DSA-1962-1: New kvm packages fix several vulnerabilities
Posted on: 12/23/2009 02:00 PM

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

Hash: SHA1

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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:


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.


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.


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

For the stable distribution (lenny), these problems have been fixed in version

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
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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:

Size/MD5 checksum: 3250251 899a66ae2ea94e994e06f637e1afef4a
Size/MD5 checksum: 42354 12a3490ebcba2c1e9aa2a86140eaa2e3
Size/MD5 checksum: 1349 95ea1b5511954549694e198b838e308c

Architecture independent packages:

Size/MD5 checksum: 158524 70f46f694afd3169ce16a4c84ee32eb6

amd64 architecture (AMD x86_64 (AMD64))

Size/MD5 checksum: 1105892 22f218058f3cc3f8d40ca9069ff151f9

i386 architecture (Intel ia32)

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;
Version: GnuPG v1.4.10 (GNU/Linux)


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