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Vulnerability of Xen: information disclosure via handle_xyz_io

Synthesis of the vulnerability 

A local attacker can read a memory fragment via the handle_xyz_io functions of Xen, in order to obtain sensitive information.
Vulnerable products: XenServer, Debian, openSUSE, SUSE Linux Enterprise Desktop, SLES, Unix (platform) ~ not comprehensive.
Severity of this weakness: 1/4.
Creation date: 05/03/2015.
Références of this bulletin: CERTFR-2015-AVI-110, CTX200484, CVE-2015-2044, DSA-3181-1, openSUSE-SU-2015:0732-1, openSUSE-SU-2015:1092-1, openSUSE-SU-2015:1094-1, SUSE-SU-2015:0613-1, VIGILANCE-VUL-16320, XSA-121.

Description of the vulnerability 

The Xen product emulates elements of an x86 system.

However, the handle_pit_io(), handle_pmt_io() and handle_rtc_io()XYZ functions do not initialize a memory area before returning it to the user.

A local attacker can therefore read a memory fragment via the handle_xyz_io functions of Xen, in order to obtain sensitive information.
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This cybersecurity weakness impacts software or systems such as XenServer, Debian, openSUSE, SUSE Linux Enterprise Desktop, SLES, Unix (platform) ~ not comprehensive.

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

Solutions for this threat 

Xen: patch for handle_xyz_io.
A patch is available in information sources.

Citrix XenServer: patch.
A patch is available in information sources.

Debian: new xen packages.
New packages are available:
  Debian 7: xen 4.1.4-3+deb7u5

openSUSE 13.1: new xen packages.
New packages are available:
  openSUSE 13.1: xen 4.3.4_02-41.1

openSUSE 13: new xen packages.
New packages are available:
  openSUSE 13.2: xen 4.4.2_06-23.1
  openSUSE 13.1: xen 4.3.4_05-47.1

SUSE LE 12: new xen packages.
New packages are available:
  SUSE LE 12: xen 4.4.1_10-9.1
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