Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2012.0859
xen security update
10 September 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: xen
Publisher: Debian
Operating System: Debian GNU/Linux 6
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2012-3496 CVE-2012-3494
Reference: ESB-2012.0849
Original Bulletin:
http://www.debian.org/security/2012/dsa-2544
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running xen check for an updated version of the software for their
operating system.
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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
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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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