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Vulnerability of Mutt: disabling TLS

Synthesis of the vulnerability 

An attacker can force Mutt to no use TLS with an IMAP server.
Vulnerable products: Debian, openSUSE Leap, Solaris, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 25/11/2020.
Références of this bulletin: CVE-2020-28896, DLA-2472-1, openSUSE-SU-2020:2127-1, openSUSE-SU-2020:2128-1, openSUSE-SU-2020:2141-1, openSUSE-SU-2020:2157-1, openSUSE-SU-2020:2158-1, SSA:2020-329-01, SUSE-SU-2020:14551-1, SUSE-SU-2020:3568-1, SUSE-SU-2020:3632-1, USN-4645-1, VIGILANCE-VUL-33972.

Description of the vulnerability 

An attacker can force Mutt to no use TLS with an IMAP server.
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This vulnerability bulletin impacts software or systems such as Debian, openSUSE Leap, Solaris, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

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

Solutions for this threat 

Debian 9: new mutt packages.
New packages are available:
  Debian 9: mutt 1.7.2-1+deb9u4

openSUSE Leap 15.1: new mutt packages.
New packages are available:
  openSUSE Leap 15.1: mutt 1.10.1-lp151.2.6.1

openSUSE Leap 15.2: new mutt packages.
New packages are available:
  openSUSE Leap 15.2: mutt 1.10.1-lp152.3.6.1

openSUSE Leap 15: new neomutt packages.
New packages are available:
  openSUSE Leap 15.1: neomutt 20201120-lp151.2.3.1
  openSUSE Leap 15.2: neomutt 20201120-lp152.2.3.1

Oracle Solaris: patch for third party software of January 2021 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Slackware: new mutt packages.
New packages are available:
  Slackware 14.0: mutt 1.10.1-*-2_slack14.0
  Slackware 14.1: mutt 1.10.1-*-2_slack14.1
  Slackware 14.2: mutt 1.10.1-*-2_slack14.2

SUSE LE 11 SP3-4: new mutt packages.
New packages are available:
  SUSE LE 11 SP3: mutt 1.5.17-42.56.1
  SUSE LE 11 SP4: mutt 1.5.17-42.56.1

SUSE LE 12 SP2-5: new mutt packages.
New packages are available:
  SUSE LE 12 SP2: mutt 1.10.1-55.18.1
  SUSE LE 12 SP3: mutt 1.10.1-55.18.1
  SUSE LE 12 SP4: mutt 1.10.1-55.18.1
  SUSE LE 12 SP5: mutt 1.10.1-55.18.1

SUSE LE 15 RTM-SP3: new mutt packages.
New packages are available:
  SUSE LE 15 RTM: mutt 1.10.1-3.11.1
  SUSE LE 15 SP1: mutt 1.10.1-3.11.1
  SUSE LE 15 SP2: mutt 1.10.1-3.11.1
  SUSE LE 15 SP3: mutt 1.10.1-3.11.1

SUSE LE 15 SP1: new neomutt packages.
New packages are available:
  SUSE LE 15 SP1: neomutt 20201120-bp151.3.3.1

SUSE LE 15 SP2: new neomutt packages.
New packages are available:
  SUSE LE 15 SP2: neomutt 20201120-bp152.2.3.1

Ubuntu: new mutt packages.
New packages are available:
  Ubuntu 20.10: mutt 1.14.6-1ubuntu0.1
  Ubuntu 20.04 LTS: mutt 1.13.2-1ubuntu0.3
  Ubuntu 18.04 LTS: mutt 1.9.4-3ubuntu0.4
  Ubuntu 16.04 LTS: mutt 1.5.24-1ubuntu0.5
  Ubuntu 12.04 ESM: mutt 1.5.21-5ubuntu2.6
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