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  • [SECURITY] [DSA 2501-1] xen security update

    From Florian Weimer@1:229/2 to All on Sun Jun 24 17:30:03 2012
    From: [email protected]

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    - ------------------------------------------------------------------------- Debian Security Advisory DSA-2501-1 [email protected] http://www.debian.org/security/ Florian Weimer
    June 24, 2012 http://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package : xen
    Vulnerability : several
    Problem type : local
    Debian-specific: no
    CVE ID : CVE-2012-0217 CVE-2012-0218 CVE-2012-2934

    Several vulnerabilities were discovered in Xen, a hypervisor.

    CVE-2012-0217
    Xen does not properly handle uncanonical return addresses on
    Intel amd64 CPUs, allowing amd64 PV guests to elevate to
    hypervisor privileges. AMD processors, HVM and i386 guests
    are not affected.

    CVE-2012-0218
    Xen does not properly handle SYSCALL and SYSENTER instructions
    in PV guests, allowing unprivileged users inside a guest
    system to crash the guest system.

    CVE-2012-2934
    Xen does not detect old AMD CPUs affected by AMD Erratum #121.

    For CVE-2012-2934, Xen refuses to start domUs on affected systems
    unless the "allow_unsafe" option is passed.

    For the stable distribution (squeeze), these problems have been fixed
    in version 4.0.1-5.2.

    For the testing distribution (wheezy) and the unstable distribution
    (sid), these problems have been fixed in version 4.1.3~rc1+hg-20120614.a9c0a89c08f2-1.

    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: http://www.debian.org/security/

    Mailing list: [email protected]
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