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Add Content Security Policy to Dweets

See original GitHub issue

Currently, it’s possible to write a dweet that pulls in resources from outside sources (scripts, images, videos, etc).

A content security policy (CSP) can be used to block external resources from being loaded on dweet pages (// - the inner page of the iframe).

This would block dweets from pulling in external resources, which can be used as a means of bypassing the 140 byte limit or to execute cross-site request forgeries.

Making this change does come with one caveat, which is that it would break any existing dweets that make use of external resources. Not to pick on cantelope specifically, but here are some of his dweets as examples:

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Reactions:6
  • Comments:11 (4 by maintainers)

github_iconTop GitHub Comments

nderscorecommented, Oct 23, 2017

@atesgoral For example, a dweet containing the following snippet could be used to force users to log out of the site:

document.write("<img src='//'>")
lionleafcommented, Aug 6, 2018

This is completed now, but see #367 for some remaining issues. Closing

Read more comments on GitHub >

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