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Vulnerability of PostgreSQL: denial of service via ALTER DEPENDS ON EXTENSION

Synthesis of the vulnerability 

An attacker can trigger a fatal error via ALTER DEPENDS ON EXTENSION of PostgreSQL, in order to trigger a denial of service.
Vulnerable systems: Debian, openSUSE Leap, PostgreSQL, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 13/02/2020.
Références of this weakness: CERTFR-2020-AVI-091, CVE-2020-1720, DLA-2105-1, DSA-4622-1, DSA-4623-1, openSUSE-SU-2020:0331-1, RHSA-2020:0980-01, SUSE-SU-2020:0586-1, SUSE-SU-2020:0589-1, SUSE-SU-2020:0715-1, SUSE-SU-2020:0752-1, USN-4282-1, VIGILANCE-VUL-31598.

Description of the vulnerability 

An attacker can trigger a fatal error via ALTER DEPENDS ON EXTENSION of PostgreSQL, in order to trigger a denial of service.
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This weakness note impacts software or systems such as Debian, openSUSE Leap, PostgreSQL, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat note 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 computer weakness.

Solutions for this threat 

PostgreSQL: version 12.2.
The version 12.2 is fixed:
  https://www.postgresql.org/download/

PostgreSQL: version 11.7.
The version 11.7 is fixed:
  https://www.postgresql.org/download/

PostgreSQL: version 10.12.
The version 10.12 is fixed:
  https://www.postgresql.org/download/

PostgreSQL: version 9.6.17.
The version 9.6.17 is fixed:
  https://www.postgresql.org/download/

PostgreSQL: version 9.5.21.
The version 9.5.21 is fixed:
  https://www.postgresql.org/download/

PostgreSQL: version 9.4.26.
The version 9.4.26 is fixed:
  https://www.postgresql.org/download/

Debian 10: new postgresql-11 packages.
New packages are available:
  Debian 10: postgresql-11 11.7-0+deb10u1

Debian 8: new postgresql-9.4 packages.
New packages are available:
  Debian 8: postgresql-9.4 9.4.26-0+deb8u1

Debian 9: new postgresql-9.6 packages.
New packages are available:
  Debian 9: postgresql-9.6 9.6.17-0+deb9u1

OpenSUSE Leap 15.1: new postgresql10 packages.
New packages are available:
  openSUSE Leap 15.1: postgresql10 10.12-lp151.2.9.1

RHEL 7: new rh-postgresql10 packages.
New packages are available:
  RHEL 7.0-7.7: rh-postgresql10 postgresql-10.12-2.el7

SUSE LE 12: new postgresql10 packages.
New packages are available:
  SUSE LE 12 SP1: postgresql10 10.12-1.18.1
  SUSE LE 12 SP2: postgresql10 10.12-1.18.1
  SUSE LE 12 SP3: postgresql10 10.12-1.18.1
  SUSE LE 12 SP4: postgresql10 10.12-1.18.1
  SUSE LE 12 SP5: postgresql10 10.12-1.18.1

SUSE LE 12: new postgresql96 packages.
New packages are available:
  SUSE LE 12 SP1: postgresql96 9.6.17-3.33.1
  SUSE LE 12 SP2: postgresql96 9.6.17-3.33.1
  SUSE LE 12 SP3: postgresql96 9.6.17-3.33.1

SUSE LE 15: new postgresql10 packages.
New packages are available:
  SUSE LE 15 RTM: postgresql10 10.12-4.19.1

SUSE LE 15 SP1: new postgresql10 packages.
New packages are available:
  SUSE LE 15 SP1: postgresql10 10.12-8.9.1

Ubuntu: new postgresql packages.
New packages are available:
  Ubuntu 19.10: postgresql-11 11.7-0ubuntu0.19.10.1
  Ubuntu 18.04 LTS: postgresql-10 10.12-0ubuntu0.18.04.1

Wind River Linux: version 10.18.44.16.
The version 10.18.44.16 is fixed:
  https://support2.windriver.com/
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