Details

Application protocol anomaly detection examines application layer protocols such as FTP to identify attacks based on observed deviations in the normal RFC behavior of a protocol or service. This type of monitoring allows for the detection of known and unknown exploits that exploit weaknesses of commonly used protocols.

Since protocol anomaly analysis examines the application payload for patterns or anomalies, an FTP proxy must be included in the ALG. This ALG will be configured to inspect inbound and outbound FTP communications traffic to detect protocol anomalies such as malformed message and command insertion attacks.

Solution

Enable outbound FTP proxying to inspect this traffic for compliance and anomalies.

1. Log on to the Web Management Console.
2. Browse to Configuration >> Services >> Proxy Services.
3. Click the ‘Standard’, ‘Predefined Service Group’ and set FTP service to ‘Intercept’.
4. Click ‘Apply’.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_SYM_ProxySG_Y20M04_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management, System and Communications Protection.This control applies to the following type of system BlueCoat.

References

• 800-53|CM-6b.
• 800-53|SC-7(17)
• CAT|II
• CCI|CCI-000366
• CCI|CCI-001125
• Rule-ID|SV-104219r1_rule
• STIG-ID|SYMP-AG-000250
• Vuln-ID|V-94265

Source

• Tenable.com/audits