Security Information / 2012 / Security Information -- DSA-2544-1 xen

Debian Security Advisory

DSA-2544-1 xen -- denial of service

Date Reported:

08 Sep 2012

Affected Packages:

xen

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2012-3494, CVE-2012-3496.

More information:

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.