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    4. Customize the Action and Trigger Conditions for a Brute Force Signature

    Customize the Action and Trigger Conditions for a Brute Force Signature

    Where Can I Use This?
    What Do I Need?
    • NGFW
    • Advanced Threat Prevention or Threat Prevention License
    The firewall includes two types of predefined brute force signatures—parent signatures and child signatures. A child signature is a single occurrence of a traffic pattern that matches the signature. A parent signature is associated with a child signature and is triggered when multiple events occur within a specified time interval and that matches the traffic pattern defined in the child signature.
    Typically, the default action for a child signature is allow because a single event is not indicative of an attack. This ensures that legitimate traffic is not blocked and avoids generating threat logs for non-noteworthy events. Palo Alto Networks recommends that you do not change the default action without careful consideration.
    In most cases, the brute force signature is a noteworthy event due to its recurrent pattern. If needed, you can do one of the following to customize the action for a brute-force signature:
    • Create a rule to modify the default action for all signatures in the brute force category. You can choose to allow, alert, block, reset, or drop the traffic.
    • Define an exception for a specific signature. For example, you can search for and define an exception for a CVE.
    For a parent signature, you can modify both the trigger conditions and the action; for a child signature, you can modify only the action.
    To effectively mitigate an attack, specify the block-ip address action instead of the drop or reset action for most brute force signatures.
    1. Create a new Vulnerability Protection profile.
      1. Select
        Objects
        Security Profiles
        Vulnerability Protection
         and
        Add
         a profile.
      2. Enter a
        Name
         for the Vulnerability Protection profile.
      3. (
        Optional
        ) Enter a
        Description
        .
      4. (
        Optional
        ) Specify that the profile is
        Shared
         with:
        • Every virtual system (vsys) on a multi-vsys firewall
          —If cleared (disabled), the profile is available only to the Virtual System selected in the
          Objects
           tab.
        • Every device group on Panorama
          —If cleared (disabled), the profile is available only to the Device Group selected in the
          Objects
           tab.
      5. (
        Optional—Panorama only
        ) Select
        Disable override
         to prevent administrators from overriding the settings of this Vulnerability Protection profile in device groups that inherit the profile. This selection is cleared by default, which means administrators can override the settings for any device group that inherits the profile.
    2. Create a rule that defines the action for all signatures in a category.
      1. On the
        Rules
         tab,
        Add
         and enter a
        Rule Name
         for a new rule.
      2. (
        Optional
        ) Specify a specific threat name (default is
        any
        ).
      3. Set the
        Action
        . In this example, it is set to
        Block IP
        .
        If you set a Vulnerability Protection profile to Block IP, the firewall first uses hardware to block IP addresses. If attack traffic exceeds the blocking capacity of the hardware, the firewall then uses software blocking mechanisms to block the remaining IP addresses.
      4. Set
        Category
         to
        brute-force
        .
      5. (
        Optional
        ) If blocking, specify the
        Host Type
         on which to block:
        server
         or
        client
         (default is
        any
        ).
      6. See Step 3 to customize the action for a specific signature.
      7. See Step 4 to customize the trigger threshold for a parent signature.
      8. Click
        OK
         to save the rule and the profile.
    3. (
      Optional
      ) Customize the action for a specific signature.
      1. On the
        Exceptions
         tab,
        Show all signatures
         to find the signature you want to modify.
        To view all the signatures in the brute-force category, search for
        category contains 'brute-force'
        .
      2. To edit a specific signature, click the predefined default action in the Action column.
      3. Set the action:
        Allow
        ,
        Alert
        ,
        Block Ip
        , or
        Drop
        . If you select
        Block Ip
        , complete these additional tasks:
        1. Specify the
          Time
           period (in seconds) after which to trigger the action.
        2. Specify whether to
          Track By
           and block the IP address using the
          IP source
           or the
          IP source and destination
          .
      4. Click
        OK
        .
      5. For each modified signature, select the check box in the
        Enable
         column.
      6. Click
        OK
        .
    4. Customize the trigger conditions for a parent signature.
      A parent signature that can be edited is marked with this icon: .
      In this example, the search criteria was brute force category and CVE-2008-1447.
      1. Edit ( ) the time attribute and the aggregation criteria for the signature.
      2. To modify the trigger threshold, specify the
        Number of Hits
         per number of
        seconds
        .
      3. Specify whether to aggregate the number of hits (
        Aggregation Criteria
        ) by
        source
        ,
        destination
        , or
        source-and-destination
        .
      4. Click
        OK
        .
    5. Attach this new profile to a Security policy rule.
      1. Select
        Policies
        Security
         and
        Add
         or modify a Security policy rule.
      2. On the
        Actions
         tab, select
        Profiles
         as the
        Profile Type
         for the Profile Setting.
      3. Select your
        Vulnerability Protection
         profile.
      4. Click
        OK
        .
    6. Commit your changes.
      1. Click
        Commit
        .

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