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Vulnerability of Samba: read-write access via SMB Symlink Race

Synthesis of the vulnerability 

An attacker can bypass access restrictions via SMB Symlink Race of Samba, in order to read or alter data.
Impacted software: Debian, Fedora, Junos Space, openSUSE Leap, Solaris, RHEL, Samba, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 23/03/2017.
Références of this announce: 1039, bulletinapr2017, CERTFR-2017-AVI-091, CVE-2017-2619, DLA-894-1, DSA-3816-1, DSA-3816-2, FEDORA-2017-97fb93e1d1, FEDORA-2017-c22a1dbe8b, JSA10917, openSUSE-SU-2017:0935-1, openSUSE-SU-2017:0944-1, RHSA-2017:1265-01, RHSA-2017:2789-01, SSA:2017-082-02, SSA:2017-091-01, SUSE-SU-2017:0841-1, SUSE-SU-2017:0858-1, SUSE-SU-2017:0859-1, SUSE-SU-2017:0862-1, SUSE-SU-2017:1216-1, USN-3242-1, USN-3242-2, USN-3267-1, VIGILANCE-VUL-22234.

Description of the vulnerability 

An attacker can bypass access restrictions via SMB Symlink Race of Samba, in order to read or alter data.
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This computer weakness impacts software or systems such as Debian, Fedora, Junos Space, openSUSE Leap, Solaris, RHEL, Samba, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability note is medium.

The trust level is of type confirmed by the editor, with an origin of user account.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this cybersecurity threat.

Solutions for this threat 

Samba: version 4.6.1.
The version 4.6.1 is fixed:
  https://bugzilla.samba.org/

Samba: version 4.5.7.
The version 4.5.7 is fixed:
  https://bugzilla.samba.org/

Samba: version 4.4.12.
The version 4.4.12 is fixed:
  https://bugzilla.samba.org/

Debian: new samba packages.
New packages are available:
  Debian 7: samba 2:3.6.6-6+deb7u12
  Debian 8: samba 2:4.2.14+dfsg-0+deb8u5

Fedora: new samba packages.
New packages are available:
  Fedora 24: samba 4.4.13-1.fc24
  Fedora 25: samba 4.5.8-0.fc25

Junos Space: version 18.4R1.
The version 18.4R1 is fixed.

openSUSE Leap: new samba packages.
New packages are available:
  openSUSE Leap 42.1: samba 4.2.4-27.1
  openSUSE Leap 42.2: samba 4.4.2-11.3.1

Oracle Solaris: patch for third party software of April 2017 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 6.9: new samba packages.
New packages are available:
  RHEL 6: samba 3.6.23-45.el6_9

RHEL 7.3: new samba packages.
New packages are available:
  RHEL 7: samba 4.4.4-13.el7_3

Slackware: new samba packages.
New packages are available:
  Slackware 14.0: samba 4.4.13-*-1_slack14.0
  Slackware 14.1: samba 4.4.13-*-1_slack14.1
  Slackware 14.2: samba 4.4.13-*-1_slack14.2

SUSE LE 11: new samba packages.
New packages are available:
  SUSE LE 11 SP3: samba 3.6.3-90.1
  SUSE LE 11 SP4: samba 3.6.3-90.1

SUSE LE 12: new samba packages.
New packages are available:
  SUSE LE 12 RTM: samba 4.2.4-18.35.1
  SUSE LE 12 SP1: samba 4.2.4-28.8.2
  SUSE LE 12 SP2: samba 4.4.2-36.2

Synology DSM: version 6.1.2-15132.
The version 6.1.2-15132 is fixed.

Ubuntu 17.04: new samba packages.
New packages are available:
  Ubuntu 17.04: samba 2:4.5.8+dfsg-0ubuntu0.17.04.1

Ubuntu: new samba packages.
New packages are available:
  Ubuntu 16.10: samba 2:4.4.5+dfsg-2ubuntu5.5
  Ubuntu 16.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.16.04.6
  Ubuntu 14.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.14.04.7
  Ubuntu 12.04 LTS: samba 2:3.6.25-0ubuntu0.12.04.10
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