Ubuntu 10.04 LTS : virtinst update (USN-1008-2)

medium Nessus Plugin ID 50301

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Synopsis

The remote Ubuntu host is missing one or more security-related patches.

Description

Libvirt in Ubuntu 10.04 LTS now no longer probes qemu disks for the image format and defaults to 'raw' when the format is not specified in the XML. This change in behavior breaks virt-install --import because virtinst in Ubuntu 10.04 LTS did not allow for specifying a disk format and does not specify a format in the XML. This update adds the 'format=' option when specifying a disk. For example, to import an existing VM which uses a qcow2 disk format, use somthing like the following :

virt-install --connect=qemu:///session --name test-import --ram=256 \
--disk path=<path to qcow2 image>,format=qcow2 --import

For more information, see man 1 virt-install.

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).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected python-virtinst and / or virtinst packages.

Plugin Details

Severity: Medium

ID: 50301

File Name: ubuntu_USN-1008-2.nasl

Version: 1.9

Type: local

Agent: unix

Family: Ubuntu Local Security Checks

Published: 10/22/2010

Updated: 9/19/2019

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.7

CVSS v2

Risk Factor: Medium

Base Score: 4.4

Temporal Score: 3.3

Vector: CVSS2#AV:L/AC:M/Au:S/C:C/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:python-virtinst, p-cpe:/a:canonical:ubuntu_linux:virtinst, cpe:/o:canonical:ubuntu_linux:10.04:-:lts

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2010

Vulnerability Publication Date: 8/19/2010

Reference Information

CVE: CVE-2010-2237, CVE-2010-2238, CVE-2010-2239, CVE-2010-2242

BID: 41981

USN: 1008-2

Detections

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