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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0843 Important: kvm security update 6 September 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kvm Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 5 Red Hat Enterprise Linux WS/Desktop 5 Impact/Access: Denial of Service -- Existing Account Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2012-3515 Reference: ESB-2012.0842 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2012-1235.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----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 <secalert@redhat.com>. 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----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUEguGO4yVqjM2NGpAQJc7w/+MSCiOiDlxX/QaFbSN4Xn/cKIUyU8RTjL 14GzIRLsZsT8qEfm9+I4yg6aHx/s27n6y9wctWNNV9RaTDxr7/aaLANTWI1OW6YD tKoe8TfMMmkgHkuLq1Yo2Qb7V3i8QR/TZJdCMQbNEe+9yA0UDbeKhyhfS99JQOy0 9aIamn1az4nNvNYdjduLBOP9+a0aASEJAW0LZckMolMpT+r9vTycGhn61GOxuvdK N9agop++2J1qjaUDmDojsCnHRwOgue16h/QsvlDU0DcLYY9kbqdvA2dbNiKRj63g SXyoKgYjMVAjnSKNdB1vmLSqw0IOf0drxTAmC6PFL11I9LtPuxq1FWZH04PTHtst cB+Afa/w3zUFoNRnO1XOOFOU3ohIrhhQ5+LOffKthdPRpe5tZ/QtSL3+KYBQxgqE VY+dZmm1FYLkAaiZGYHwFM2l1qu9DDKpixwUjZcg9v89SGRbNxKNjDWLwDErjoUc XCCg589XxvsCgVXa0yVbAIEpGpYyWkbd5FgSKbUHy2jKYHiY3zuP89BA9nXNuMqf WmQ66kgKJN6J1OGwwQCULvzeCq0n0t+eVfWySj6RXZe0LjomKTvMqhpT97EPI5Of uVoefS6yA9YSTitbsA61BfCEJruGwgSNFZA5j0KrVdHqIB2FppgLruGTM39vCn06 eZc5HJz4sy0= =WXd1 -----END PGP SIGNATURE-----