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