Debian: DSA-1962-1: New kvm packages fix several vulnerabilities

    Date23 Dec 2009
    CategoryDebian
    21
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in kvm, a full virtualization system. The Common Vulnerabilities and Exposures project identifies the following problems:
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    Debian Security Advisory DSA-1962                  This email address is being protected from spambots. You need JavaScript enabled to view it.
    http://www.debian.org/security/                      Giuseppe Iuculano
    December 23, 2009                   http://www.debian.org/security/faq
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    Package        : kvm
    Vulnerability  : several vulnerabilities
    Problem type   : local
    Debian-specific: no
    Debian bugs    : 557739 562075 562076
    CVE Ids        : CVE-2009-3638 CVE-2009-3722 CVE-2009-4031
    
    
    Several vulnerabilities have been discovered in kvm, a full virtualization system.
    The Common Vulnerabilities and Exposures project identifies the
    following problems:
    
    CVE-2009-3638
    
    It was discovered an Integer overflow in the kvm_dev_ioctl_get_supported_cpuid
    function. This allows local users to have an unspecified impact via a
    KVM_GET_SUPPORTED_CPUID request to the kvm_arch_dev_ioctl function.
    
    
    CVE-2009-3722
    
    It was discovered that the handle_dr function in the KVM subsystem does not
    properly verify the Current Privilege Level (CPL) before accessing a debug
    register, which allows guest OS users to cause a denial of service (trap) on the
    host OS via a crafted application.
    
    
    CVE-2009-4031
    
    It was discovered that the do_insn_fetch function in the x86 emulator in the KVM
    subsystem tries to interpret instructions that contain too many bytes to be
    valid, which allows guest OS users to cause a denial of service (increased
    scheduling latency) on the host OS via unspecified manipulations related to SMP
    support.
    
    
    For the stable distribution (lenny), these problems have been fixed in version
    72+dfsg-5~lenny4.
    
    For the testing distribution (squeeze), and the unstable distribution (sid),
    these problems will be fixed soon.
    
    
    We recommend that you upgrade your kvm package.
    
    Upgrade instructions
    - --------------------
    
    wget url
            will fetch the file for you
    dpkg -i file.deb
            will install the referenced file.
    
    If you are using the apt-get package manager, use the line for
    sources.list as given below:
    
    apt-get update
            will update the internal database
    apt-get upgrade
            will install corrected packages
    
    You may use an automated update by adding the resources from the
    footer to the proper configuration.
    
    
    Debian GNU/Linux 5.0 alias lenny
    - --------------------------------
    
    Debian (stable)
    - ---------------
    
    Stable updates are available for alpha, amd64, arm, armel, hppa, i386, ia64,
    mips, mipsel, powerpc, s390 and sparc.
    
    Source archives:
    
      http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg.orig.tar.gz
        Size/MD5 checksum:  3250251 899a66ae2ea94e994e06f637e1afef4a
      http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny4.diff.gz
        Size/MD5 checksum:    42354 12a3490ebcba2c1e9aa2a86140eaa2e3
      http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny4.dsc
        Size/MD5 checksum:     1349 95ea1b5511954549694e198b838e308c
    
    Architecture independent packages:
    
    
    http://security.debian.org/pool/updates/main/k/kvm/kvm-source_72+dfsg-5~lenny4_all.deb
        Size/MD5 checksum:   158524 70f46f694afd3169ce16a4c84ee32eb6
    
    amd64 architecture (AMD x86_64 (AMD64))
    
      http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny4_amd64.deb
        Size/MD5 checksum:  1105892 22f218058f3cc3f8d40ca9069ff151f9
    
    i386 architecture (Intel ia32)
    
      http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny4_i386.deb
        Size/MD5 checksum:  1030580 ffdfcfce508514828bf455183e45f581
    
    
      These files will probably be moved into the stable distribution on
      its next update.
    
    - ---------------------------------------------------------------------------------
    For apt-get: deb http://security.debian.org/ stable/updates main
    For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    Package info: `apt-cache show ' and http://packages.debian.org/
    
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