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API Security

Manual Chapter v13.1.0: Implementing Web Services Security
Manual Chapter v13.1.0: Creating Parent and Child Security Policies

Fundamental, Enhanced, Comprehensive

Fundamental = Grundlegend
Enhanced = Verbessert
Comprehensive = Umfassend

The following is from the v12 UI (Security – Application Security : Policy Building : Learning and Blocking Settings, Policy Type)

Fundamental
 

Enhanced
Fundamental plus:

Comprehensive
Enhanced plus:
  • HTTP Protocol Compliance
  • Evasion Techniques
  • Learn New File Types + Lengths
  • Learn New Parameters in selective mode at Global level
  • Methods
  • Attack Signatures
  • Request length exceeds defined buffer size
  • Host Names
  • Failed to convert character
  • Learn New Redirection Domains
  • Bad WebSocket handshake request
  • Failure in WebSocket framing protocol
  • Mask not found in client frame
  • Null character found in WebSocket text message
  • Illegal websocket frame length
  • Illegal number of frames per message
  • Illegal binary message length
  • Illegal WebSocket extension
  • Learn New URLs in selective mode + Meta Characters
  • Learn New Parameters in selective mode + Lengths, at Global level
  • Learn New Cookies
  • Content Profiles
  • Bad WebSocket handshake request
  • Failure in WebSocket framing protocol
  • Mask not found in client frame
  • Null character found in WebSocket text message
  • Illegal websocket frame length
  • Illegal number of frames per message
  • Illegal binary message length
  • Illegal WebSocket extension
  • Illegal cross-origin request
  • Plain text data does not comply with format settings
  • Learn New URLs + Meta Characters, Classify Request Content
  • Learn New Parameters + Lengths, at URL level, Classify Value Content
  • Parameter Meta Characters
  • Dynamic Parameters: Using Statistics
  • CSRF URLs
  • Header Length
  • Cookie Length
  • Bad WebSocket handshake request
  • Failure in WebSocket framing protocol
  • Mask not found in client frame
  • Null character found in WebSocket text message
  • Illegal websocket frame length
  • Illegal number of frames per message
  • Illegal binary message length
  • Illegal WebSocket extension
  • Illegal cross-origin request
  • Plain text data does not comply with format settings
  • Binary content found in text only WebSocket
  • Text content found in binary only WebSocket

https://devcentral.f5.com/questions/asm-confusion-about-wildcard-selective-all-entities-49185
-> “Add All Entities Creates a comprehensive whitelist policy that includes all web site entities”

Learning Schemes to build a policy

  • Never (wildcard only), when false positive occur the system will suggest to relax the settings of the wildcard entity.
  • Selective is that only entity (Parameter name/value, URL etc) that exceeds the Wildcard setting would generate learning suggestion and those learning suggestion are accepted by administrator entity will get included in security policy.
    • Selective mode offers intermediate protection between Never (Wildcard Only) and Add All Entities.
    • Selective mode is suitable for applications containing entities which use similar or identical attributes.
    • Ideally, when you know the policy is mature, you can remove the wildcard
  • Add All Entities, you will see a suggestion to add an entity by name

BIG-IP ASM Policy Builder updates

BIG-IP 13.0

Updates to Policy Builder in BIG-IP 13.0 include the following enhancements:

  • Compact mode is an entity learning mode designed to effectively manage high traffic loads and increase policy security.
    • Compact mode reduces the amount of learning suggestions, enabling a policy to converge more quickly, and automatically adds disallowed file types.
    • Compact mode will never removing the wildcard.
  • Server Technologies is an option that customizes policies to an application. This option enables Policy Builder to identify the back-end technologies used by an application and add the relevant signatures to the policy.

  • Client Reputation is a technique that improves learning suggestions by using behavioral analysis to assign a reputation score to a source IP or device ID. Policy Builder ignores sources classified as malicious and speeds learning on sources classified as benign.

BIG-IP 12.0

There are several updates to Policy Builder in BIG-IP 12.0, including the following:

  • Staging, enforcement, and learning suggestions can be configured manually or by the BIG-IP ASM system.

  • Security checks Learn, Alarm, and Block are now system-wide settings integrated with Policy Builder.

  • An improved learning suggestions mechanism handles requests, with or without violations, for manual and automated policy building.

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