issue_comments: 671070528

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html_url issue_url id node_id user created_at updated_at author_association body reactions issue performed_via_github_app
https://github.com/simonw/datasette/issues/918#issuecomment-671070528 https://api.github.com/repos/simonw/datasette/issues/918 671070528 MDEyOklzc3VlQ29tbWVudDY3MTA3MDUyOA== 9599 2020-08-09T16:12:16Z 2020-08-09T16:12:16Z OWNER

It's worth noting that in order to exploit this issue the following would all need to be true:

  • A user is running a copy of Datasette protected by a cookie-based authentication plugin AND configured with at least one writable canned query
  • An attacker is in control of a URL that could concievably be returned on a page that is displayed as the result of submitting a read-only canned query
  • An authenticated user of that Datasette instance, who is running a browser that doesn't support the SameSite=lax cookie parameter (which is widely supported by modern browsers), submits the read-only canned query form and then clicks a link to the attacker's off-site page, exposing their CSRFToken in the attacker's HTTP referer logs
  • The attacker then tricks that user into visiting their own malicious web page which includes a POST form that auto-submits against the writable canned query that the attacker wishes to exploit, including the CSRF token as a hidden field

The attacker would need full knowledge of the URL and form layout of the Datasette instance that they are exploiting.

 
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