Linux Security
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    Debian: DSA-2662-1: xen security update

    Date 18 Apr 2013
    174
    Posted By LinuxSecurity Advisories
    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-2662-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                      Salvatore Bonaccorso
    April 18, 2013                         https://www.debian.org/security/faq
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    Package        : xen
    Vulnerability  : several
    Problem type   : remote
    Debian-specific: no
    CVE ID         : CVE-2013-1917 CVE-2013-1919
    
    Multiple vulnerabilities have been discovered in the Xen hypervisor. The
    Common Vulnerabilities and Exposures project identifies the following
    problems:
    
    CVE-2013-1917
        The SYSENTER instruction can be used by PV guests to accelerate
        system call processing. This instruction, however, leaves the EFLAGS
        register mostly unmodified. This can be used by malicious or buggy
        user space to cause the entire host to crash.
    
    CVE-2013-1919
        Various IRQ related access control operations may not have the
        intended effect, potentially permitting a stub domain to grant its
        client domain access to an IRQ it doesn't have access to itself.
        This can be used by malicious or buggy stub domains kernels to mount
        a denial of service attack possibly affecting the whole system.
    
    For the stable distribution (squeeze), these problems have been fixed in
    version 4.0.1-5.9.
    
    For the testing distribution (wheezy) and the unstable distribution
    (sid), these problems will be fixed soon.
    
    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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