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[SECURITY] [DSA-1962-1] New kvm packages fix several vulnerabilities



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Debian Security Advisory DSA-1962                  security@xxxxxxxxxx
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.

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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: debian-security-announce@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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