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[Full-disclosure] [SECURITY] [DSA 1907-1] New kvm packages fix several vulnerabilities

From: Giuseppe Iuculano (iuculanodebian.org)
Date: Tue Oct 13 2009 - 03:30:55 CDT

Hash: SHA1

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Debian Security Advisory DSA-1907-1 securitydebian.org
http://www.debian.org/security/ Giuseppe Iuculano
October 13, 2009 http://www.debian.org/security/faq
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Package : kvm
Vulnerability : several vulnerabilities
Problem type : local (remote)
Debian-specific: no
Debian bugs : 509997 548975
CVE Ids : CVE-2008-5714 CVE-2009-3290

Several vulnerabilities have been discovered in kvm, a full virtualization system.
The Common Vulnerabilities and Exposures project identifies the
following problems:


Chris Webb discovered an off-by-one bug limiting KVM's VNC passwords to 7
characters. This flaw might make it easier for remote attackers to guess the VNC
password, which is limited to seven characters where eight was intended.


It was discovered that the kvm_emulate_hypercall function in KVM does not
prevent access to MMU hypercalls from ring 0, which allows local guest OS users
to cause a denial of service (guest kernel crash) and read or write guest kernel

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

The oldstable distribution (etch) does not contain kvm.

For the testing distribution (squeeze) these problems will be fixed soon.

For the unstable distribution (sid) these problems have been fixed in version

We recommend that you upgrade your kvm packages.

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:

    Size/MD5 checksum: 1349 da207d5f42ab45ed3956be5fcb6ad685
    Size/MD5 checksum: 41138 f28b640e60392636399873e99b6cc5e3
    Size/MD5 checksum: 3250251 899a66ae2ea94e994e06f637e1afef4a

Architecture independent packages:

    Size/MD5 checksum: 158242 8cee5a68dadbbceecdac6330b69fa59f

amd64 architecture (AMD x86_64 (AMD64))

    Size/MD5 checksum: 1099546 5009415dc4927800b33249ca31d8a651

i386 architecture (Intel ia32)

    Size/MD5 checksum: 1030530 313f1a0d91889bf167c4e1aaf57a027d

  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-announcelists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
Version: GnuPG v1.4.10 (GNU/Linux)


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