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Vulnerability of Apport: privilege escalation via Lock File Symlink

Synthesis of the vulnerability 

An attacker can bypass restrictions via Lock File Symlink of Apport, in order to escalate his privileges.
Impacted systems: Ubuntu.
Severity of this alert: 2/4.
Creation date: 02/04/2020.
Références of this alert: CVE-2020-8831, USN-4315-1, USN-4315-2, VIGILANCE-VUL-31925.

Description of the vulnerability 

An attacker can bypass restrictions via Lock File Symlink of Apport, in order to escalate his privileges.
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This computer threat note impacts software or systems such as Ubuntu.

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

Solutions for this threat 

Ubuntu: new apport packages.
New packages are available:
  Ubuntu 19.10: apport 2.20.11-0ubuntu8.8
  Ubuntu 18.04 LTS: apport 2.20.9-0ubuntu7.14
  Ubuntu 16.04 LTS: apport 2.20.1-0ubuntu2.23
  Ubuntu 14.04 ESM: apport 2.14.1-0ubuntu3.29+esm4
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