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Vulnerability of polkit: denial of service via authentication_agent_new

Synthesis of the vulnerability 

An attacker can generate a fatal error in authentication_agent_new of polkit, in order to trigger a denial of service.
Impacted products: Fedora, openSUSE, openSUSE Leap, Ubuntu.
Severity of this bulletin: 1/4.
Creation date: 15/07/2015.
Références of this threat: CVE-2015-3218, FEDORA-2015-11058, FEDORA-2015-11743, openSUSE-SU-2015:1734-1, openSUSE-SU-2015:1927-1, USN-3717-1, USN-3717-2, VIGILANCE-VUL-17385.

Description of the vulnerability 

An attacker can generate a fatal error in authentication_agent_new of polkit, in order to trigger a denial of service.
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This computer threat announce impacts software or systems such as Fedora, openSUSE, openSUSE Leap, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability is low.

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 alert.

Solutions for this threat 

Fedora: new polkit packages.
New packages are available:
  Fedora 21: polkit 0.113-4.fc21
  Fedora 22: polkit 0.113-1.fc22

openSUSE: new polkit packages.
New packages are available:
  openSUSE 13.1: polkit 0.113-9.1
  openSUSE 13.2: polkit 0.113-3.8.1
  openSUSE Leap 42.1: polkit 0.113-6.1

Ubuntu: new libpolkit-backend-1-0 packages.
New packages are available:
  Ubuntu 18.04 LTS: libpolkit-backend-1-0 0.105-20ubuntu0.18.04.1
  Ubuntu 17.10: libpolkit-backend-1-0 0.105-18ubuntu0.1
  Ubuntu 16.04 LTS: libpolkit-backend-1-0 0.105-14.1ubuntu0.1
  Ubuntu 14.04 LTS: libpolkit-backend-1-0 0.105-4ubuntu3.14.04.2
  Ubuntu 12.04 ESM: libpolkit-backend-1-0 0.104-1ubuntu1.2
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