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Vulnerability of CUPS: privilege escalation via AppArmor Dnssd

Synthesis of the vulnerability 

An attacker can bypass restrictions via AppArmor Dnssd of CUPS, in order to escalate his privileges.
Impacted products: CUPS, Debian, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 12/07/2018.
Références of this threat: CVE-2018-6553, DLA-1426-1, DSA-4243-1, USN-3713-1, VIGILANCE-VUL-26697.

Description of the vulnerability 

An attacker can bypass restrictions via AppArmor Dnssd of CUPS, in order to escalate his privileges.
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This computer weakness note impacts software or systems such as CUPS, Debian, Ubuntu.

Our Vigil@nce team determined that the severity of this security 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 announce.

Solutions for this threat 

CUPS: version 2.2.8.
The version 2.2.8 is fixed:
  https://github.com/apple/cups/releases/tag/v2.2.8

CUPS: patch.
A patch is indicated in information sources.

Debian 8: new cups packages.
New packages are available:
  Debian 8: cups 1.7.5-11+deb8u4

Debian 9: new cups packages.
New packages are available:
  Debian 9: cups 2.2.1-8+deb9u2

Ubuntu: new cups packages.
New packages are available:
  Ubuntu 18.04 LTS: cups 2.2.7-1ubuntu2.1
  Ubuntu 17.10: cups 2.2.4-7ubuntu3.1
  Ubuntu 16.04 LTS: cups 2.1.3-4ubuntu0.5
  Ubuntu 14.04 LTS: cups 1.7.2-0ubuntu1.10
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