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authorMatthew Hodgson <matthew@matrix.org>2018-05-01 18:28:14 +0100
committerMatthew Hodgson <matthew@matrix.org>2018-05-01 18:28:23 +0100
commit8e6bd0e32456e66ec8df3af62ecacf291cf4632f (patch)
treebaf5fd6d2a3f4aa1c42c14d8ecf2949f9721f046 /CHANGES.rst
parentUpdate __init__.py (diff)
downloadsynapse-8e6bd0e32456e66ec8df3af62ecacf291cf4632f.tar.xz
changelog for 0.28.1 v0.28.1
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-Changes in synapse v0.28.0-rc1 (2018-04-26)
-===========================================
+Changes in synapse v0.28.1 (2018-05-01)
+=======================================
+
+SECURITY UPDATE
+
+* Clamp the allowed values of event depth received over federation to be
+  [0, 2**63 - 1].  This mitigates an attack where malicious events
+  injected with depth = 2**63 - 1 render rooms unusable.  Depth is used to
+  determine the cosmetic ordering of events within a room, and so the ordering
+  of events in such a room will default to using stream_ordering rather than depth
+  (topological_ordering).
+
+  This is a temporary solution to mitigate abuse in the wild, whilst a long solution
+  is being implemented to improve how the depth parameter is used.
+
+  Full details at
+  https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#
+
+* Pin Twisted to <18.4 until we stop using the private _OpenSSLECCurve API.
+
+
+Changes in synapse v0.28.0 (2018-04-26)
+=======================================
 
 Bug Fixes: