CVE-2019-0604 SharePoint unauthenticated RCE redux

[Robbie Wiggins 3]

Any one got a way to fingerprint a vuln site loads error out when hitting the right endpoint and one or two are blank.

 

Sorry, something went wrong
Could not load type 'Microsoft.SharePoint.Portal.WebControls.ItemPickerDialog' from assembly 'Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c'.
Technical Details

Any one able to confirm?

 

Endpoint to hit should be 

/_layouts/15/picker.aspx?PickerDialogType=Microsoft.SharePoint.Portal.WebControls.ItemPickerDialog

 

Edited December 19, 2019 by Robbie Wiggins

[Kevin Beaumont 111]

So I saw some exploitation of this in wild yesterday, looks like:

Quote

GET /_layouts/15/Picker.aspx - 80 - 84.16.244.47 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 359
GET /_layouts/15/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 84.16.244.47 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 312
POST /_layouts/15/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 84.16.244.47 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 1312
GET /_layouts/Picker.aspx - 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 302 0 0 46
GET /_layouts/15/Picker.aspx - 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 374
GET /_layouts/15/Picker.aspx - 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 31
GET /_layouts/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 302 0 0 281
GET /_layouts/15/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 421
GET /_layouts/15/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 578
POST /_layouts/15/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 468
GET /_layouts/15/downloadexternaldata.aspx - 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 401 0 0 10578
POST /_layouts/Picker.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 200 0 0 8984
GET /_layouts/15/downloadexternaldata.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 401 0 0 93
POST /_layouts/15/downloadexternaldata.aspx PickerDialogType=Microsoft.SharePoint.WebControls.ItemPickerDialog,+Microsoft.SharePoint,+Version=15.0.0.0,+Culture=neutral,+PublicKeyToken=71e9bce111e9429c 80 - 82.102.21.249 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:70.0)+Gecko/20100101+Firefox/70.0 - 401 0 0 124

Obviously the POST statements aren't there.

Triggers code execution like this:

Edited February 12 by Kevin Beaumont
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