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Red Hat: 2012:1234-01 Important: qemu-kvm Critical Issue Remote Execution

Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having [More...]. ==================================================================== Red Hat Security Advisory Synopsis: Important: qemu-kvm security update Advisory ID: RHSA-2012:1234-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2012:1234.html Issue date: 2012-09-05 CVE Names: CVE-2012-3515 ==================================================================== 1. Summary: Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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. A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. (CVE-2012-3515) This flaw did not affect the default use of KVM. Affected configurations were: * When guests were started from the command line ("/usr/libexec/qemu-kvm") without the "-nodefaults" option, and also without specifying a serial orparallel device, or a virtio-console device, that specifically does not use a virtual console (vc) back-end. (Note that Red Hat does not support invoking "qemu-kvm" from the command line without "-nodefaults" on Red Hat Enterprise Linux 6.) * Guests that were managed via libvirt, such as when using Virtual Machine Manager (virt-manager), but that have a serial or parallel device, or a virtio-console device, that uses a virtual console back-end. By default, guests managed via libvirt will not use a virtual console back-end for such devices. Red Hat would like to thank the Xen project for reporting this issue. All users of qemu-kvm should upgrade to these updated packages, which resolve this issue. 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/knowledge/articles/11258 5. Bugs fixed (http://bugzilla.redhat.com/): 851252 - CVE-2012-3515 qemu: VT100 emulation vulnerability 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: x86_64: qemu-guest-agent-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-img-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.295.el6_3.2.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: x86_64: qemu-guest-agent-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-img-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.295.el6_3.2.x86_64.rpm Red Hat Enterprise Linux Server (v.6): Source: x86_64: qemu-guest-agent-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-img-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.295.el6_3.2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: x86_64: qemu-guest-agent-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-img-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.295.el6_3.2.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.295.el6_3.2.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://access.redhat.com/security/cve/CVE-2012-3515 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2012 Red Hat, Inc. . Recent updates to qemu-kvm packages for Red Hat resolve a significant security vulnerability that affects virtual environments. More information below.. Kernel Security, Red Hat Virtualization, Privilege Escalation. . Severity: Important. LinuxSecurity.com Team

Sep 05, 2012 •Important Red Hat