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Manual Chapter: Securing FTP Traffic Using the Default Configuration
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Securing FTP Traffic Using the Default Configuration

Overview: Securing FTP traffic using default values

This implementation describes how to secure FTP traffic the easy way--by using default values. When you use an FTP security profile, the BIG-IP® system inspects FTP traffic for network vulnerabilities. A default FTP security profile is included in the system that you can use. To activate security checks for FTP traffic, you enable protocol security in an FTP service profile, and associate the service profile with a virtual server.

You can use the default configuration to protect against the following FTP security risks:

  • Port scanning exploits
  • Anonymous FTP requests
  • Command line length exceeds the defined length
  • Potentially dangerous FTP commands
  • Traffic that fails FTP protocol compliance checks
  • Brute force attacks (due to excessive FTP login attempts)
  • File stealing exploits

Task summary

Creating an FTP service profile with security enabled

The easiest method for initiating FTP protocol security for your FTP virtual server traffic is to use the system default settings. You do this by enabling protocol security for the system-supplied FTP service profile, and then associating that service profile with a virtual server.
  1. On the Main tab, click Local Traffic > Profiles > Services > FTP .
    The FTP profile list screen opens.
  2. In the Name column, click ftp.
    The Properties screen for the system-supplied FTP profile opens.
  3. In the Settings area, clear the Translate Extended check box if you want to disable IPv6 translation.
  4. Retain the Data Port setting default value of 20.
  5. Select the Protocol Security check box to enable FTP security checks.
  6. Click Update.
You now have a security-enabled service profile that you can associate with a virtual server so that FTP protocol checks are performed on the traffic that the FTP virtual server receives.

Enabling protocol security for an FTP virtual server

When you enable protocol security for an FTP virtual server, the system scans any incoming FTP traffic for vulnerabilities before the traffic reaches the FTP servers.
  1. On the Main tab, click Local Traffic > Virtual Servers .
    The Virtual Server List screen opens.
  2. Click the Create button.
    The New Virtual Server screen opens.
  3. In the Name field, type a unique name for the virtual server.
  4. In the Destination Address field, type the IP address in CIDR format.
    The supported format is address/prefix, where the prefix length is in bits. For example, an IPv4 address/prefix is 10.0.0.1 or 10.0.0.0/24, and an IPv6 address/prefix is ffe1::0020/64 or 2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4 address without specifying a prefix, the BIG-IP system automatically uses a /32 prefix.
    Note: The IP address you type must be available and not in the loopback network.
  5. In the Service Port field, type 21 or select FTP from the list.
  6. In the Configuration area, for the FTP Profile setting, select the default profile, ftp.
  7. From the Source Address Translation list, select Auto Map.
  8. For the Default Pool setting, either select an existing pool from the list, or click the Create (+) button and create a new pool.
  9. Click Finished.
The custom FTP virtual server appears in the Virtual Servers list.

Reviewing violation statistics for security profiles

You can view statistics and transaction information for each security profile that triggers security violations.
  1. On the Main tab, click Security > Event Logs > Protocol and click HTTP, FTP, SMTP, or DNS.
    The appropriate statistics screen opens listing all violations for that protocol, with the number of occurrences.
  2. Type a Support ID, if you have one, to filter the violations and view one in particular.
  3. Click a violation's hyperlink to see details about the requests causing the violation.
    On the Statistics screen, in the left column, you can review information regarding the traffic volume for each security profile configured.
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