06 July 2011
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.0699 Important: qemu-kvm security and bug fix update 6 July 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: qemu-kvm Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Red Hat Enterprise Linux WS/Desktop 6 Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2011-2512 CVE-2011-2212 Reference: ESB-2011.0690 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2011-0919.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: qemu-kvm security and bug fix update Advisory ID: RHSA-2011:0919-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0919.html Issue date: 2011-07-05 CVE Names: CVE-2011-2212 CVE-2011-2512 ===================================================================== 1. Summary: Updated qemu-kvm packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. 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 3. Description: 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 subsystem in qemu-kvm did not properly validate virtqueue in and out requests from the guest. A privileged guest user could use this flaw to trigger a buffer overflow, allowing them to crash the guest (denial of service) or, possibly, escalate their privileges on the host. (CVE-2011-2212) It was found that the virtio_queue_notify() function in qemu-kvm did not perform sufficient input validation on the value later used as an index into the array of virtqueues. An unprivileged guest user could use this flaw to crash the guest (denial of service) or, possibly, escalate their privileges on the host. (CVE-2011-2512) Red Hat would like to thank Nelson Elhage for reporting CVE-2011-2212. This update also fixes the following bug: * A bug was found in the way vhost (in qemu-kvm) set up mappings with the host kernel's vhost module. This could result in the host kernel's vhost module not having a complete view of a guest system's memory, if that guest had more than 4 GB of memory. Consequently, hot plugging a vhost-net network device and restarting the guest may have resulted in that device no longer working. (BZ#701771) All users of qemu-kvm should upgrade to these updated packages, which contain backported patches to resolve these issues. 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. 4. 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 5. Bugs fixed (http://bugzilla.redhat.com/): 713589 - CVE-2011-2212 qemu-kvm: virtqueue: too-large indirect descriptor buffer overflow 717399 - CVE-2011-2512 qemu-kvm: OOB memory access caused by negative vq notifies 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm x86_64: qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm x86_64: qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm x86_64: qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm x86_64: qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.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 7. References: https://www.redhat.com/security/data/cve/CVE-2011-2212.html https://www.redhat.com/security/data/cve/CVE-2011-2512.html https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <email@example.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2011 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFOE1QMXlSAg2UNWIIRAiqyAJ0YZRdZLS/o8v6GpSJVdixf7dqXjQCgoCi6 FdDb471yututyx66yC/Sm1s= =MaoZ - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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