Debian: DSA-3663-1: xen security update

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

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Debian Security Advisory DSA-3663-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
September 09, 2016                    https://www.debian.org/security/faq
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Package        : xen
CVE ID         : CVE-2016-7092 CVE-2016-7094 CVE-2016-7154

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.

CVE-2016-7154 (XSA-188)

    Mikhail Gorobets of Advanced Threat Research, Intel Security
    discovered a use after free flaw in the FIFO event channel code. A
    malicious guest administrator can crash the host, leading to a
    denial of service. Arbitrary code execution (and therefore privilege
    escalation), and information leaks, cannot be excluded.

For the stable distribution (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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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