[SECURITY] [DLA 964-1] xen security update

ID DEBIAN:DLA-964-1:19E02
Type debian
Reporter Debian
Modified 2017-06-01T09:15:38


Package : xen Version : 4.1.6.lts1-8 CVE ID : CVE-2016-9932 CVE-2017-7995 CVE-2017-8903 CVE-2017-8904 CVE-2017-8905

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

CVE-2016-9932 (XSA-200)

CMPXCHG8B emulation allows local HVM guest OS users to obtain sensitive
information from host stack memory.


Xen checks access permissions to MMIO ranges only after accessing them,
allowing host PCI device space memory reads.

CVE-2017-8903 (XSA-213)

Xen mishandles page tables after an IRET hypercall which can lead to
arbitrary code execution on the host OS. The vulnerability is only exposed
to 64-bit PV guests.

CVE-2017-8904 (XSA-214)

Xen mishandles the "contains segment descriptors" property during
GNTTABOP_transfer. This might allow PV guest OS users to execute arbitrary
code on the host OS.

CVE-2017-8905 (XSA-215)

Xen mishandles a failsafe callback which might allow PV guest OS users to
execute arbitrary code on the host OS.

For Debian 7 "Wheezy", these problems have been fixed in version 4.1.6.lts1-8.

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