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Vulnerability of Samba: directory traversal via Symlink

Synthesis of the vulnerability

An attacker can traverse directories via Symlink of Samba, in order to create a file outside the service root path.
Severity of this announce: 2/4.
Creation date: 08/04/2019.
Références of this computer vulnerability: bulletinjul2019, CERTFR-2019-AVI-149, CVE-2019-3880, DLA-1754-1, DSA-4427-1, FEDORA-2019-019c5314a0, FEDORA-2019-db21b5f1d2, ibm10880621, openSUSE-SU-2019:1180-1, openSUSE-SU-2019:1292-1, RHSA-2019:2099-01, RHSA-2019:3582-01, SUSE-SU-2019:1037-1, SUSE-SU-2019:1040-1, SUSE-SU-2019:1194-1, SUSE-SU-2019:1195-1, SUSE-SU-2019:1203-1, SUSE-SU-2019:14042-1, USN-3939-1, USN-3939-2, VIGILANCE-VUL-28963.

Description of the vulnerability

An attacker can traverse directories via Symlink of Samba, in order to create a file outside the service root path.
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This weakness bulletin impacts software or systems such as Debian, Fedora, IBM i, openSUSE Leap, Solaris, RHEL, Samba, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness is medium.

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

An attacker with a expert ability can exploit this vulnerability announce.

Solutions for this threat

Samba: version 4.10.2.
The version 4.10.2 is fixed:
  https://download.samba.org/pub/samba/stable/

Samba: version 4.9.6.
The version 4.9.6 is fixed:
  https://download.samba.org/pub/samba/stable/

Samba: version 4.8.11.
The version 4.8.11 is fixed:
  https://download.samba.org/pub/samba/stable/

Debian 8: new samba packages.
New packages are available:
  Debian 8: samba 2:4.2.14+dfsg-0+deb8u12

Debian 9: new samba packages.
New packages are available:
  Debian 9: samba 2:4.5.16+dfsg-1+deb9u1

Fedora 28: new samba packages.
New packages are available:
  Fedora 28: samba 4.8.11-0.fc28

Fedora 29: new samba packages.
New packages are available:
  Fedora 29: samba 4.9.6-0.fc29

IBM i: patch for Samba.
A patch is indicated in information sources.

openSUSE Leap: new samba packages.
New packages are available:
  openSUSE Leap 15.0: samba 4.7.11+git.153.b36ceaf2235-lp150.3.14.1
  openSUSE Leap 42.3: samba 4.6.16+git.154.2998451b912-27.1

Oracle Solaris: patch for third party software of July 2019 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 7: new samba packages.
New packages are available:
  RHEL 7: samba 4.9.1-6.el7

RHEL 8: new samba packages.
New packages are available:
  RHEL 8: samba 4.10.4-1.el8

SUSE LE 12: new samba packages.
New packages are available:
  SUSE LE 12 RTM: samba 4.2.4-18.52.1
  SUSE LE 12 SP1: samba 4.2.4-28.32.1
  SUSE LE 12 SP2: samba 4.4.2-38.25.1

SUSE LE: new samba packages.
New packages are available:
  SUSE LE 11 SP4: samba 32bit-3.6.3-94.19.2
  SUSE LE 12 SP4: samba 4.6.16+git.154.2998451b912-3.40.3
  SUSE LE 12 SP3: samba 4.6.16+git.154.2998451b912-3.40.3
  SUSE LE 15 RTM: samba 4.7.11+git.153.b36ceaf2235-4.27.1

Ubuntu: new samba packages.
New packages are available:
  Ubuntu 18.10: samba 2:4.8.4+dfsg-2ubuntu2.3
  Ubuntu 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.9
  Ubuntu 16.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.16.04.19
  Ubuntu 14.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.14.04.20
  Ubuntu 12.04 ESM: samba 2:3.6.25-0ubuntu0.12.04.17

Wind River Linux: solution (21/05/2019).
The solution is indicated in information sources.
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