+ ==============================
+ Release Notes for Samba 4.13.8
+ April 29, 2021
+ ==============================
+
+
+This is a security release in order to address the following defect:
+
+o CVE-2021-20254: Negative idmap cache entries can cause incorrect group entries
+ in the Samba file server process token.
+
+
+=======
+Details
+=======
+
+o CVE-2021-20254:
+ The Samba smbd file server must map Windows group identities (SIDs) into unix
+ group ids (gids). The code that performs this had a flaw that could allow it
+ to read data beyond the end of the array in the case where a negative cache
+ entry had been added to the mapping cache. This could cause the calling code
+ to return those values into the process token that stores the group
+ membership for a user.
+
+ Most commonly this flaw caused the calling code to crash, but an alert user
+ (Peter Eriksson, IT Department, Linköping University) found this flaw by
+ noticing an unprivileged user was able to delete a file within a network
+ share that they should have been disallowed access to.
+
+ Analysis of the code paths has not allowed us to discover a way for a
+ remote user to be able to trigger this flaw reproducibly or on demand,
+ but this CVE has been issued out of an abundance of caution.
+
+
+Changes since 4.13.7
+--------------------
+
+o Volker Lendecke <vl@samba.org>
+ * BUG 14571: CVE-2021-20254: Fix buffer overrun in sids_to_unixids().
+
+
+#######################################
+Reporting bugs & Development Discussion
+#######################################
+
+Please discuss this release on the samba-technical mailing list or by
+joining the #samba-technical IRC channel on irc.freenode.net.
+
+If you do report problems then please try to send high quality
+feedback. If you don't provide vital information to help us track down
+the problem then you will probably be ignored. All bug reports should
+be filed under the Samba 4.1 and newer product in the project's Bugzilla
+database (https://bugzilla.samba.org/).
+
+
+======================================================================
+== Our Code, Our Bugs, Our Responsibility.
+== The Samba Team
+======================================================================
+
+
+Release notes for older releases follow:
+----------------------------------------
+
+
==============================
Release Notes for Samba 4.13.7
March 24, 2021
======================================================================
-Release notes for older releases follow:
-----------------------------------------
+----------------------------------------------------------------------
==============================