-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kvm security update Advisory ID: RHSA-2012:1235-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1235.html Issue date: 2012-09-05 CVE Names: CVE-2012-3515 ===================================================================== 1. Summary: Updated kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 5. 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: RHEL Desktop Multi OS (v. 5 client) - x86_64 RHEL Virtualization (v. 5 server) - x86_64 3. Description: KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. 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"), and without specifying a serial or parallel 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 on Red Hat Enterprise Linux 5.) * Guests that were managed via libvirt, such as when using Virtual Machine Manager (virt-manager), but that have a serial or parallel 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 KVM users should upgrade to these updated packages, which correct this issue. Note: The procedure in the Solution section must be performed before this update will 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 The following procedure must be performed before this update will take effect: 1) Stop all KVM guest virtual machines. 2) Either reboot the hypervisor machine or, as the root user, remove (using "modprobe -r [module]") and reload (using "modprobe [module]") all of the following modules which are currently running (determined using "lsmod"): kvm, ksm, kvm-intel or kvm-amd. 3) Restart the KVM guest virtual machines. 5. Bugs fixed (http://bugzilla.redhat.com/): 851252 - CVE-2012-3515 qemu: VT100 emulation vulnerability 6. Package List: RHEL Desktop Multi OS (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-249.el5_8.5.src.rpm x86_64: kmod-kvm-83-249.el5_8.5.x86_64.rpm kmod-kvm-debug-83-249.el5_8.5.x86_64.rpm kvm-83-249.el5_8.5.x86_64.rpm kvm-debuginfo-83-249.el5_8.5.x86_64.rpm kvm-qemu-img-83-249.el5_8.5.x86_64.rpm kvm-tools-83-249.el5_8.5.x86_64.rpm RHEL Virtualization (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-249.el5_8.5.src.rpm x86_64: kmod-kvm-83-249.el5_8.5.x86_64.rpm kmod-kvm-debug-83-249.el5_8.5.x86_64.rpm kvm-83-249.el5_8.5.x86_64.rpm kvm-debuginfo-83-249.el5_8.5.x86_64.rpm kvm-qemu-img-83-249.el5_8.5.x86_64.rpm kvm-tools-83-249.el5_8.5.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-2012-3515.html 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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFQR4a9XlSAg2UNWIIRAhmlAKCQoRr+yx3FFIbE0hFwcJxrtKcgYgCfa4MW WuzMrb3s542bwmcl9ef21qc= =C0+E -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce