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[SECURITY] [DLA 571-1] xen security update



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Package        : xen
Version        : 4.1.6.lts1-1
CVE ID         : CVE-2014-3672 CVE-2016-3158 CVE-2016-3159 CVE-2016-3710 
                 CVE-2016-3712 CVE-2016-3960 CVE-2016-4480 CVE-2016-6258
Debian Bug     : 

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

CVE-2014-3672 (XSA-180)

    Andrew Sorensen discovered that a HVM domain can exhaust the hosts
    disk space by filling up the log file.

CVE-2016-3158, CVE-2016-3159 (XSA-172)

    Jan Beulich from SUSE discovered that Xen does not properly handle
    writes to the hardware FSW.ES bit when running on AMD64 processors.
    A malicious domain can take advantage of this flaw to obtain address
    space usage and timing information, about another domain, at a
    fairly low rate.

CVE-2016-3710 (XSA-179)

    Wei Xiao and Qinghao Tang of 360.cn Inc discovered an out-of-bounds
    read and write flaw in the QEMU VGA module. A privileged guest user
    could use this flaw to execute arbitrary code on the host with the
    privileges of the hosting QEMU process.

CVE-2016-3712 (XSA-179)

    Zuozhi Fzz of Alibaba Inc discovered potential integer overflow
    or out-of-bounds read access issues in the QEMU VGA module. A
    privileged guest user could use this flaw to mount a denial of
    service (QEMU process crash).

CVE-2016-3960 (XSA-173)

    Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360
    discovered an integer overflow in the x86 shadow pagetable code. A
    HVM guest using shadow pagetables can cause the host to crash. A PV
    guest using shadow pagetables (i.e. being migrated) with PV
    superpages enabled (which is not the default) can crash the host, or
    corrupt hypervisor memory, potentially leading to privilege
    escalation.

CVE-2016-4480 (XSA-176)

    Jan Beulich discovered that incorrect page table handling could
    result in privilege escalation inside a Xen guest instance.

CVE-2016-6258 (XSA-182)

    Jérémie Boutoille discovered that incorrect pagetable handling in
    PV instances could result in guest to host privilege escalation.

Additionally this Xen Security Advisory without a CVE was fixed:

XSA-166

    Konrad Rzeszutek Wilk and Jan Beulich discovered that ioreq handling
    is possibly susceptible to a multiple read issue.

For Debian 7 "Wheezy", these problems have been fixed in version
4.1.6.lts1-1.

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
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