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Vulnerability of Unbound: denial of service via PID File Symlink

Synthesis of the vulnerability 

An attacker can trigger a fatal error via PID File Symlink of Unbound, in order to trigger a denial of service.
Impacted software: Debian, openSUSE Leap, SLES.
Severity of this computer vulnerability: 1/4.
Creation date: 03/12/2020.
Références of this announce: CVE-2020-28935, DLA-2556-1, openSUSE-SU-2020:2222-1, VIGILANCE-VUL-34030.

Description of the vulnerability 

An attacker can trigger a fatal error via PID File Symlink of Unbound, in order to trigger a denial of service.
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This security alert impacts software or systems such as Debian, openSUSE Leap, SLES.

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

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

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

Solutions for this threat 

Unbound: version 1.13.0.
The version 1.13.0 is fixed:
  https://www.nlnetlabs.nl/projects/unbound/download/#unbound-1-13-0

Unbound: patch for PID File Symlink.
A patch is available:
  https://www.nlnetlabs.nl/downloads/unbound/patch_cve-2020-28935_unbound.diff

Debian 9: new unbound1.9 packages.
New packages are available:
  Debian 9: unbound1.9 1.9.0-2+deb10u2~deb9u1

openSUSE Leap, SUSE LE: new nsd packages.
New packages are available:
  openSUSE Leap 15.1: nsd 4.1.27-lp151.2.3.1
  openSUSE Leap 15.2: nsd 4.3.4-lp152.2.3.1
  SUSE LE 15 SP1: nsd 4.1.27-bp151.3.3.1
  SUSE LE 15 SP2: nsd 4.3.4-bp152.2.3.1
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