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Vulnerability of CUPS: privilege escalation via CUPS_SERVERBIN

Synthesis of the vulnerability 

An attacker can bypass restrictions via CUPS_SERVERBIN of CUPS, in order to escalate his privileges.
Impacted systems: CUPS, Debian, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 2/4.
Creation date: 12/07/2018.
Références of this alert: CVE-2018-4180, DLA-1426-1, DSA-4243-1, openSUSE-SU-2018:2239-1, openSUSE-SU-2018:2292-1, RHSA-2020:1050-01, SUSE-SU-2018:2162-1, SUSE-SU-2018:2172-1, SUSE-SU-2018:2233-1, USN-3713-1, VIGILANCE-VUL-26693.

Description of the vulnerability 

An attacker can bypass restrictions via CUPS_SERVERBIN of CUPS, in order to escalate his privileges.
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This threat impacts software or systems such as CUPS, Debian, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat 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 cybersecurity bulletin.

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

openSUSE Leap 15.0: new cups packages.
New packages are available:
  openSUSE Leap 15.0: cups 2.2.7-lp150.2.3.1

openSUSE Leap 42.3: new cups packages.
New packages are available:
  openSUSE Leap 42.3: cups 1.7.5-12.6.1

RHEL 7: new cups packages.
New packages are available:
  RHEL 7.0-7.7: cups 1.6.3-43.el7

SUSE LE 11 SP4: new cups packages.
New packages are available:
  SUSE LE 11 SP4: cups 1.3.9-8.46.56.3.1

SUSE LE 12 SP3: new cups packages.
New packages are available:
  SUSE LE 12 SP3: cups 1.7.5-20.14.1

SUSE LE 15: new cups packages.
New packages are available:
  SUSE LE 15 RTM: cups 2.2.7-3.3.1

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

Wind River Linux: solution (16/10/2018).
The solution is indicated in information sources.
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