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Vulnerability of SDDM: privilege escalation via X Server Connection

Synthesis of the vulnerability 

An attacker can bypass restrictions via X Server Connection of SDDM, in order to escalate his privileges.
Vulnerable software: Debian, openSUSE Leap, SLES.
Severity of this announce: 2/4.
Creation date: 05/11/2020.
Références of this computer vulnerability: CVE-2020-28049, DLA-2436-1, DSA-4783-1, openSUSE-SU-2020:1870-1, VIGILANCE-VUL-33835.

Description of the vulnerability 

An attacker can bypass restrictions via X Server Connection of SDDM, in order to...
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This security vulnerability impacts software or systems such as Debian, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer weakness bulletin 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 security note.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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