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Vulnerability of snapd: privilege escalation via XDG_DATA_DIRS

Synthesis of the vulnerability 

An attacker can bypass restrictions via XDG_DATA_DIRS of snapd, in order to escalate his privileges.
Vulnerable software: Fedora, Ubuntu.
Severity of this announce: 2/4.
Creation date: 16/07/2020.
Références of this computer vulnerability: CVE-2020-11934, FEDORA-2020-7685deba9b, FEDORA-2020-ccb155ea2c, USN-4424-1, VIGILANCE-VUL-32845.

Description of the vulnerability 

An attacker can bypass restrictions via XDG_DATA_DIRS of snapd, in order to escalate his privileges.
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This security weakness impacts software or systems such as Fedora, Ubuntu.

Our Vigil@nce team determined that the severity of this threat bulletin is medium.

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

An attacker with a expert ability can exploit this threat.

Solutions for this threat 

Fedora 31-32: new snapd packages.
New packages are available:
  Fedora 31: snapd 2.45.2-1.fc31
  Fedora 32: snapd 2.45.2-1.fc32

Ubuntu: new snapd packages.
New packages are available:
  Ubuntu 20.04 LTS: snapd 2.45.1+20.04.2
  Ubuntu 19.10: snapd 2.45.1+19.10.2
  Ubuntu 18.04 LTS: snapd 2.45.1+18.04.2
  Ubuntu 16.04 LTS: snapd 2.45.1ubuntu0.2
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