Test ID:	1.3.6.1.4.1.25623.1.0.68491
Category:	Ubuntu Local Security Checks
Title:	Ubuntu USN-1008-1 (libvirt)
Summary:	NOSUMMARY
Description:	Description: The remote host is missing an update to libvirt announced via advisory USN-1008-1. Details follow: It was discovered that libvirt would probe disk backing stores without consulting the defined format for the disk. A privileged attacker in the guest could exploit this to read arbitrary files on the host. This issue only affected Ubuntu 10.04 LTS. By default, guests are confined by an AppArmor profile which provided partial protection against this flaw. (CVE-2010-2237, CVE-2010-2238) It was discovered that libvirt would create new VMs without setting a backing store format. A privileged attacker in the guest could exploit this to read arbitrary files on the host. This issue did not affect Ubuntu 8.04 LTS. In Ubuntu 9.10 and later guests are confined by an AppArmor profile which provided partial protection against this flaw. (CVE-2010-2239) Jeremy Nickurak discovered that libvirt created iptables rules with too lenient mappings of source ports. A privileged attacker in the guest could bypass intended restrictions to access privileged resources on the host. (CVE-2010-2242) Solution: The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: libvirt-bin 0.4.0-2ubuntu8.3 libvirt0 0.4.0-2ubuntu8.3 Ubuntu 9.04: libvirt-bin 0.6.1-0ubuntu5.2 libvirt0 0.6.1-0ubuntu5.2 Ubuntu 9.10: libvirt-bin 0.7.0-1ubuntu13.2 libvirt0 0.7.0-1ubuntu13.2 Ubuntu 10.04 LTS: libvirt-bin 0.7.5-5ubuntu27.5 libvirt0 0.7.5-5ubuntu27.5 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: The previous version of libvirt on Ubuntu 10.04 LTS would probe a qemu disk to determine its format and did not require that the format be declared in the XML. This is considered a security problem in most deployments and this version of libvirt will default to the 'raw' format when the format is not specified in the XML. As a result, non-raw disks without a specified disk format will no longer be available in existing virtual machines. The libvirt-migrate-qemu-disks tool is provided to aid in transitioning virtual machine definitions to the new required format. In essence, it will check all domains for affected virtual machines, probe the affected disks and update the domain definition accordingly. This command will be run automatically on upgrade. For new virtual machines using non-raw images, the disk format must be specified in the domain XML provided to libvirt, otherwise the disk will not be available to the virtual machine. See man 1 libvirt-migrate-qemu-disks for details. Users who require the old behavior can adjust the 'allow_disk_format_probing' option in /etc/libvirt/qemu.conf. http://www.securityspace.com/smysecure/catid.html?in=USN-1008-1 Risk factor : Medium CVSS Score: 4.4
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2010-2237 ADV-2010-2763 http://www.vupen.com/english/advisories/2010/2763 FEDORA-2010-10960 http://lists.fedoraproject.org/pipermail/package-announce/2010-July/044520.html FEDORA-2010-11021 http://lists.fedoraproject.org/pipermail/package-announce/2010-July/044579.html SUSE-SR:2010:017 http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html USN-1008-1 http://ubuntu.com/usn/usn-1008-1 USN-1008-2 http://ubuntu.com/usn/usn-1008-2 USN-1008-3 http://ubuntu.com/usn/usn-1008-3 http://libvirt.org/news.html https://bugzilla.redhat.com/show_bug.cgi?id=607810 Common Vulnerability Exposure (CVE) ID: CVE-2010-2238 https://bugzilla.redhat.com/show_bug.cgi?id=607811 Common Vulnerability Exposure (CVE) ID: CVE-2010-2239 ADV-2010-2062 http://www.vupen.com/english/advisories/2010/2062 RHSA-2010:0615 http://www.redhat.com/support/errata/RHSA-2010-0615.html https://bugzilla.redhat.com/show_bug.cgi?id=607812 Common Vulnerability Exposure (CVE) ID: CVE-2010-2242 https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/591943 https://bugzilla.redhat.com/show_bug.cgi?id=602455
Copyright	Copyright (c) 2010 E-Soft Inc. http://www.securityspace.com

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