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Debian: Security update for Xen

Several vulnerabilities were discovered in the Xen virtual machine hypervisor. 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. Local users can cause a denial of service and possibly execute arbitrary code via a crafted paravirtualised guest kernel image. 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. Updated packages are available from security.debian.org.

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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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