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Vulnerability of libssh: privilege escalation via Server Mode

Synthesis of the vulnerability 

An attacker can bypass restrictions via Server Mode of libssh, in order to escalate his privileges.
Impacted products: Debian, BIG-IP Hardware, TMOS, Fedora, MariaDB ~ precise, MySQL Community, MySQL Enterprise, openSUSE Leap, Percona Server, XtraBackup, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu, AdminBastion.
Severity of this bulletin: 4/4.
Creation date: 17/10/2018.
Références of this threat: CERTFR-2018-ALE-012, CERTFR-2018-AVI-499, cpujan2019, CVE-2018-10933, DLA-1548-1, DSA-4322-1, FEDORA-2018-6b390ceb36, FEDORA-2018-bca1c1ab49, FEDORA-2018-c08cd808d3, K52868493, openSUSE-SU-2018:3200-1, openSUSE-SU-2018:3245-1, SSA:2018-289-01, SUSE-SU-2018:3162-1, SUSE-SU-2018:3253-1, USN-3795-1, USN-3795-2, USN-3795-3, VIGILANCE-VUL-27513.

Description of the vulnerability 

An attacker can bypass restrictions via Server Mode of libssh, in order to escalate his privileges.
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This cybersecurity alert impacts software or systems such as Debian, BIG-IP Hardware, TMOS, Fedora, MariaDB ~ precise, MySQL Community, MySQL Enterprise, openSUSE Leap, Percona Server, XtraBackup, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu, AdminBastion.

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

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

Solutions for this threat 

Debian 8: new libssh packages.
New packages are available:
  Debian 8: libssh 0.6.3-4+deb8u3

Debian 9: new libssh packages.
New packages are available:
  Debian 9: libssh 0.7.3-2+deb9u1

F5 BIG-IP: solution for libssh.
The solution is indicated in information sources.

Fedora: new libssh packages.
New packages are available:
  Fedora 27: libssh 0.7.6-1.fc27
  Fedora 28: libssh 0.8.4-1.fc28
  Fedora 29: libssh 0.8.4-1.fc29

MariaDB: version 5.5.63.
The version 5.5.63 is fixed:
  https://mariadb.com/downloads/

openSUSE Leap 15.0: new libssh packages.
New packages are available:
  openSUSE Leap 15.0: libssh 0.7.5-lp150.5.3.1

openSUSE Leap 42.3: new libssh packages.
New packages are available:
  openSUSE Leap 42.3: libssh 0.6.3-17.1

Oracle MySQL: version 5.6.43.
The version 5.6.43 is fixed:
  https://support.oracle.com/rs?type=doc&id=2487644.1
  https://www.mysql.com/fr/

Oracle MySQL: version 5.7.25.
The version 5.7.25 is fixed:
  https://support.oracle.com/rs?type=doc&id=2487644.1
  https://www.mysql.com/fr/

Oracle MySQL: version 8.0.14.
The version 8.0.14 is fixed:
  https://support.oracle.com/rs?type=doc&id=2487644.1
  https://www.mysql.com/fr/

Percona Server for MySQL: version 5.7.25-28.
The version 5.7.25-28 is fixed:
  https://www.percona.com/

Slackware: new libssh packages.
New packages are available:
  Slackware 14.0: libssh 0.7.6-*-1_slack14.0
  Slackware 14.1: libssh 0.7.6-*-1_slack14.1
  Slackware 14.2: libssh 0.7.6-*-1_slack14.2

SUSE LE 12 SP3: new libssh packages.
New packages are available:
  SUSE LE 12 SP3: libssh 0.6.3-12.6.1

SUSE LE 15: new libssh packages.
New packages are available:
  SUSE LE 15 RTM: libssh 0.7.5-6.3.1

Ubuntu: new libssh-4 packages.
New packages are available:
  Ubuntu 18.10: libssh-4 0.8.1-1ubuntu0.3
  Ubuntu 18.04 LTS: libssh-4 0.8.0~20170825.94fa1e38-1ubuntu0.2
  Ubuntu 16.04 LTS: libssh-4 0.6.3-4.3ubuntu0.2
  Ubuntu 14.04 LTS: libssh-4 0.6.1-0ubuntu3.5

WALLIX Bastion: fixed versions for libssh.
Fixed versions are indicated in information sources.
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