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Vulnerability of Xen: privilege escalation via Stale P2M Mappings

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Stale P2M Mappings of Xen, in order to escalate his privileges on the host system.
Impacted systems: XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this alert: 2/4.
Creation date: 20/06/2017.
Références of this alert: CERTFR-2017-AVI-190, CERTFR-2017-AVI-195, CTX224740, CVE-2017-10918, DLA-1132-1, DSA-3969-1, FEDORA-2017-b3bdaf58bc, FEDORA-2017-c3149b5fcb, openSUSE-SU-2017:1826-1, SUSE-SU-2017:1795-1, SUSE-SU-2017:1812-1, VIGILANCE-VUL-23033, XSA-222.

Description of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Stale P2M Mappings of Xen, in order to escalate his privileges on the host system.
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This security weakness impacts software or systems such as XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this threat bulletin is medium.

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 threat.

Solutions for this threat 

Xen: patch for Stale P2M Mappings.
A patch is available:
  http://xenbits.xen.org/xsa/xsa222-1.patch
  http://xenbits.xen.org/xsa/xsa222-1-4.6.patch
  http://xenbits.xen.org/xsa/xsa222-1-4.7.patch
  http://xenbits.xen.org/xsa/xsa222-2.patch
  http://xenbits.xen.org/xsa/xsa222-2-4.5.patch
  http://xenbits.xen.org/xsa/xsa222-2-4.6.patch
  http://xenbits.xen.org/xsa/xsa222-2-4.7.patch
  http://xenbits.xen.org/xsa/xsa222-2-4.8.patch

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

Debian 7: new xen packages.
New packages are available:
  Debian 7: xen 4.1.6.lts1-9

Debian 8/9: new xen packages.
New packages are available:
  Debian 8: xen 4.4.1-9+deb8u10
  Debian 9: xen 4.8.1-1+deb9u3

Fedora: new xen packages.
New packages are available:
  Fedora 24: xen 4.6.5-7.fc24
  Fedora 25: xen 4.7.2-7.fc25

openSUSE Leap 42.2: new xen packages.
New packages are available:
  openSUSE Leap 42.2: xen 4.7.2_06-11.9.1

SUSE LE 12: new xen packages (06/07/2017).
New packages are available:
  SUSE LE 12 RTM: xen 4.4.4_21-22.42.1

SUSE LE 12 SP1: new xen packages.
New packages are available:
  SUSE LE 12 SP1: xen 4.5.5_12-22.18.1
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