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    Debian: DSA-2544-1: xen security update

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    Multiple denial of service vulnerabilities have been discovered in xen, an hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:
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    Debian Security Advisory DSA-2544-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                          Raphael Geissert
    September 08, 2012                     https://www.debian.org/security/faq
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    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: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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