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Vulnerability of OTRS Help Desk: privilege escalation via Session ID Link Sharing

Synthesis of the vulnerability 

An attacker can bypass restrictions via Session ID Link Sharing of OTRS Help Desk, in order to escalate his privileges.
Impacted software: Debian, openSUSE Leap, OTRS Help Desk, SLES.
Severity of this computer vulnerability: 2/4.
Creation date: 12/07/2019.
Références of this announce: CVE-2019-12746, DLA-1877-1, openSUSE-SU-2020:0551-1, OSA-2019-10, VIGILANCE-VUL-29758.

Description of the vulnerability 

An attacker can bypass restrictions via Session ID Link Sharing of OTRS Help Desk, in order to escalate his privileges.
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This computer weakness impacts software or systems such as Debian, openSUSE Leap, OTRS Help Desk, SLES.

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

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

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

Solutions for this threat 

OTRS Help Desk: version 6.0.20.
The version 6.0.20 is fixed:
  https://community.otrs.com/download-otrs-community-edition/

OTRS Help Desk: version 5.0.37.
The version 5.0.37 is fixed:
  https://community.otrs.com/download-otrs-community-edition/

Debian 8: new otrs2 packages.
New packages are available:
  Debian 8: otrs2 3.3.18-1+deb8u11

openSUSE Leap 15.1: new otrs packages.
New packages are available:
  openSUSE Leap 15.1: otrs 5.0.42-lp151.2.3.1

SUSE LE 15: new otrs packages.
New packages are available:
  SUSE LE 15 SP1: otrs 5.0.42-bp151.3.3.1
  SUSE LE 15 RTM: otrs 5.0.42-bp150.2.10.1
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