Allowing file types .docx, .xlsx and .pptx as attachments
Description
Customers wishing to allow certain file types through a FortiGate and not blocked by Protection Profile file type blocking.
These type of files are seen as compressed .zip files so the configuration should allow or scan .zip files.
Solution
The extensions .docx, .xlsx and .pptx are all forms of XML compression in a ZIP format and have identifying characters
Hex: 50 4B 03 04 ASCII: PK..
The Microsoft documentation on Open XML Office 2007 file format available at http://msdn.microsoft.com/en-us/library/aa338205.aspx states that these file types are actually ZIP encoded.
Hex: 50 4B 03 04 ASCII: PK..
The Microsoft documentation on Open XML Office 2007 file format available at http://msdn.microsoft.com/en-us/library/aa338205.aspx states that these file types are actually ZIP encoded.
The blocking of the ZIP file type must be disabled in order to allow these file types to be passed.