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Vulnerability of Mailman: vulnerability via List Name Content Spoofing

Synthesis of the vulnerability 

A vulnerability via List Name Content Spoofing of Mailman was announced.
Vulnerable systems: Debian, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 25/07/2018.
Références of this weakness: CVE-2018-13796, DLA-1442-1, DLA-1442-2, openSUSE-SU-2018:2309-1, RHSA-2020:1054-01, SUSE-SU-2018:4296-1, SUSE-SU-2019:13924-1, USN-4348-1, VIGILANCE-VUL-26828.

Description of the vulnerability 

A vulnerability via List Name Content Spoofing of Mailman was announced.
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This computer threat impacts software or systems such as Debian, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability alert 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 weakness.

Solutions for this threat 

Debian 8: new mailman packages.
New packages are available:
  Debian 8: mailman 1:2.1.18-2+deb8u4

openSUSE Leap: new mailman packages.
New packages are available:
  openSUSE Leap 42.3: mailman 2.1.29-2.11.2

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 7: new mailman packages.
New packages are available:
  RHEL 7.0-7.7: mailman 2.1.15-30.el7

SUSE LE 11 SP3/4: new mailman packages.
New packages are available:
  SUSE LE 11 SP3: mailman 2.1.15-9.6.6.1
  SUSE LE 11 SP4: mailman 2.1.15-9.6.6.1

SUSE LE 12: new mailman packages.
New packages are available:
  SUSE LE 12 RTM: mailman 2.1.17-3.3.3
  SUSE LE 12 SP1: mailman 2.1.17-3.3.3
  SUSE LE 12 SP2: mailman 2.1.17-3.3.3
  SUSE LE 12 SP3: mailman 2.1.17-3.3.3
  SUSE LE 12 SP4: mailman 2.1.17-3.3.3

Ubuntu: new mailman packages.
New packages are available:
  Ubuntu 18.04 LTS: mailman 1:2.1.26-1ubuntu0.1
  Ubuntu 16.04 LTS: mailman 1:2.1.20-1ubuntu0.4
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