[USN-3607-1] Screen Resolution Extra vulnerability

[Chris Coulson]

==========================================================================
Ubuntu Security Notice USN-3607-1
March 26, 2018

screen-resolution-extra vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Screen Resolution Extra could be tricked into bypassing PolicyKit
authorizations.

Software Description:
- screen-resolution-extra: Extension for the GNOME screen resolution applet

Details:

It was discovered that Screen Resolution Extra was using PolicyKit in an
unsafe manner. A local attacker could potentially exploit this issue to
bypass intended PolicyKit authorizations.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.10:
  screen-resolution-extra         0.17.1.1

Ubuntu 16.04 LTS:
  screen-resolution-extra         0.17.1.1~16.04.1

Ubuntu 14.04 LTS:
  screen-resolution-extra         0.17.1.1~14.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3607-1
  CVE-2018-8885

Package Information:
  https://launchpad.net/ubuntu/+source/screen-resolution-extra/0.17.1.1
  https://launchpad.net/ubuntu/+source/screen-resolution-extra/0.17.1.1~16.04.1
  https://launchpad.net/ubuntu/+source/screen-resolution-extra/0.17.1.1~14.04.1


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