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    Debian: DSA-2501-1: xen security update

    Date
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    Several vulnerabilities were discovered in Xen, a hypervisor. CVE-2012-0217 Xen does not properly handle uncanonical return addresses on
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    Debian Security Advisory DSA-2501-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                            Florian Weimer
    June 24, 2012                          https://www.debian.org/security/faq
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    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: 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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