Merge tag 'v1.23.1'

Synapse 1.23.1 (2020-12-09)
===========================

Due to the two security issues highlighted below, server administrators are
encouraged to update Synapse. We are not aware of these vulnerabilities being
exploited in the wild.

Security advisory
-----------------

The following issues are fixed in v1.23.1 and v1.24.0.

- There is a denial of service attack
  ([CVE-2020-26257](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26257))
  against the federation APIs in which future events will not be correctly sent
  to other servers over federation. This affects all servers that participate in
  open federation. (Fixed in [#8776](https://github.com/matrix-org/synapse/pull/8776)).

- Synapse may be affected by OpenSSL
  [CVE-2020-1971](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971).
  Synapse administrators should ensure that they have the latest versions of
  the cryptography Python package installed.

To upgrade Synapse along with the cryptography package:

* Administrators using the [`matrix.org` Docker
  image](https://hub.docker.com/r/matrixdotorg/synapse/) or the [Debian/Ubuntu
  packages from
  `matrix.org`](https://github.com/matrix-org/synapse/blob/master/INSTALL.md#matrixorg-packages)
  should ensure that they have version 1.24.0 or 1.23.1 installed: these images include
  the updated packages.
* Administrators who have [installed Synapse from
  source](https://github.com/matrix-org/synapse/blob/master/INSTALL.md#installing-from-source)
  should upgrade the cryptography package within their virtualenv by running:
  ```sh
  <path_to_virtualenv>/bin/pip install 'cryptography>=3.3'
  ```
* Administrators who have installed Synapse from distribution packages should
  consult the information from their distributions.

Bugfixes
--------

- Fix a bug in some federation APIs which could lead to unexpected behaviour if different parameters were set in the URI and the request body. ([\#8776](https://github.com/matrix-org/synapse/issues/8776))

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

- Add a maximum version for pysaml2 on Python 3.5. ([\#8898](https://github.com/matrix-org/synapse/issues/8898))

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