the "Profile" column does not display the "Vulnerability Protection Profile" symbol, this is a finding.

Fix text

If SMTP or ESMTP is authorized, configure a security policy to allow it and inspect it. Go to Policies >> Security Select "Add" to create a new security policy or select the name of the security policy to edit it. In the "Security Policy Rule" window, complete the required fields. In the "Name" tab, complete the "Name" and "Description" fields. In the "Source" tab, complete the "Source Zone" and "Source Address" fields. In the "User" tab, complete the "Source User" and "HIP Profile" fields. In the "Destination" tab, complete the "Destination Zone" and "Destination Address" fields. In the "Applications" tab, either select the "Any" check box or add SMTP. Configured filters and groups can be selected if the group includes SMTP. In the "Actions" tab, select "allow". In the "Actions" tab in the "Profile Setting" section; in the "Profile Type" field, select "Profiles". The window will change to display the different categories of Profiles. In the "Profile Setting" section; in each of the "Profile" fields, select the configured Profile. Note: An Antivirus Profile and an Antispyware Profile are required.

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