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Vulnerability of OpenSSH: privilege escalation via Scp Client Empty Dirname Permission Change

Synthesis of the vulnerability 

An attacker can bypass restrictions via Scp Client Empty Dirname Permission Change of OpenSSH, in order to escalate his privileges.
Vulnerable systems: Debian, Fedora, AIX, IBM i, OpenSSH, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity of this threat: 3/4.
Creation date: 11/01/2019.
Revision date: 14/01/2019.
Références of this weakness: bulletinjan2019, cpuapr2019, CVE-2018-20685, DLA-1728-1, DSA-4387-1, DSA-4387-2, FEDORA-2019-9eb0ae6296, FEDORA-2019-f6ff819834, ibm10731015, openSUSE-SU-2019:0091-1, openSUSE-SU-2019:0093-1, RHSA-2019:3702-01, SUSE-SU-2019:0125-1, SUSE-SU-2019:0126-1, SUSE-SU-2019:0132-1, SUSE-SU-2019:13931-1, USN-3885-1, USN-3885-2, VIGILANCE-VUL-28244.

Description of the vulnerability 

An attacker can bypass restrictions via Scp Client Empty Dirname Permission Change of OpenSSH, in order to escalate his privileges.
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This cybersecurity weakness impacts software or systems such as Debian, Fedora, AIX, IBM i, OpenSSH, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.

Our Vigil@nce team determined that the severity of this security vulnerability is important.

The trust level is of type confirmed by the editor, with an origin of internet server.

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

Solutions for this threat 

OpenSSH: patch for Scp Client Empty Dirname Permission Change.
A patch is indicated in information sources.

AIX: patch for OpenSSH.
A patch is available:
  https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp&S_PKG=openssh
Workarounds are required.

Cloud Foundry: fixed versions for OpenSSH.
Fixed versions are indicated in information sources.

Debian 8: new openssh packages.
New packages are available:
  Debian 8: openssh 1:6.7p1-5+deb8u8

Debian 9: new openssh packages.
New packages are available:
  Debian 9: openssh 1:7.4p1-10+deb9u6

Fedora: new openssh packages.
New packages are available:
  Fedora 28: openssh 7.8p1-4.fc28
  Fedora 29: openssh 7.9p1-3.fc29

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

openSUSE Leap 15.0: new openssh packages (28/01/2019).
New packages are available:
  openSUSE Leap 15.0: openssh 7.6p1-lp150.8.9.1

openSUSE Leap 42.3: new openssh packages (30/01/2019).
New packages are available:
  openSUSE Leap 42.3: openssh 7.2p2-29.1

Oracle Solaris: CPU of April 2019.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=2525967.1

Oracle Solaris: patch for third party software of January 2019 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 8: new openssh packages.
New packages are available:
  RHEL 8: openssh 8.0p1-3.el8

SUSE LE: new openssh packages.
New packages are available:
  SUSE LE 11 SP4: openssh 6.6p1-36.12.1
  SUSE LE 12 RTM: openssh 6.6p1-54.26.1
  SUSE LE 12 SP1: openssh 6.6p1-54.26.1
  SUSE LE 12 SP2: openssh 7.2p2-74.35.1
  SUSE LE 12 SP3: openssh 7.2p2-74.35.1
  SUSE LE 12 SP4: openssh 7.2p2-74.35.1
  SUSE LE 15 RTM: openssh 7.6p1-9.13.1

Synology DSM: version 6.2.2-24922.
The version 6.2.2-24922 is fixed.

Synology DS/RS: version 6.2.2-24922.
The version 6.2.2-24922 is fixed:
  https://www.synology.com/

Ubuntu: new openssh-client packages.
New packages are available:
  Ubuntu 18.10: openssh-client 1:7.7p1-4ubuntu0.3
  Ubuntu 18.04 LTS: openssh-client 1:7.6p1-4ubuntu0.3
  Ubuntu 16.04 LTS: openssh-client 1:7.2p2-4ubuntu2.8
  Ubuntu 14.04 LTS: openssh-client 1:6.6p1-2ubuntu2.13
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