Disallow admin triggering of internal endpoints #1030
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
weiminyu
approved these changes
Mar 22, 2021
There was a problem hiding this comment.
Reviewed 2 of 2 files at r1.
Reviewable status:complete! all files reviewed, all discussions resolved (waiting on @mindhog)
Stop simply relying on the presence of the X-AppEngine-QueueName as an
indicator that an endpoint has been triggered internally, as this allows
admins to trigger a remote execution vulnerability.
We now supplement this check by ensuring that there is no authenticated user.
Since only an admin user can set these headers, this means that the header
must have been set by an internal request.
Tested:
In addition to the new unit test, verified on Crash that:
- Internal requests are still getting authenticated via the internal auth
mechanism.
- Admin requests with the X-AppEngine-QueueName header are rejected as
"unauthorized."
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Stop simply relying on the presence of the X-AppEngine-QueueName as an
indicator that an endpoint has been triggered internally, as this allows
admins to trigger a remote execution vulnerability.
We now supplement this check by ensuring that there is no authenticated user.
Since only an admin user can set these headers, this means that the header
must have been set by an internal request.
Tested:
In addition to the new unit test, verified on Crash that:
mechanism.
"unauthorized."
This change is