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Vulnerability of GnuTLS: information disclosure via DTLS No Client Randomness

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via DTLS No Client Randomness of GnuTLS, in order to obtain sensitive information.
Vulnerable systems: Debian, Fedora, openSUSE Leap, RHEL, Slackware, Ubuntu.
Severity of this threat: 2/4.
Creation date: 01/04/2020.
Références of this weakness: CVE-2020-11501, DSA-4652-1, FEDORA-2020-d14280a6e8, FEDORA-2020-f90fb78f70, GNUTLS-SA-2020-03-31, openSUSE-SU-2020:0501-1, RHSA-2020:1998-01, SSA:2020-091-01, USN-4322-1, VIGILANCE-VUL-31916.

Description of the vulnerability 

An attacker can bypass access restrictions to data via DTLS No Client Randomness of GnuTLS, in order to obtain sensitive information.
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This weakness impacts software or systems such as Debian, Fedora, openSUSE Leap, RHEL, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability announce 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 threat bulletin.

Solutions for this threat 

Debian 10: new gnutls28 packages.
New packages are available:
  Debian 10: gnutls28 3.6.7-4+deb10u3

Fedora 31, 32: new mingw-gnutls packages.
New packages are available:
  Fedora 31: mingw-gnutls 3.6.13-1.fc31
  Fedora 32: mingw-gnutls 3.6.13-1.fc32

openSUSE Leap 15.1: new gnutls packages.
New packages are available:
  openSUSE Leap 15.1: gmp 6.1.2-lp151.4.3.1, gnutls 3.6.7-lp151.2.6.1, nettle 3.4.1-lp151.2.3.2

RHEL 8.2: new gnutls packages.
New packages are available:
  RHEL 8.2: gnutls 3.6.8-10.el8_2

Slackware: new gnutls packages.
New packages are available:
  Slackware 14.2: gnutls 3.6.13-*-1_slack14.2

Ubuntu 19.10: new libgnutls30 packages.
New packages are available:
  Ubuntu 19.10: libgnutls30 3.6.9-5ubuntu1.1

Wind River Linux: version 10.19.45.9.
The version 10.19.45.9 is fixed:
  https://support.windriver.com/
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