Karolin Seeger
2021-Apr-29 08:59 UTC
[Announce] Samba 4.14.4, 4.13.8 and 4.12.15 Security Releases Available
Release Announcements
---------------------
These are security releases 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, Link?ping 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
-------
o Volker Lendecke <vl at 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
=====================================================================
===============Download Details
===============
The uncompressed tarballs and patch files have been signed
using GnuPG (ID AA99442FB680B620). The source code can be downloaded
from:
https://download.samba.org/pub/samba/stable/
The release notes are available online at:
https://www.samba.org/samba/history/samba-4.14.4.html
https://www.samba.org/samba/history/samba-4.13.8.html
https://www.samba.org/samba/history/samba-4.12.15.html
Our Code, Our Bugs, Our Responsibility.
(https://bugzilla.samba.org/)
--Enjoy
The Samba Team
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