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  • simonw · 4 ✖

issue 1

  • Security issue: read-only canned queries leak CSRF token in URL · 4 ✖

author_association 1

  • OWNER · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
671075764 https://github.com/simonw/datasette/issues/918#issuecomment-671075764 https://api.github.com/repos/simonw/datasette/issues/918 MDEyOklzc3VlQ29tbWVudDY3MTA3NTc2NA== simonw 9599 2020-08-09T16:56:48Z 2020-08-09T16:56:48Z OWNER 
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 Security issue: read-only canned queries leak CSRF token in URL 675724951  
671071710 https://github.com/simonw/datasette/issues/918#issuecomment-671071710 https://api.github.com/repos/simonw/datasette/issues/918 MDEyOklzc3VlQ29tbWVudDY3MTA3MTcxMA== simonw 9599 2020-08-09T16:21:41Z 2020-08-09T16:21:41Z OWNER

Submitting the form on https://latest.datasette.io/fixtures/neighborhood_search demonstrates that this is fixed.

 
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 Security issue: read-only canned queries leak CSRF token in URL 675724951  
671070528 https://github.com/simonw/datasette/issues/918#issuecomment-671070528 https://api.github.com/repos/simonw/datasette/issues/918 MDEyOklzc3VlQ29tbWVudDY3MTA3MDUyOA== simonw 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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 Security issue: read-only canned queries leak CSRF token in URL 675724951  
671070486 https://github.com/simonw/datasette/issues/918#issuecomment-671070486 https://api.github.com/repos/simonw/datasette/issues/918 MDEyOklzc3VlQ29tbWVudDY3MTA3MDQ4Ng== simonw 9599 2020-08-09T16:11:59Z 2020-08-09T16:11:59Z OWNER 
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 Security issue: read-only canned queries leak CSRF token in URL 675724951  

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