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Red Hat 6: RHSA-2011:0534-01 Critical: Qemu-KVM Security Concerns

red hat
Calendar Grey May 19, 2011
Dist Redhat Esm H88
Important upgrade for qemu-kvm to rectify significant vulnerabilities and enhance efficiency in Red Hat Enterprise Linux 6.
Updated qemu-kvm packages that fix two security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Summary

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running virtual machines using KVM.
It was found that the virtio-blk driver in qemu-kvm did not properly validate read and write requests from guests. A privileged guest user could use this flaw to crash the guest or, possibly, execute arbitrary code on the host. (CVE-2011-1750)
It was found that the PIIX4 Power Management emulation layer in qemu-kvm did not properly check for hot plug eligibility during device removals. A privileged guest user could use this flaw to crash the guest or, possibly, execute arbitrary code on the host. (CVE-2011-1751)
Red Hat would like to thank Nelson Elhage for reporting CVE-2011-1751.
This update also fixes several bugs and adds various enhancements. Documentation for these bug fixes and enhancements will be available shortly from the Technical Notes document, linked to in the References section.
All users of qemu-kvm should upgrade to these updated packages, which contain backported patches to resolve these issues, and fix the bugs and add the enhancements noted in the Technical Notes. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Topics%20covered

Topics Covered

security advisory red hat critical bug fix enhancements qemu-kvm

References

https://access.redhat.com/security/cve/CVE-2011-1750 https://access.redhat.com/security/cve/CVE-2011-1751 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/search/

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
x86_64: qemu-img-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key#package


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:0534-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0534.html
Issue date: 2011-05-19

Topic

Updated qemu-kvm packages that fix two security issues, several bugs, andadd various enhancements are now available for Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. Common Vulnerability Scoring System (CVSS) basescores, which give detailed severity ratings, are available for eachvulnerability from the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory red hat critical bug fix enhancements qemu-kvm

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - x86_64

Red Hat Enterprise Linux Workstation (v. 6) - x86_64

Bugs Fixed

482427 - support high resolutions

581750 - Vhost: Segfault when assigning a none vhostfd

596610 - "Guest moved used index from 0 to 61440" if remove virtio serial device before virtserialport

599307 - info snapshot return "bdrv_snapshot_list: error -95"

602205 - Could not ping guest successfully after changing e1000 MTU

603413 - RHEL3.9 guest netdump hung with e1000

604992 - index is empty in qemu-doc.html

607598 - Incorrect & misleading error reporting when failing to open a drive due to block driver whitelist denial

608548 - QEMU doesn't respect hardware sector size of underlying block device when doing O_DIRECT

609016 - incorrect committed memory on idle host

613893 - [RFE] qemu-io enable truncate function for qcow2.

615947 - RFE QMP: support of query spice for guest

616187 - vmware device emulation enabled but not supported

616659 - mrg buffers: migration breaks between systems with/without vhost

616703 - qemu-kvm core dump with virtio-serial-pci max-port greater than 31

617119 - Qemu becomes unresponsive during unattended_installation

619168 - qemu should more clearly indicate internal detection of this host out-of-memory condition at startup..

619259 - qemu "-cpu [check | enforce ]" should work even when a model name is not specified on the command line

623552 - SCP image fails from host to guest with vhost on when do migration

623735 - hot unplug of vhost net virtio NIC causes qemu segfault

Read the Full Advisory

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