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Vulnerability of libbsd: out-of-bounds memory reading via nlist.c

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via nlist.c of libbsd, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable systems: Debian, openSUSE Leap, Ubuntu.
Severity of this threat: 2/4.
Creation date: 21/01/2020.
Références of this weakness: CVE-2019-20367, DLA-2566-1, openSUSE-SU-2020:0679-1, USN-4243-1, VIGILANCE-VUL-31376.

Description of the vulnerability 

An attacker can force a read at an invalid address via nlist.c of libbsd, in order to trigger a denial of service, or to obtain sensitive information.
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This vulnerability bulletin impacts software or systems such as Debian, openSUSE Leap, Ubuntu.

Our Vigil@nce team determined that the severity of this security note is medium.

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

An attacker with a expert ability can exploit this cybersecurity note.

Solutions for this threat 

Debian 9: new libbsd packages.
New packages are available:
  Debian 9: libbsd 0.8.3-1+deb9u1

openSUSE Leap 15.1: new libbsd packages.
New packages are available:
  openSUSE Leap 15.1: libbsd 0.8.7-lp151.3.3.1

Ubuntu: new libbsd packages.
New packages are available:
  Ubuntu 19.04: libbsd0 0.9.1-2ubuntu0.1
  Ubuntu 18.04 LTS: libbsd0 0.8.7-1ubuntu0.1
  Ubuntu 16.04 LTS: libbsd0 0.8.2-1ubuntu0.1
  Ubuntu 14.04 ESM: libbsd0 0.6.0-2ubuntu1+esm1
  Ubuntu 12.04 ESM: libbsd0 0.3.0-2ubuntu0.1

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/
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