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Vulnerability of Xen: information disclosure via Power Interfaces Weak Access

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via Power Interfaces Weak Access of Xen, in order to obtain sensitive information on the host system.
Vulnerable systems: Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this threat: 1/4.
Creation date: 11/11/2020.
Références of this weakness: CERTFR-2020-AVI-728, CERTFR-2020-AVI-794, CERTFR-2020-AVI-811, CVE-2020-28368, DSA-4804-1, FEDORA-2020-d71fa5f0b9, openSUSE-SU-2020:2017-1, openSUSE-SU-2020:2030-1, openSUSE-SU-2020:2162-1, openSUSE-SU-2020:2192-1, SUSE-SU-2020:14557-1, SUSE-SU-2020:3412-1, SUSE-SU-2020:3413-1, SUSE-SU-2020:3414-1, SUSE-SU-2020:3415-1, SUSE-SU-2020:3416-1, SUSE-SU-2020:3611-1, SUSE-SU-2020:3612-1, SUSE-SU-2020:3615-1, SUSE-SU-2020:3627-1, SUSE-SU-2020:3631-1, SUSE-SU-2020:3653-1, SUSE-SU-2020:3713-1, SUSE-SU-2020:3742-1, VIGILANCE-VUL-33884, XSA-351.

Description of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via Power Interfaces Weak Access of Xen, in order to obtain sensitive information on the host system.
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This vulnerability bulletin impacts software or systems such as Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this security note is low.

The trust level is of type confirmed by the editor, with an origin of privileged shell.

An attacker with a expert ability can exploit this cybersecurity note.

Solutions for this threat 

Xen: patch for Power Sidechannel.
A patch is available:
  http://xenbits.xen.org/xsa/xsa351-arm.patch
  http://xenbits.xen.org/xsa/xsa351-arm-4.11.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.11-1.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.11-2.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.12-1.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.12-2.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.13-1.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.13-2.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.14-1.patch
  http://xenbits.xen.org/xsa/xsa351-x86-4.14-2.patch

Debian 10: new xen packages.
New packages are available:
  Debian 10: xen 4.11.4+57-g41a822c392-1

Fedora 33: new xen packages.
New packages are available:
  Fedora 33: xen 4.14.0-12.fc33

openSUSE Leap 15.1: new xen packages (08/12/2020).
New packages are available:
  openSUSE Leap 15.1: xen 4.12.4_04-lp151.2.33.1

openSUSE Leap 15.1: new xen packages (27/11/2020).
New packages are available:
  openSUSE Leap 15.1: xen 4.12.4_02-lp151.2.30.1

openSUSE Leap 15.2: new xen packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.2: xen 4.13.2_04-lp152.2.18.1

openSUSE Leap 15.2: new xen packages (26/11/2020).
New packages are available:
  openSUSE Leap 15.2: xen 4.13.2_02-lp152.2.15.1

SUSE LE 11 SP4: new xen packages.
New packages are available:
  SUSE LE 11 SP4: xen 4.4.4_46-61.58.1

SUSE LE 12 SP2: new xen packages.
New packages are available:
  SUSE LE 12 SP2: xen 4.7.6_12-43.70.1

SUSE LE 12 SP3: new xen packages.
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_14-3.77.1

SUSE LE 12 SP4: new xen packages (08/12/2020).
New packages are available:
  SUSE LE 12 SP4: xen 4.11.4_14-2.45.1

SUSE LE 12 SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP5: xen 4.12.4_04-3.33.1

SUSE LE 15 RTM: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_22-3.50.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 SP1: xen 4.12.4_04-3.37.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.29.1

SUSE LE 15 SP2: new xen packages.
New packages are available:
  SUSE LE 15 SP2: xen 4.13.2_04-3.19.1

SUSE LE: new xen packages.
New packages are available:
  SUSE LE 12 SP4: xen 4.11.4_12-2.42.1
  SUSE LE 12 SP5: xen 4.12.4_02-3.30.1
  SUSE LE 15 RTM: xen 4.10.4_20-3.47.1
  SUSE LE 15 SP1: xen 4.12.4_02-3.34.2
  SUSE LE 15 SP2: xen 4.13.2_02-3.16.2
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