4 Security Updates for Debian
Posted on: 09/09/2012 07:56 AM

The following 4 updates has been released for Debisn GNU/Linux: [SECURITY] [DSA 2545-1] qemu security update, [SECURITY] [DSA 2544-1] xen security update, [SECURITY] [DSA 2543-1] xen-qemu-dm-4.0 security update, and [SECURITY] [DSA 2542-1] qemu-kvm security update

[SECURITY] [DSA 2545-1] qemu security update
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Debian Security Advisory DSA-2545-1 security@debian.org
http://www.debian.org/security/ Raphael Geissert
September 08, 2012 http://www.debian.org/security/faq
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Package : qemu
Vulnerability : multiple
Problem type : local
Debian-specific: no
CVE ID : CVE-2012-2652 CVE-2012-3515

Multiple vulnerabilities have been discovered in qemu, a fast processor
emulator. The Common Vulnerabilities and Exposures project identifies the
following problems:

CVE-2012-2652:

The snapshot mode of QEMU (-snapshot) incorrectly handles temporary
files used to store the current state, making it vulnerable to
symlink attacks (including arbitrary file overwriting and guest
information disclosure) due to a race condition.

CVE-2012-3515:

QEMU does not properly handle VT100 escape sequences when emulating
certain devices with a virtual console backend. An attacker within a
guest with access to the vulnerable virtual console could overwrite
memory of QEMU and escalate privileges to that of the qemu process.

For the stable distribution (squeeze), these problems have been fixed in
version 0.12.5+dfsg-3squeeze2.

For the testing distribution (wheezy), and the unstable distribution
(sid), these problems will been fixed soon.

We recommend that you upgrade your qemu 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/

[SECURITY] [DSA 2544-1] xen security update
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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/

[SECURITY] [DSA 2543-1] xen-qemu-dm-4.0 security update
- -------------------------------------------------------------------------
Debian Security Advisory DSA-2543-1 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-qemu-dm-4.0
Vulnerability : multiple
Problem type : local
Debian-specific: no
CVE ID : CVE-2012-3515 CVE-2012-4411

Multiple vulnerabilities have been discovered in xen-qemu-dm-4.0, the Xen
Qemu Device Model virtual machine hardware emulator. The Common
Vulnerabilities and Exposures project identifies the following problems:

CVE-2012-3515:

The device model for HVM domains does not properly handle VT100
escape sequences when emulating certain devices with a virtual
console backend. An attacker within a guest with access to the
vulnerable virtual console could overwrite memory of the device
model and escalate privileges to that of the device model process.

CVE-2012-4411:

The qemu monitor was enabled by default, allowing administrators of
a guest to access resources of the host, possibly escalate privileges
or access resources belonging to another guest.

For the stable distribution (squeeze), these problems have been fixed in
version 4.0.1-2+squeeze2.

The testing distribution (wheezy), and the unstable distribution (sid),
no longer contain this package.

We recommend that you upgrade your xen-qemu-dm-4.0 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/

[SECURITY] [DSA 2542-1] qemu-kvm security update
- -------------------------------------------------------------------------
Debian Security Advisory DSA-2542-1 security@debian.org
http://www.debian.org/security/ Raphael Geissert
September 08, 2012 http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : qemu-kvm
Vulnerability : multiple
Problem type : local
Debian-specific: no
CVE ID : CVE-2012-2652 CVE-2012-3515

Multiple vulnerabilities have been discovered in qemu-kvm, a full
virtualization solution on x86 hardware. The Common Vulnerabilities
and Exposures project identifies the following problems:

CVE-2012-2652:

The snapshot mode of Qemu (-snapshot) incorrectly handles temporary
files used to store the current state, making it vulnerable to
symlink attacks (including arbitrary file overwriting and guest
information disclosure) due to a race condition.

CVE-2012-3515:

Qemu does not properly handle VT100 escape sequences when emulating
certain devices with a virtual console backend. An attacker within a
guest with access to the vulnerable virtual console could overwrite
memory of Qemu and escalate privileges to that of the qemu process.

For the stable distribution (squeeze), these problems have been fixed in
version 0.12.5+dfsg-5+squeeze9.

For the testing distribution (wheezy), and the unstable distribution
(sid), these problems will been fixed soon.

We recommend that you upgrade your qemu-kvm 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/




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