GMS-2020-10: Implementation trusts the "me" field returned by the authorization server without verifying it

November 24, 2020

Impact

A malicious user can sign in as a user with any IndieAuth identifier. This is because the implementation does not verify that the final "me" URL value returned by the authorization server belongs to the same domain as the initial value entered by the user.

Patches

fixes this issue.

Workarounds

There is no workaround. Upgrade to immediately.

References

Security Considerations: Differing User Profile URLs in the IndieAuth specification.

For more information

If you have any questions or comments about this advisory:

Open an issue in simonw/datasette-indieauth

References

github.com/advisories/GHSA-mjcr-rqjg-rhg3
github.com/simonw/datasette-indieauth/security/advisories/GHSA-mjcr-rqjg-rhg3
pypi.org/project/datasette-indieauth/

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