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Application Layer Gateway (ALG) Security Requirements Guide (SRG)

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The ALG that is part of a CDS must enforce organization-defined one-way information flows using hardware mechanisms.

    <VulnDiscussion>Information flow control regulates where information is allowed to travel within a network and between interconnected network...
    Rule Medium Severity
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  • SRG-NET-000033-ALG-000083

    <GroupDescription></GroupDescription>
    Group
    Show

  • The ALG that is part of a CDS must enforce information flow control using organization-defined security policy filters as a basis for flow control decisions for organization-defined information flows.

    &lt;VulnDiscussion&gt;The use of security policy filters provides protection for the confidentiality of data by restricting the flow of data. Conf...
    Rule Medium Severity
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  • SRG-NET-000329-ALG-000084

    <GroupDescription></GroupDescription>
    Group
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  • SRG-NET-000345-ALG-000099

    <GroupDescription></GroupDescription>
    Group
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  • The ALG that is part of a CDS must enforce the use of human reviews for organization-defined information flows under organization-defined conditions.

    &lt;VulnDiscussion&gt;Without network element enforcement of human reviews, security policy filters may have false positives and false negatives in...
    Rule Medium Severity
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  • SRG-NET-000131-ALG-000085

    <GroupDescription></GroupDescription>
    Group
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  • The ALG must not have unnecessary services and functions enabled.

    &lt;VulnDiscussion&gt;Information systems are capable of providing a wide variety of functions (capabilities or processes) and services. Some of th...
    Rule Medium Severity
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  • SRG-NET-000131-ALG-000086

    <GroupDescription></GroupDescription>
    Group
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  • The ALG must be configured to remove or disable unrelated or unneeded application proxy services.

    &lt;VulnDiscussion&gt;Unrelated or unneeded proxy services increase the attack vector and add excessive complexity to the securing of the ALG. Mult...
    Rule Medium Severity
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  • SRG-NET-000132-ALG-000087

    <GroupDescription></GroupDescription>
    Group
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  • The ALG must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.

    &lt;VulnDiscussion&gt;In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....
    Rule Medium Severity
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  • SRG-NET-000337-ALG-000096

    <GroupDescription></GroupDescription>
    Group
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  • The ALG providing user authentication intermediary services must require users to re-authenticate when organization-defined circumstances or situations require re-authentication.

    &lt;VulnDiscussion&gt;Without re-authentication, users may access resources or perform tasks for which they do not have authorization. In addition...
    Rule Medium Severity
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  • SRG-NET-000138-ALG-000088

    <GroupDescription></GroupDescription>
    Group
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  • The ALG providing user access control intermediary services must be configured with a pre-established trust relationship and mechanisms with appropriate authorities (e.g., Active Directory or AAA server) which validate user account access authorizations and privileges.

    &lt;VulnDiscussion&gt;User account and privilege validation must be centralized in order to prevent unauthorized access using changed or revoked pr...
    Rule Medium Severity
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  • SRG-NET-000138-ALG-000063

    <GroupDescription></GroupDescription>
    Group
    Show

  • The ALG providing user authentication intermediary services must uniquely identify and authenticate organizational users (or processes acting on behalf of organizational users).

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule Medium Severity
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  • SRG-NET-000138-ALG-000089

    <GroupDescription></GroupDescription>
    Group
    Show

  • The ALG providing user authentication intermediary services must restrict user authentication traffic to specific authentication server(s).

    &lt;VulnDiscussion&gt;User authentication can be used as part of the policy filtering rule sets. Some URLs or network resources can be restricted t...
    Rule Medium Severity
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