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Vulnerability of Thunderbird: information disclosure via STARTTLS IMAP PREAUTH unencrypted

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via STARTTLS IMAP PREAUTH unencrypted of Thunderbird, in order to obtain sensitive information.
Vulnerable systems: Debian, Fedora, Thunderbird, openSUSE Leap, Solaris, RHEL, Slackware, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 04/06/2020.
Références of this weakness: CERTFR-2020-AVI-344, CVE-2020-12398, DLA-2247-1, DSA-4702-1, FEDORA-2020-19e5635ee3, FEDORA-2020-5f7f8fcbce, MFSA2020-22, openSUSE-SU-2020:0799-1, RHSA-2020:2611-01, RHSA-2020:2613-01, RHSA-2020:2614-01, RHSA-2020:2615-01, RHSA-2020:2616-01, SSA:2020-156-01, SUSE-SU-2020:1591-2, USN-4421-1, VIGILANCE-VUL-32444.

Description of the vulnerability 

An attacker can bypass access restrictions to data via STARTTLS IMAP PREAUTH unencrypted of Thunderbird, in order to obtain sensitive information.
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This weakness impacts software or systems such as Debian, Fedora, Thunderbird, openSUSE Leap, Solaris, RHEL, Slackware, SLES, 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 LAN.

An attacker with a expert ability can exploit this threat bulletin.

Solutions for this threat 

Thunderbird: version 68.9.0.
The version 68.9.0 is fixed:
  https://www.mozilla.org/

Debian 8: new thunderbird packages.
New packages are available:
  Debian 8: thunderbird 1:68.9.0-1~deb8u2

Debian 9-10: new thunderbird packages.
New packages are available:
  Debian 9: thunderbird 1:68.9.0-1~deb9u1
  Debian 10: thunderbird 1:68.9.0-1~deb10u1

Fedora 31: new thunderbird packages.
New packages are available:
  Fedora 31: thunderbird 68.9.0-1.fc31

Fedora 32: new thunderbird packages.
New packages are available:
  Fedora 32: thunderbird 68.9.0-1.fc32

openSUSE Leap 15.1: new MozillaThunderbird packages.
New packages are available:
  openSUSE Leap 15.1: MozillaThunderbird 68.9.0-lp151.2.41.1

Oracle Solaris: patch for third party software of July 2020 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 6.10: new thunderbird packages.
New packages are available:
  RHEL 6.10: thunderbird 68.9.0-1.el6_10

RHEL 7.8: new thunderbird packages.
New packages are available:
  RHEL 7.8: thunderbird 68.9.0-1.el7_8

RHEL 8: new thunderbird packages.
New packages are available:
  RHEL 8.0: thunderbird 68.9.0-1.el8_0
  RHEL 8.1: thunderbird 68.9.0-1.el8_1
  RHEL 8.2: thunderbird 68.9.0-1.el8_2

Slackware: new mozilla-thunderbird packages.
New packages are available:
  Slackware 14.2: mozilla-thunderbird 68.9.0-*-1_slack14.2

SUSE LE 15 SP2: new MozillaThunderbird packages.
New packages are available:
  SUSE LE 15 SP2: MozillaThunderbird 68.9.0-3.85.2

Ubuntu: new thunderbird packages.
New packages are available:
  Ubuntu 20.04 LTS: thunderbird 1:68.10.0+build1-0ubuntu0.20.04.1
  Ubuntu 19.10: thunderbird 1:68.10.0+build1-0ubuntu0.19.10.1
  Ubuntu 18.04 LTS: thunderbird 1:68.10.0+build1-0ubuntu0.18.04.1
  Ubuntu 16.04 LTS: thunderbird 1:68.10.0+build1-0ubuntu0.16.04.1
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