[SECURITY] [DLA 614-1] xen security update

2016-09-09T08:29:41
ID DEBIAN:DLA-614-1:88EDF
Type debian
Reporter Debian
Modified 2016-09-09T08:29:41

Description

Package : xen Version : 4.1.6.lts1-2 CVE ID : CVE-2016-7092 CVE-2016-7094

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:

CVE-2016-7092 (XSA-185)

Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba
discovered a flaw in the handling of L3 pagetable entries, allowing
a malicious 32-bit PV guest administrator can escalate their
privilege to that of the host.

CVE-2016-7094 (XSA-187)

x86 HVM guests running with shadow paging use a subset of the x86
emulator to handle the guest writing to its own pagetables. Andrew
Cooper of Citrix discovered that there are situations a guest can
provoke which result in exceeding the space allocated for internal
state. A malicious HVM guest administrator can cause Xen to fail a
bug check, causing a denial of service to the host.

For Debian 7 "Wheezy", these problems have been fixed in version 4.1.6.lts1-2. For Debian 8 "Jessie", these problems have been fixed in version 4.4.1-9+deb8u7.

We recommend that you upgrade your xen packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS