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Debian: Security update for xen

Multiple denial of service vulnerabilities have been discovered in xen, an hypervisor. It was discovered that set_debugreg allows writes to reserved bits of the DR7 debug control register on amd64 (x86-64) paravirtualised guests, allowing a guest to crash the host. Matthew Daley discovered that XENMEM_populate_physmap, when called with the MEMF_populate_on_demand flag set, a BUG (detection routine) can be triggered if a translating paging mode is not being used, allowing a guest to crash the host.

Updated packages are available from security.debian.org.

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- -------------------------------------------------------------------------
Debian Security Advisory DSA-2544-1                   security@debian.org
http://www.debian.org/security/                          Raphael Geissert
September 08, 2012                     http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package        : xen
Vulnerability  : denial of service
Problem type   : local
Debian-specific: no
CVE ID         : CVE-2012-3494 CVE-2012-3496

Multiple denial of service vulnerabilities have been discovered in xen,
an hypervisor. The Common Vulnerabilities and Exposures project identifies
the following problems:

CVE-2012-3494:

   It was discovered that set_debugreg allows writes to reserved bits
   of the DR7 debug control register on amd64 (x86-64) paravirtualised
   guests, allowing a guest to crash the host.

CVE-2012-3496:

   Matthew Daley discovered that XENMEM_populate_physmap, when called
   with the MEMF_populate_on_demand flag set, a BUG (detection routine)
   can be triggered if a translating paging mode is not being used,
   allowing a guest to crash the host.

For the stable distribution (squeeze), these problems have been fixed in
version 4.0.1-5.4.

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

For the unstable distribution (sid), these problems have been fixed in
version 4.1.3-2.

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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