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  • [SECURITY] [DSA 2544-1] xen security update

    From Raphael Geissert@1:229/2 to All on Sun Sep 9 00:00:01 2012
    From: [email protected]

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    - ------------------------------------------------------------------------- Debian Security Advisory DSA-2544-1 [email protected] http://www.debian.org/security/ Raphael Geissert September 08, 2012 http://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package : xen
    Vulnerability : denial of service
    Problem type : local
    Debian-specific: no
    CVE ID : CVE-2012-3494 CVE-2012-3496

    Multiple denial of service vulnerabilities have been discovered in xen,
    an hypervisor. The Common Vulnerabilities and Exposures project identifies
    the following problems:

    CVE-2012-3494:

    It was discovered that set_debugreg allows writes to reserved bits
    of the DR7 debug control register on amd64 (x86-64) paravirtualised
    guests, allowing a guest to crash the host.

    CVE-2012-3496:

    Matthew Daley discovered that XENMEM_populate_physmap, when called
    with the MEMF_populate_on_demand flag set, a BUG (detection routine)
    can be triggered if a translating paging mode is not being used,
    allowing a guest to crash the host.

    For the stable distribution (squeeze), these problems have been fixed in version 4.0.1-5.4.

    For the testing distribution (wheezy), these problems will be fixed
    soon.

    For the unstable distribution (sid), these problems have been fixed in
    version 4.1.3-2.

    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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