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))

1 files changed, 54 insertions, 0 deletions

diff --git a/CHANGES.md b/CHANGES.md
index 677afeebc3..81b12e9b91 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -44,6 +44,58 @@ Internal Changes
 - Add a maximum version for pysaml2 on Python 3.5. ([\#8898](https://github.com/matrix-org/synapse/issues/8898))
 
 
+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))
+
+
 Synapse 1.24.0rc2 (2020-12-04)
 ==============================
 
@@ -131,6 +183,8 @@ Internal Changes
 - Allow for specifying a room version when creating a room in unit tests via `RestHelper.create_room_as`. ([\#8854](https://github.com/matrix-org/synapse/issues/8854))
 
 
+
+
 Synapse 1.23.0 (2020-11-18)
 ===========================