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Application Layer Gateway Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000319

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  • To protect against data mining, the ALG providing content filtering must detect code injection attacks from being launched against data storage objects, including, at a minimum, databases, database records, queries, and fields.

    &lt;VulnDiscussion&gt;Data mining is the analysis of large quantities of data to discover patterns and is used in intelligence gathering. Failure t...
    Rule Medium Severity
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  • SRG-NET-000319

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  • SRG-NET-000349

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  • To protect against data mining, the ALG providing content filtering must detect SQL injection attacks launched against data storage objects, including, at a minimum, databases, database records, and database fields.

    &lt;VulnDiscussion&gt;Data mining is the analysis of large quantities of data to discover patterns and is used in intelligence gathering. Failure t...
    Rule Medium Severity
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  • SRG-NET-000319

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  • To protect against data mining, the ALG providing content filtering as part of its intermediary services must detect code injection attacks launched against application objects including, at a minimum, application URLs and application code.

    &lt;VulnDiscussion&gt;Data mining is the analysis of large quantities of data to discover patterns and is used in intelligence gathering. Failure t...
    Rule Medium Severity
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  • SRG-NET-000323

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  • The ALG that is part of a CDS must use source and destination security attributes associated with organization-defined information, source, and/or destination objects to enforce organization-defined information flow control policies as a basis for flow control decisions.

    &lt;VulnDiscussion&gt;If information flow is not enforced based on approved authorizations, the system may become compromised. A mechanism to dete...
    Rule Medium Severity
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  • SRG-NET-000324

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  • The ALG that is part of a CDS, when transferring information between different security domains, must use organization-defined data type identifiers to validate data essential for information flow decisions.

    &lt;VulnDiscussion&gt;Information flow decisions based on invalid data may allow unintended and unauthorized data flows, and therefore risk the con...
    Rule Medium Severity
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  • SRG-NET-000325

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  • The ALG that is part of a CDS must uniquely identify and authenticate destination by organization, system, application, and/or individual for information transfer.

    &lt;VulnDiscussion&gt;Attribution is a critical component of a security concept of operations. The ability to identify source and destination point...
    Rule Medium Severity
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  • SRG-NET-000328

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  • The ALG that is part of a CDS, when transferring information between different security domains, must apply the same security policy filtering to metadata as it applies to data payloads.

    &lt;VulnDiscussion&gt;Subjecting metadata to the same filtering and inspection policies as payload data helps to mitigate the risk of data compromi...
    Rule Medium Severity
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  • SRG-NET-000329

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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-000331

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  • The ALG providing user access control intermediary services must provide the capability for authorized users to select a user session to capture or view.

    &lt;VulnDiscussion&gt;Without the capability to select a user session to capture or view, investigations into suspicious or harmful events would be...
    Rule Medium Severity
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  • SRG-NET-000334

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  • The ALG must off-load audit records onto a centralized log server.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common...
    Rule Medium Severity
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  • SRG-NET-000335

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  • The ALG must provide an immediate real-time alert to, at a minimum, the SCA and ISSO, of all audit failure events where the detection and/or prevention function is unable to write events to either local storage or the centralized server.

    &lt;VulnDiscussion&gt;Without a real-time alert, security personnel may be unaware of an impending failure of the audit capability and system opera...
    Rule Medium Severity
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  • SRG-NET-000339

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  • The ALG providing user authentication intermediary services must implement multifactor authentication for remote access to nonprivileged accounts such that one of the factors is provided by a device separate from the system gaining access.

    &lt;VulnDiscussion&gt;For remote access to nonprivileged accounts, the purpose of requiring a device that is separate from the information system g...
    Rule Medium Severity
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  • SRG-NET-000340

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  • The ALG providing user authentication intermediary services must implement multifactor authentication for remote access to privileged accounts such that one of the factors is provided by a device separate from the system gaining access.

    &lt;VulnDiscussion&gt;For remote access to privileged accounts, the purpose of requiring a device that is separate from the information system gain...
    Rule Medium Severity
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  • SRG-NET-000344

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  • The ALG must prohibit the use of cached authenticators after an organization-defined time period.

    &lt;VulnDiscussion&gt;If the cached authenticator information is out of date, the validity of the authentication information may be questionable. ...
    Rule Medium Severity
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  • SRG-NET-000345

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  • The ALG providing user authentication intermediary services using PKI-based user authentication must implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network.

    &lt;VulnDiscussion&gt;Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer autho...
    Rule Medium Severity
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  • The ALG providing user authentication intermediary services must conform to Federal Identity, Credential, and Access Management (FICAM)-issued profiles.

    &lt;VulnDiscussion&gt;Without conforming to FICAM-issued profiles, the information system may not be interoperable with FICAM-authentication protoc...
    Rule Medium Severity
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  • SRG-NET-000355

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  • The ALG providing user authentication intermediary services using PKI-based user authentication must only accept end entity certificates issued by DoD PKI or DoD-approved PKI Certification Authorities (CAs) for the establishment of protected sessions.

    &lt;VulnDiscussion&gt;Non-DoD approved PKIs have not been evaluated to ensure that they have security controls and identity vetting procedures in p...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The ALG providing content filtering must protect against known and unknown types of Denial of Service (DoS) attacks by employing rate-based attack prevention behavior analysis.

    &lt;VulnDiscussion&gt;If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installation...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The ALG must implement load balancing to limit the effects of known and unknown types of Denial of Service (DoS) attacks.

    &lt;VulnDiscussion&gt;If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Load balancin...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The ALG providing content filtering must protect against known types of Denial of Service (DoS) attacks by employing signatures.

    &lt;VulnDiscussion&gt;If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installatio...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The ALG providing content filtering must protect against or limit the effects of known and unknown types of Denial of Service (DoS) attacks by employing pattern recognition pre-processors.

    &lt;VulnDiscussion&gt;If the network does not provide safeguards against DoS attacks, network resources will be unavailable to users. Installation...
    Rule Medium Severity
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  • SRG-NET-000364

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  • The ALG must only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

    &lt;VulnDiscussion&gt;Unrestricted traffic may contain malicious traffic which poses a threat to an enclave or to other connected networks. Additio...
    Rule Medium Severity
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  • SRG-NET-000365

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  • The ALG must fail securely in the event of an operational failure.

    &lt;VulnDiscussion&gt;If a boundary protection device fails in an unsecure manner (open), information external to the boundary protection device ma...
    Rule Medium Severity
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  • SRG-NET-000370

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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-000380

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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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