Updated samba packages has been released to address two regressions introduced by the previous update

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Debian Security Advisory DSA-3816-2 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
April 02, 2017 https://www.debian.org/security/faq
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Package : samba
Debian Bug : 858564 858590 858648 859101

Two regressions were introduced by the samba update in DSA-3816-1.
Updated packages are now available to address these problems.
Additionally a regression from DSA-3548-1 causing `net ads join` to
freeze when run a second time is fixed along with this update. For
reference, the original advisory text follows.

Jann Horn of Google discovered a time-of-check, time-of-use race
condition in Samba, a SMB/CIFS file, print, and login server for Unix. A
malicious client can take advantage of this flaw by exploiting a symlink
race to access areas of the server file system not exported under a
share definition.

For the stable distribution (jessie), these problems have been fixed in
version 2:4.2.14+dfsg-0+deb8u5.

We recommend that you upgrade your samba packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

  Samba regression update for Debian