DSA-1962-1: New kvm packages fix several vulnerabilities
Posted on: 12/23/2009 01:00 PM

The Debian Security Team published a new security update for Debian GNU/Linux. Here the announcement:

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Debian Security Advisory DSA-1962 security@debian.org
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
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Debian (stable)
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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@lists.debian.org
Package info: `apt-cache show lt;pkggt;' and http://packages.debian.org/lt;pkggt;
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