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Mitigate media repo XSSs on IE11. #10468

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Jul 27, 2021
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Mitigate media repo XSSs on IE11. #10468

merged 2 commits into from
Jul 27, 2021

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@dkasak dkasak commented Jul 23, 2021

IE11 doesn't support Content-Security-Policy but it has support for
a non-standard X-Content-Security-Policy header, which only supports the
sandbox directive. This prevents script execution, so it at least offers
some protection against media repo-based attacks.

Signed-off-by: Denis Kasak dkasak@termina.org.uk

Pull Request Checklist

  • Pull request is based on the develop branch
  • Pull request includes a changelog file. The entry should:
    • Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from EventStore to EventWorkerStore.".
    • Use markdown where necessary, mostly for code blocks.
    • End with either a period (.) or an exclamation mark (!).
    • Start with a capital letter.
  • Pull request includes a sign off
  • Code style is correct (run the linters)

dkasak added 2 commits July 23, 2021 15:55
IE11 doesn't support Content-Security-Policy but it has support for
a non-standard X-Content-Security-Policy header, which only supports the
sandbox directive. This prevents script execution, so it at least offers
some protection against media repo-based attacks.

Signed-off-by: Denis Kasak <dkasak@termina.org.uk>
@dkasak dkasak requested a review from a team July 23, 2021 14:17
@dkasak dkasak merged commit 2476d53 into develop Jul 27, 2021
@dkasak dkasak deleted the dkasak/add-ie11-xcsp branch July 27, 2021 11:45
aaronraimist added a commit to aaronraimist/synapse that referenced this pull request Aug 13, 2021
Synapse 1.40.0 (2021-08-10)
===========================

No significant changes.

Synapse 1.40.0rc3 (2021-08-09)
==============================

Features
--------

- Support [MSC3289: room version 8](matrix-org/matrix-spec-proposals#3289). ([\matrix-org#10449](matrix-org#10449))

Bugfixes
--------

- Mark the experimental room version from [MSC2716](matrix-org/matrix-spec-proposals#2716) as unstable. ([\matrix-org#10449](matrix-org#10449))

Improved Documentation
----------------------

- Fix broken links in `upgrade.md`. Contributed by @dklimpel. ([\matrix-org#10543](matrix-org#10543))

Synapse 1.40.0rc2 (2021-08-04)
==============================

Bugfixes
--------

- Fix the `PeriodicallyFlushingMemoryHandler` inhibiting application shutdown because of its background thread. ([\matrix-org#10517](matrix-org#10517))
- Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update read receipts. ([\matrix-org#10531](matrix-org#10531))

Internal Changes
----------------

- Fix release script to open the correct URL for the release. ([\matrix-org#10516](matrix-org#10516))

Synapse 1.40.0rc1 (2021-08-03)
==============================

Features
--------

- Add support for [MSC2033](matrix-org/matrix-spec-proposals#2033): `device_id` on `/account/whoami`. ([\matrix-org#9918](matrix-org#9918))
- Update support for [MSC2716 - Incrementally importing history into existing rooms](matrix-org/matrix-spec-proposals#2716). ([\matrix-org#10245](matrix-org#10245), [\matrix-org#10432](matrix-org#10432), [\matrix-org#10463](matrix-org#10463))
- Update support for [MSC3083](matrix-org/matrix-spec-proposals#3083) to consider changes in the MSC around which servers can issue join events. ([\matrix-org#10254](matrix-org#10254), [\matrix-org#10447](matrix-org#10447), [\matrix-org#10489](matrix-org#10489))
- Initial support for [MSC3244](matrix-org/matrix-spec-proposals#3244), Room version capabilities over the /capabilities API. ([\matrix-org#10283](matrix-org#10283))
- Add a buffered logging handler which periodically flushes itself. ([\matrix-org#10407](matrix-org#10407), [\matrix-org#10515](matrix-org#10515))
- Add support for https connections to a proxy server. Contributed by @Bubu and @dklimpel. ([\matrix-org#10411](matrix-org#10411))
- Support for [MSC2285 (hidden read receipts)](matrix-org/matrix-spec-proposals#2285). Contributed by @SimonBrandner. ([\matrix-org#10413](matrix-org#10413))
- Email notifications now state whether an invitation is to a room or a space. ([\matrix-org#10426](matrix-org#10426))
- Allow setting transaction limit for database connections. ([\matrix-org#10440](matrix-org#10440), [\matrix-org#10511](matrix-org#10511))
- Add `creation_ts` to "list users" admin API. ([\matrix-org#10448](matrix-org#10448))

Bugfixes
--------

- Improve character set detection in URL previews by supporting underscores (in addition to hyphens). Contributed by @srividyut. ([\matrix-org#10410](matrix-org#10410))
- Fix events being incorrectly rejected over federation if they reference auth events that the server needed to fetch. ([\matrix-org#10439](matrix-org#10439))
- Fix `synapse_federation_server_oldest_inbound_pdu_in_staging` Prometheus metric to not report a max age of 51 years when the queue is empty. ([\matrix-org#10455](matrix-org#10455))
- Fix a bug which caused an explicit assignment of power-level 0 to a user to be misinterpreted in rare circumstances. ([\matrix-org#10499](matrix-org#10499))

Improved Documentation
----------------------

- Fix hierarchy of providers on the OpenID page. ([\matrix-org#10445](matrix-org#10445))
- Consolidate development documentation to `docs/development/`. ([\matrix-org#10453](matrix-org#10453))
- Add some developer docs to explain room DAG concepts like `outliers`, `state_groups`, `depth`, etc. ([\matrix-org#10464](matrix-org#10464))
- Document how to use Complement while developing a new Synapse feature. ([\matrix-org#10483](matrix-org#10483))

Internal Changes
----------------

- Prune inbound federation queues for a room if they get too large. ([\matrix-org#10390](matrix-org#10390))
- Add type hints to `synapse.federation.transport.client` module. ([\matrix-org#10408](matrix-org#10408))
- Remove shebang line from module files. ([\matrix-org#10415](matrix-org#10415))
- Drop backwards-compatibility code that was required to support Ubuntu Xenial. ([\matrix-org#10429](matrix-org#10429))
- Use a docker image cache for the prerequisites for the debian package build. ([\matrix-org#10431](matrix-org#10431))
- Improve servlet type hints. ([\matrix-org#10437](matrix-org#10437), [\matrix-org#10438](matrix-org#10438))
- Replace usage of `or_ignore` in `simple_insert` with `simple_upsert` usage, to stop spamming postgres logs with spurious ERROR messages. ([\matrix-org#10442](matrix-org#10442))
- Update the `tests-done` Github Actions status. ([\matrix-org#10444](matrix-org#10444), [\matrix-org#10512](matrix-org#10512))
- Update type annotations to work with forthcoming Twisted 21.7.0 release. ([\matrix-org#10446](matrix-org#10446), [\matrix-org#10450](matrix-org#10450))
- Cancel redundant GHA workflows when a new commit is pushed. ([\matrix-org#10451](matrix-org#10451))
- Mitigate media repo XSS attacks on IE11 via the non-standard X-Content-Security-Policy header. ([\matrix-org#10468](matrix-org#10468))
- Additional type hints in the state handler. ([\matrix-org#10482](matrix-org#10482))
- Update syntax used to run complement tests. ([\matrix-org#10488](matrix-org#10488))
- Fix up type annotations to work with Twisted 21.7. ([\matrix-org#10490](matrix-org#10490))
- Improve type annotations for `ObservableDeferred`. ([\matrix-org#10491](matrix-org#10491))
- Extend release script to also tag and create GitHub releases. ([\matrix-org#10496](matrix-org#10496))
- Fix a bug which caused production debian packages to be incorrectly marked as 'prerelease'. ([\matrix-org#10500](matrix-org#10500))
babolivier added a commit to matrix-org/synapse-dinsic that referenced this pull request Sep 1, 2021
Synapse 1.40.0 (2021-08-10)
===========================

No significant changes.

Synapse 1.40.0rc3 (2021-08-09)
==============================

Features
--------

- Support [MSC3289: room version 8](matrix-org/matrix-spec-proposals#3289). ([\#10449](matrix-org/synapse#10449))

Bugfixes
--------

- Mark the experimental room version from [MSC2716](matrix-org/matrix-spec-proposals#2716) as unstable. ([\#10449](matrix-org/synapse#10449))

Improved Documentation
----------------------

- Fix broken links in `upgrade.md`. Contributed by @dklimpel. ([\#10543](matrix-org/synapse#10543))

Synapse 1.40.0rc2 (2021-08-04)
==============================

Bugfixes
--------

- Fix the `PeriodicallyFlushingMemoryHandler` inhibiting application shutdown because of its background thread. ([\#10517](matrix-org/synapse#10517))
- Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update read receipts. ([\#10531](matrix-org/synapse#10531))

Internal Changes
----------------

- Fix release script to open the correct URL for the release. ([\#10516](matrix-org/synapse#10516))

Synapse 1.40.0rc1 (2021-08-03)
==============================

Features
--------

- Add support for [MSC2033](matrix-org/matrix-spec-proposals#2033): `device_id` on `/account/whoami`. ([\#9918](matrix-org/synapse#9918))
- Update support for [MSC2716 - Incrementally importing history into existing rooms](matrix-org/matrix-spec-proposals#2716). ([\#10245](matrix-org/synapse#10245), [\#10432](matrix-org/synapse#10432), [\#10463](matrix-org/synapse#10463))
- Update support for [MSC3083](matrix-org/matrix-spec-proposals#3083) to consider changes in the MSC around which servers can issue join events. ([\#10254](matrix-org/synapse#10254), [\#10447](matrix-org/synapse#10447), [\#10489](matrix-org/synapse#10489))
- Initial support for [MSC3244](matrix-org/matrix-spec-proposals#3244), Room version capabilities over the /capabilities API. ([\#10283](matrix-org/synapse#10283))
- Add a buffered logging handler which periodically flushes itself. ([\#10407](matrix-org/synapse#10407), [\#10515](matrix-org/synapse#10515))
- Add support for https connections to a proxy server. Contributed by @Bubu and @dklimpel. ([\#10411](matrix-org/synapse#10411))
- Support for [MSC2285 (hidden read receipts)](matrix-org/matrix-spec-proposals#2285). Contributed by @SimonBrandner. ([\#10413](matrix-org/synapse#10413))
- Email notifications now state whether an invitation is to a room or a space. ([\#10426](matrix-org/synapse#10426))
- Allow setting transaction limit for database connections. ([\#10440](matrix-org/synapse#10440), [\#10511](matrix-org/synapse#10511))
- Add `creation_ts` to "list users" admin API. ([\#10448](matrix-org/synapse#10448))

Bugfixes
--------

- Improve character set detection in URL previews by supporting underscores (in addition to hyphens). Contributed by @srividyut. ([\#10410](matrix-org/synapse#10410))
- Fix events being incorrectly rejected over federation if they reference auth events that the server needed to fetch. ([\#10439](matrix-org/synapse#10439))
- Fix `synapse_federation_server_oldest_inbound_pdu_in_staging` Prometheus metric to not report a max age of 51 years when the queue is empty. ([\#10455](matrix-org/synapse#10455))
- Fix a bug which caused an explicit assignment of power-level 0 to a user to be misinterpreted in rare circumstances. ([\#10499](matrix-org/synapse#10499))

Improved Documentation
----------------------

- Fix hierarchy of providers on the OpenID page. ([\#10445](matrix-org/synapse#10445))
- Consolidate development documentation to `docs/development/`. ([\#10453](matrix-org/synapse#10453))
- Add some developer docs to explain room DAG concepts like `outliers`, `state_groups`, `depth`, etc. ([\#10464](matrix-org/synapse#10464))
- Document how to use Complement while developing a new Synapse feature. ([\#10483](matrix-org/synapse#10483))

Internal Changes
----------------

- Prune inbound federation queues for a room if they get too large. ([\#10390](matrix-org/synapse#10390))
- Add type hints to `synapse.federation.transport.client` module. ([\#10408](matrix-org/synapse#10408))
- Remove shebang line from module files. ([\#10415](matrix-org/synapse#10415))
- Drop backwards-compatibility code that was required to support Ubuntu Xenial. ([\#10429](matrix-org/synapse#10429))
- Use a docker image cache for the prerequisites for the debian package build. ([\#10431](matrix-org/synapse#10431))
- Improve servlet type hints. ([\#10437](matrix-org/synapse#10437), [\#10438](matrix-org/synapse#10438))
- Replace usage of `or_ignore` in `simple_insert` with `simple_upsert` usage, to stop spamming postgres logs with spurious ERROR messages. ([\#10442](matrix-org/synapse#10442))
- Update the `tests-done` Github Actions status. ([\#10444](matrix-org/synapse#10444), [\#10512](matrix-org/synapse#10512))
- Update type annotations to work with forthcoming Twisted 21.7.0 release. ([\#10446](matrix-org/synapse#10446), [\#10450](matrix-org/synapse#10450))
- Cancel redundant GHA workflows when a new commit is pushed. ([\#10451](matrix-org/synapse#10451))
- Mitigate media repo XSS attacks on IE11 via the non-standard X-Content-Security-Policy header. ([\#10468](matrix-org/synapse#10468))
- Additional type hints in the state handler. ([\#10482](matrix-org/synapse#10482))
- Update syntax used to run complement tests. ([\#10488](matrix-org/synapse#10488))
- Fix up type annotations to work with Twisted 21.7. ([\#10490](matrix-org/synapse#10490))
- Improve type annotations for `ObservableDeferred`. ([\#10491](matrix-org/synapse#10491))
- Extend release script to also tag and create GitHub releases. ([\#10496](matrix-org/synapse#10496))
- Fix a bug which caused production debian packages to be incorrectly marked as 'prerelease'. ([\#10500](matrix-org/synapse#10500))
Fizzadar pushed a commit to Fizzadar/synapse that referenced this pull request Oct 26, 2021
Synapse 1.40.0 (2021-08-10)
===========================

No significant changes.

Synapse 1.40.0rc3 (2021-08-09)
==============================

Features
--------

- Support [MSC3289: room version 8](matrix-org/matrix-spec-proposals#3289). ([\matrix-org#10449](matrix-org#10449))

Bugfixes
--------

- Mark the experimental room version from [MSC2716](matrix-org/matrix-spec-proposals#2716) as unstable. ([\matrix-org#10449](matrix-org#10449))

Improved Documentation
----------------------

- Fix broken links in `upgrade.md`. Contributed by @dklimpel. ([\matrix-org#10543](matrix-org#10543))

Synapse 1.40.0rc2 (2021-08-04)
==============================

Bugfixes
--------

- Fix the `PeriodicallyFlushingMemoryHandler` inhibiting application shutdown because of its background thread. ([\matrix-org#10517](matrix-org#10517))
- Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update read receipts. ([\matrix-org#10531](matrix-org#10531))

Internal Changes
----------------

- Fix release script to open the correct URL for the release. ([\matrix-org#10516](matrix-org#10516))

Synapse 1.40.0rc1 (2021-08-03)
==============================

Features
--------

- Add support for [MSC2033](matrix-org/matrix-spec-proposals#2033): `device_id` on `/account/whoami`. ([\matrix-org#9918](matrix-org#9918))
- Update support for [MSC2716 - Incrementally importing history into existing rooms](matrix-org/matrix-spec-proposals#2716). ([\matrix-org#10245](matrix-org#10245), [\matrix-org#10432](matrix-org#10432), [\matrix-org#10463](matrix-org#10463))
- Update support for [MSC3083](matrix-org/matrix-spec-proposals#3083) to consider changes in the MSC around which servers can issue join events. ([\matrix-org#10254](matrix-org#10254), [\matrix-org#10447](matrix-org#10447), [\matrix-org#10489](matrix-org#10489))
- Initial support for [MSC3244](matrix-org/matrix-spec-proposals#3244), Room version capabilities over the /capabilities API. ([\matrix-org#10283](matrix-org#10283))
- Add a buffered logging handler which periodically flushes itself. ([\matrix-org#10407](matrix-org#10407), [\matrix-org#10515](matrix-org#10515))
- Add support for https connections to a proxy server. Contributed by @Bubu and @dklimpel. ([\matrix-org#10411](matrix-org#10411))
- Support for [MSC2285 (hidden read receipts)](matrix-org/matrix-spec-proposals#2285). Contributed by @SimonBrandner. ([\matrix-org#10413](matrix-org#10413))
- Email notifications now state whether an invitation is to a room or a space. ([\matrix-org#10426](matrix-org#10426))
- Allow setting transaction limit for database connections. ([\matrix-org#10440](matrix-org#10440), [\matrix-org#10511](matrix-org#10511))
- Add `creation_ts` to "list users" admin API. ([\matrix-org#10448](matrix-org#10448))

Bugfixes
--------

- Improve character set detection in URL previews by supporting underscores (in addition to hyphens). Contributed by @srividyut. ([\matrix-org#10410](matrix-org#10410))
- Fix events being incorrectly rejected over federation if they reference auth events that the server needed to fetch. ([\matrix-org#10439](matrix-org#10439))
- Fix `synapse_federation_server_oldest_inbound_pdu_in_staging` Prometheus metric to not report a max age of 51 years when the queue is empty. ([\matrix-org#10455](matrix-org#10455))
- Fix a bug which caused an explicit assignment of power-level 0 to a user to be misinterpreted in rare circumstances. ([\matrix-org#10499](matrix-org#10499))

Improved Documentation
----------------------

- Fix hierarchy of providers on the OpenID page. ([\matrix-org#10445](matrix-org#10445))
- Consolidate development documentation to `docs/development/`. ([\matrix-org#10453](matrix-org#10453))
- Add some developer docs to explain room DAG concepts like `outliers`, `state_groups`, `depth`, etc. ([\matrix-org#10464](matrix-org#10464))
- Document how to use Complement while developing a new Synapse feature. ([\matrix-org#10483](matrix-org#10483))

Internal Changes
----------------

- Prune inbound federation queues for a room if they get too large. ([\matrix-org#10390](matrix-org#10390))
- Add type hints to `synapse.federation.transport.client` module. ([\matrix-org#10408](matrix-org#10408))
- Remove shebang line from module files. ([\matrix-org#10415](matrix-org#10415))
- Drop backwards-compatibility code that was required to support Ubuntu Xenial. ([\matrix-org#10429](matrix-org#10429))
- Use a docker image cache for the prerequisites for the debian package build. ([\matrix-org#10431](matrix-org#10431))
- Improve servlet type hints. ([\matrix-org#10437](matrix-org#10437), [\matrix-org#10438](matrix-org#10438))
- Replace usage of `or_ignore` in `simple_insert` with `simple_upsert` usage, to stop spamming postgres logs with spurious ERROR messages. ([\matrix-org#10442](matrix-org#10442))
- Update the `tests-done` Github Actions status. ([\matrix-org#10444](matrix-org#10444), [\matrix-org#10512](matrix-org#10512))
- Update type annotations to work with forthcoming Twisted 21.7.0 release. ([\matrix-org#10446](matrix-org#10446), [\matrix-org#10450](matrix-org#10450))
- Cancel redundant GHA workflows when a new commit is pushed. ([\matrix-org#10451](matrix-org#10451))
- Mitigate media repo XSS attacks on IE11 via the non-standard X-Content-Security-Policy header. ([\matrix-org#10468](matrix-org#10468))
- Additional type hints in the state handler. ([\matrix-org#10482](matrix-org#10482))
- Update syntax used to run complement tests. ([\matrix-org#10488](matrix-org#10488))
- Fix up type annotations to work with Twisted 21.7. ([\matrix-org#10490](matrix-org#10490))
- Improve type annotations for `ObservableDeferred`. ([\matrix-org#10491](matrix-org#10491))
- Extend release script to also tag and create GitHub releases. ([\matrix-org#10496](matrix-org#10496))
- Fix a bug which caused production debian packages to be incorrectly marked as 'prerelease'. ([\matrix-org#10500](matrix-org#10500))
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