USN-1654-1: CUPS vulnerability

Ubuntu Security Notice USN-1654-1

5th December, 2012

cups, cupsys vulnerability

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


CUPS could be made to read files or run programs as an administrator.

Software description

  • cups - Common UNIX Printing System(tm)
  • cupsys - Common UNIX Printing System(tm)


It was discovered that users in the lpadmin group could modify certain CUPS
configuration options to escalate privileges. An attacker could use this to
potentially gain root privileges.

Update instructions

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

Ubuntu 12.10:
cups 1.6.1-0ubuntu11.3
Ubuntu 12.04 LTS:
cups 1.5.3-0ubuntu5.1
Ubuntu 11.10:
cups 1.5.0-8ubuntu7.3
Ubuntu 10.04 LTS:
cups 1.4.3-1ubuntu1.9
Ubuntu 8.04 LTS:
cupsys 1.3.7-1ubuntu3.16

To update your system, please follow these instructions:

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

This update adds the new cups-files.conf configuration file for privileged
CUPS settings. In certain customized environments, these settings may need
to be manually moved to this new file. For more information, please see the
updated documentation installed with this package and inspect the CUPS
error log.