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

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000213-ALG-000107

    <GroupDescription></GroupDescription>
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  • The ALG must terminate all network connections associated with a communications session at the end of the session, or as follows: for in-band management sessions (privileged sessions), the session must be terminated after 10 minutes of inactivity; and for user sessions (non-privileged session), the session must be terminated after 15 minutes of inactivity.

    &lt;VulnDiscussion&gt;Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take c...
    Rule Medium Severity
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  • SRG-NET-000510-ALG-000025

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  • The ALG providing encryption intermediary services must implement NIST FIPS-validated cryptography to generate cryptographic hashes.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The network el...
    Rule Medium Severity
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  • SRG-NET-000510-ALG-000040

    <GroupDescription></GroupDescription>
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  • The ALG providing encryption intermediary services must implement NIST FIPS-validated cryptography for digital signatures.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The network el...
    Rule Medium Severity
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  • SRG-NET-000510-ALG-000111

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  • The ALG providing encryption intermediary services must use NIST FIPS-validated cryptography to implement encryption services.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The network el...
    Rule Medium Severity
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  • SRG-NET-000228-ALG-000108

    <GroupDescription></GroupDescription>
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  • The ALG must detect, at a minimum, mobile code that is unsigned or exhibiting unusual behavior, has not undergone a risk assessment, or is prohibited for use based on a risk assessment.

    &lt;VulnDiscussion&gt;Mobile code is defined as software modules obtained from remote systems, transferred across a network, and then downloaded an...
    Rule Medium Severity
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  • SRG-NET-000288-ALG-000109

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  • The ALG providing content filtering must block or restrict detected prohibited mobile code.

    &lt;VulnDiscussion&gt;Mobile code is defined as software modules obtained from remote systems, transferred across a network, and then downloaded an...
    Rule Medium Severity
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  • SRG-NET-000289-ALG-000110

    <GroupDescription></GroupDescription>
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  • The ALG providing content filtering must prevent the download of prohibited mobile code.

    &lt;VulnDiscussion&gt;Mobile code is defined as software modules obtained from remote systems, transferred across a network, and then downloaded an...
    Rule Medium Severity
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  • SRG-NET-000230-ALG-000113

    <GroupDescription></GroupDescription>
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  • The ALG must protect the authenticity of communications sessions.

    &lt;VulnDiscussion&gt;Authenticity protection provides protection against man-in-the-middle attacks/session hijacking and the insertion of false in...
    Rule Medium Severity
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  • SRG-NET-000231-ALG-000114

    <GroupDescription></GroupDescription>
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  • The ALG must invalidate session identifiers upon user logout or other session termination.

    &lt;VulnDiscussion&gt;Captured sessions can be reused in "replay" attacks. This requirement limits the ability of adversaries from capturing and co...
    Rule Medium Severity
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  • SRG-NET-000233-ALG-000115

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  • The ALG must recognize only system-generated session identifiers.

    &lt;VulnDiscussion&gt;Network elements (depending on function) utilize sessions and session identifiers to control application behavior and user ac...
    Rule Medium Severity
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