Operating System:

[Debian]

Published:

07 November 2011

Protect yourself against future threats.

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.1110
                            xen security update
                              7 November 2011

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           xen
Publisher:         Debian
Operating System:  Debian GNU/Linux 6
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-3262 CVE-2011-1898 CVE-2011-1583
                   CVE-2011-1166  

Reference:         ESB-2011.0872
                   ESB-2011.0864
                   ESB-2011.0519

Original Bulletin: 
   http://www.debian.org/security/2011/dsa-2337

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Debian Security Advisory DSA-2337-1                   security@debian.org
http://www.debian.org/security/                           Thijs Kinkhorst
November 6, 2011                       http://www.debian.org/security/faq
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Package        : xen
Vulnerability  : several vulnerabilities
Problem type   : local
Debian-specific: no
CVE ID         : CVE-2011-1166 CVE-2011-1583 CVE-2011-1898 CVE-2011-3262

Several vulnerabilities were discovered in the Xen virtual machine
hypervisor. 

CVE-2011-1166

  A 64-bit guest can get one of its vCPU'ss into non-kernel
  mode without first providing a valid non-kernel pagetable,
  thereby locking up the host system.

CVE-2011-1583, CVE-2011-3262

  Local users can cause a denial of service and possibly execute
  arbitrary code via a crafted paravirtualised guest kernel image.

CVE-2011-1898

  When using PCI passthrough on Intel VT-d chipsets that do not
  have interrupt remapping, guest OS can users to gain host OS
  privileges by writing to the interrupt injection registers.

The oldstable distribution (lenny) contains a different version of Xen
not affected by these problems.

For the stable distribution (squeeze), this problem has been fixed in
version 4.0.1-4.

For the testing (wheezy) and unstable distribution (sid), this problem
has been fixed in version 4.1.1-1.

We recommend that you upgrade your xen packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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