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Vulnerability of OpenSSH: information disclosure via Username Enumeration

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Username Enumeration of OpenSSH, in order to obtain sensitive information.
Impacted software: Blue Coat CAS, ProxySG par Blue Coat, SGOS by Blue Coat, Debian, VNX Operating Environment, VNX Series, Fedora, AIX, QRadar SIEM, McAfee Web Gateway, Data ONTAP 7-Mode, OpenSSH, openSUSE Leap, Solaris, pfSense, RHEL, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Symantec Content Analysis, ProxySG by Symantec, SGOS by Symantec, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 16/08/2018.
Références of this announce: 1170352, bulletinjan2019, CERTFR-2018-AVI-410, CVE-2018-15473, DLA-1474-1, DSA-2019-131, DSA-4280-1, FEDORA-2018-065a7722ee, FEDORA-2018-f56ded11c4, NTAP-20181101-0001, openSUSE-SU-2018:3801-1, openSUSE-SU-2018:3946-1, RHSA-2019:0711-01, RHSA-2019:2143-01, SB10267, SSB-439005, SUSE-SU-2018:3540-1, SUSE-SU-2018:3686-1, SUSE-SU-2018:3768-1, SUSE-SU-2018:3776-1, SUSE-SU-2018:3781-1, SUSE-SU-2018:3910-1, SYMSA1469, USN-3809-1, VIGILANCE-VUL-27016.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Username Enumeration of OpenSSH, in order to obtain sensitive information.
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This vulnerability alert impacts software or systems such as Blue Coat CAS, ProxySG par Blue Coat, SGOS by Blue Coat, Debian, VNX Operating Environment, VNX Series, Fedora, AIX, QRadar SIEM, McAfee Web Gateway, Data ONTAP 7-Mode, OpenSSH, openSUSE Leap, Solaris, pfSense, RHEL, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Symantec Content Analysis, ProxySG by Symantec, SGOS by Symantec, Synology DSM, Synology DS***, Synology RS***, Ubuntu.

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

The trust level is of type confirmed by the editor, with an origin of intranet client.

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 computer vulnerability.

Solutions for this threat 

OpenSSH: version 7.8.
The version 7.8 is fixed:
  http://www.openssh.com/

OpenSSH: patch for Username Enumeration.
A patch is indicated in information sources.

AIX: patch for OpenSSH.
A patch is indicated in information sources.

Copssh: version 6.3.0.
The version 6.3.0 is fixed:
  https://www.itefix.net/copssh

Debian 8: new openssh packages.
New packages are available:
  Debian 8: openssh 1:6.7p1-5+deb8u5

Debian 9: new openssh packages.
New packages are available:
  Debian 9: openssh 1:7.4p1-10+deb9u4

Dell EMC VNXe3200: version 3.1.10.9946299.
The version 3.1.10.9946299 is fixed:
  https://www.dell.com/

Fedora: new openssh packages.
New packages are available:
  Fedora 27: openssh 7.6p1-6.fc27
  Fedora 28: openssh 7.8p1-1.fc28

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

McAfee Web Gateway: patch for OpenSSH/GnuTLS.
A patch is indicated in information sources.

openSUSE Leap 15.0: new openssh packages.
New packages are available:
  openSUSE Leap 15.0: openssh 7.6p1-lp150.8.3.1

openSUSE Leap 42.3: new openssh packages.
New packages are available:
  openSUSE Leap 42.3: openssh 7.2p2-25.1

Oracle Solaris: patch for third party software of January 2019 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

pfSense: version 2.4.4.
The version 2.4.4 is fixed:
  https://www.netgate.com/

RHEL 6.10: new openssh packages.
New packages are available:
  RHEL 6: openssh 5.3p1-124.el6_10

RHEL 7: new openssh packages.
New packages are available:
  RHEL 7: openssh 7.4p1-21.el7

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

SUSE LE 11: new openssh-openssl1 packages.
New packages are available:
  SUSE LE 11 RTM-SP4: openssh-openssl1 6.6p1-19.6.1

SUSE LE 11 SP3: new openssh packages.
New packages are available:
  SUSE LE 11 SP3: openssh 6.2p2-0.41.5.1

SUSE LE 11 SP4: new openssh packages.
New packages are available:
  SUSE LE 11 SP4: openssh 6.6p1-36.6.1

SUSE LE 12: new openssh packages.
New packages are available:
  SUSE LE 12 SP2: openssh 7.2p2-74.30.1
  SUSE LE 12 SP3: openssh 7.2p2-74.30.1
  SUSE LE 12 SP4: openssh 7.2p2-74.30.1

SUSE LE 12 RTM/SP1: new openssh packages.
New packages are available:
  SUSE LE 12 RTM: openssh 6.6p1-54.18.1
  SUSE LE 12 SP1: openssh 6.6p1-54.18.1

SUSE LE 15: new openssh packages.
New packages are available:
  SUSE LE 15 RTM: openssh 7.6p1-9.3.1

Synology RS/DS: version 6.2.1-23824-1.
The version 6.2.1-23824-1 is fixed:
  https://www.synology.com/

Ubuntu: new openssh-server packages.
New packages are available:
  Ubuntu 18.04 LTS: openssh-server 1:7.6p1-4ubuntu0.1
  Ubuntu 16.04 LTS: openssh-server 1:7.2p2-4ubuntu2.6
  Ubuntu 14.04 LTS: openssh-server 1:6.6p1-2ubuntu2.11

Wind River Linux: solution (16/10/2018).
The solution is indicated in information sources.

Wind River Linux: solution (28/11/2018).
The solution is indicated in information sources.
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