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Ubuntu Security Notice USN-1954-1

Ubuntu Security Notice USN-1954-1
Posted Sep 18, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1954-1 - It was discovered that libvirt used the pkcheck tool in an unsafe manner. A local attacker could possibly use this flaw to bypass polkit authentication. In Ubuntu, libvirt polkit authentication is not enabled by default. It was discovered that libvirt incorrectly handled certain memory stats requests. A remote attacker could use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS, Ubuntu 12.10, and Ubuntu 13.04. Various other issues were also addressed.

tags | advisory, remote, denial of service, local
systems | linux, ubuntu
advisories | CVE-2013-4311, CVE-2013-4296, CVE-2013-5651, CVE-2013-4296, CVE-2013-4311, CVE-2013-5651
SHA-256 | 59ff3bfce1b5160cbf39adc5e7dbd353a7a26360a5e79205fa96bcdf56cace17

Ubuntu Security Notice USN-1954-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1954-1
September 18, 2013

libvirt vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in libvirt.

Software Description:
- libvirt: Libvirt virtualization toolkit

Details:

It was discovered that libvirt used the pkcheck tool in an unsafe manner. A
local attacker could possibly use this flaw to bypass polkit
authentication. In Ubuntu, libvirt polkit authentication is not enabled by
default. (CVE-2013-4311)

It was discovered that libvirt incorrectly handled certain memory stats
requests. A remote attacker could use this issue to cause libvirt to
crash, resulting in a denial of service. This issue only affected Ubuntu
12.04 LTS, Ubuntu 12.10, and Ubuntu 13.04. (CVE-2013-4296)

It was discovered that libvirt incorrectly handled certain bitmap
operations. A remote attacker could use this issue to cause libvirt to
crash, resulting in a denial of service. This issue only affected Ubuntu
13.04. (CVE-2013-5651)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.04:
libvirt-bin 1.0.2-0ubuntu11.13.04.4
libvirt0 1.0.2-0ubuntu11.13.04.4

Ubuntu 12.10:
libvirt-bin 0.9.13-0ubuntu12.5
libvirt0 0.9.13-0ubuntu12.5

Ubuntu 12.04 LTS:
libvirt-bin 0.9.8-2ubuntu17.13
libvirt0 0.9.8-2ubuntu17.13

Ubuntu 10.04 LTS:
libvirt-bin 0.7.5-5ubuntu27.24
libvirt0 0.7.5-5ubuntu27.24

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1954-1
CVE-2013-4296, CVE-2013-4311, CVE-2013-5651

Package Information:
https://launchpad.net/ubuntu/+source/libvirt/1.0.2-0ubuntu11.13.04.4
https://launchpad.net/ubuntu/+source/libvirt/0.9.13-0ubuntu12.5
https://launchpad.net/ubuntu/+source/libvirt/0.9.8-2ubuntu17.13
https://launchpad.net/ubuntu/+source/libvirt/0.7.5-5ubuntu27.24
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