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

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000202-ALG-000124

    <GroupDescription></GroupDescription>
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  • The ALG must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

    &lt;VulnDiscussion&gt;A deny-all, permit-by-exception network communications traffic policy ensures that only those connections which are essential...
    Rule Medium Severity
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  • SRG-NET-000370-ALG-000125

    <GroupDescription></GroupDescription>
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  • The ALG must identify and log internal users associated with denied outgoing communications traffic posing a threat to external information systems.

    &lt;VulnDiscussion&gt;Without identifying the users who initiated the traffic, it would be difficult to identify those responsible for the denied c...
    Rule Medium Severity
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  • SRG-NET-000401-ALG-000127

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  • The ALG must check the validity of all data inputs except those specifically identified by the organization.

    &lt;VulnDiscussion&gt;Invalid user input occurs when a user inserts data or characters into an application's data entry fields and the application ...
    Rule Medium Severity
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  • SRG-NET-000380-ALG-000128

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  • The ALG must behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received.

    &lt;VulnDiscussion&gt;A common vulnerability of network elements is unpredictable behavior when invalid inputs are received. This requirement guard...
    Rule Medium Severity
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  • SRG-NET-000273-ALG-000129

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  • The ALG must generate error messages that provide the information necessary for corrective actions without revealing information that could be exploited by adversaries.

    &lt;VulnDiscussion&gt;Providing too much information in error messages risks compromising the data and security of the application and system. Org...
    Rule Medium Severity
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  • SRG-NET-000402-ALG-000130

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  • The ALG must reveal error messages only to the ISSO, ISSM, and SCA.

    &lt;VulnDiscussion&gt;Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an orga...
    Rule Medium Severity
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  • SRG-NET-000251-ALG-000131

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  • The ALG providing content filtering must automatically update malicious code protection mechanisms.

    &lt;VulnDiscussion&gt;The malicious software detection functionality on network elements needs to be constantly updated in order to identify new th...
    Rule Medium Severity
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  • SRG-NET-000246-ALG-000132

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  • The ALG providing content filtering must update malicious code protection mechanisms and signature definitions whenever new releases are available in accordance with organizational configuration management policy and procedures.

    &lt;VulnDiscussion&gt;Malicious code protection mechanisms include, but are not limited to, anti-virus and malware detection software. In order to ...
    Rule Medium Severity
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  • SRG-NET-000248-ALG-000133

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  • The ALG providing content filtering must be configured to perform real-time scans of files from external sources at network entry/exit points as they are downloaded and prior to being opened or executed.

    &lt;VulnDiscussion&gt;Malicious code includes viruses, worms, Trojan horses, and Spyware. The code provides the ability for a malicious user to rea...
    Rule Medium Severity
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  • SRG-NET-000249-ALG-000134

    <GroupDescription></GroupDescription>
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  • The ALG providing content filtering must block malicious code upon detection.

    &lt;VulnDiscussion&gt;Taking an appropriate action based on local organizational incident handling procedures minimizes the impact of this code on ...
    Rule Medium Severity
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