403Bypasser

403Bypasser

A Burp Suite extension made to automate the process of bypassing 403 pages. Heavily based on Orange Tsai's talk Breaking Parser Logic: Take Your Path Normalization off and Pop 0days Out!

Features

• Runs with every possible permutation for query-based payloads. For instance https://www.example.com/api/v1/users with payload ..; will result in testing the following:

  https://www.example.com..;/api/v1/users
  https://www.example.com/api..;/v1/users
  https://www.example.com/api/v1..;/users
  https://www.example.com/..;api/v1/users
  https://www.example.com/api/..;v1/users
  https://www.example.com/api/v1/..;users
  https://www.example.com/api/v1/users/..;
  https://www.example.com/api/v1/users/..;/
  

• Header payloads are added to the original request. In case the header already exists in the original request its value is replaced.
• For GET requests the extension will try to bypass Forbidden pages by changing the method to POST with an empty body.
• The extension will attempt to downgrade HTTP/1.1 to HTTP/1.0 and remove all headers as shown by Abbas.heybati
• Supports manual activation through context menu.
• Payloads are supplied by the user under dedicated tab, default values are stored in query payloads.txt and header payloads.txt.
• Issues are added under the Issue Activity tab.