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Vulnerability of systemd: privilege escalation via chown_one

Synthesis of the vulnerability 

An attacker can bypass restrictions via chown_one() of systemd, in order to escalate his privileges.
Vulnerable products: Ubuntu.
Severity of this weakness: 2/4.
Creation date: 13/11/2018.
Références of this bulletin: CVE-2018-15687, USN-3816-1, USN-3816-2, USN-3816-3, VIGILANCE-VUL-27762.

Description of the vulnerability 

An attacker can bypass restrictions via chown_one() of systemd, in order to escalate his privileges.
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This threat alert impacts software or systems such as Ubuntu.

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

Solutions for this threat 

Ubuntu: new systemd packages.
New packages are available:
  Ubuntu 18.10: systemd 239-7ubuntu10.4
  Ubuntu 18.04 LTS: systemd 237-3ubuntu10.9
  Ubuntu 16.04 LTS: systemd 229-4ubuntu21.10
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