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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.0949 Important: kernel security and bug fix update 10 July 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2013-1848 CVE-2013-1798 CVE-2013-1797 CVE-2013-1796 CVE-2013-1773 Reference: ESB-2013.0818 ESB-2013.0715 ESB-2013.0702 ESB-2013.0693 ESB-2013.0691 ESB-2013.0645 ESB-2013.0573 ESB-2013.0572 ESB-2013.0512 ESB-2013.0333 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2013-1026.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2013:1026-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-1026.html Issue date: 2013-07-09 CVE Names: CVE-2013-1773 CVE-2013-1796 CVE-2013-1797 CVE-2013-1798 CVE-2013-1848 ===================================================================== 1. Summary: Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.2 Extended Update Support. 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 Server EUS (v. 6.2) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 6.2) - i386, ppc64, s390x, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * A buffer overflow flaw was found in the way UTF-8 characters were converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's FAT file system implementation. A local user able to mount a FAT file system with the "utf8=1" option could use this flaw to crash the system or, potentially, to escalate their privileges. (CVE-2013-1773, Important) * A flaw was found in the way KVM (Kernel-based Virtual Machine) handled guest time updates when the buffer the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) crossed a page boundary. A privileged guest user could use this flaw to crash the host or, potentially, escalate their privileges, allowing them to execute arbitrary code at the host kernel level. (CVE-2013-1796, Important) * A potential use-after-free flaw was found in the way KVM handled guest time updates when the GPA (guest physical address) the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) fell into a movable or removable memory region of the hosting user-space process (by default, QEMU-KVM) on the host. If that memory region is deregistered from KVM using KVM_SET_USER_MEMORY_REGION and the allocated virtual memory reused, a privileged guest user could potentially use this flaw to escalate their privileges on the host. (CVE-2013-1797, Important) * A flaw was found in the way KVM emulated IOAPIC (I/O Advanced Programmable Interrupt Controller). A missing validation check in the ioapic_read_indirect() function could allow a privileged guest user to crash the host, or read a substantial portion of host kernel memory. (CVE-2013-1798, Important) * A format string flaw was found in the ext3_msg() function in the Linux kernel's ext3 file system implementation. A local user who is able to mount an ext3 file system could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2013-1848, Low) Red Hat would like to thank Andrew Honig of Google for reporting CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798. This update also fixes several bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section. Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted 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/site/articles/11258 To install kernel packages manually, use "rpm -ivh [package]". Do not use "rpm -Uvh" as that will remove the running kernel binaries from your system. You may use "rpm -e" to remove old kernels after determining that the new kernel functions properly on your system. 5. Bugs fixed (http://bugzilla.redhat.com/): 916115 - CVE-2013-1773 kernel: VFAT slab-based buffer overflow 917012 - CVE-2013-1796 kernel: kvm: buffer overflow in handling of MSR_KVM_SYSTEM_TIME 917013 - CVE-2013-1797 kernel: kvm: after free issue with the handling of MSR_KVM_SYSTEM_TIME 917017 - CVE-2013-1798 kernel: kvm: out-of-bounds access in ioapic indirect register reads 920783 - CVE-2013-1848 kernel: ext3: format string issues 6. Package List: Red Hat Enterprise Linux Server EUS (v. 6.2): Source: kernel-2.6.32-220.39.1.el6.src.rpm i386: kernel-2.6.32-220.39.1.el6.i686.rpm kernel-debug-2.6.32-220.39.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-220.39.1.el6.i686.rpm kernel-debug-devel-2.6.32-220.39.1.el6.i686.rpm kernel-debuginfo-2.6.32-220.39.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-220.39.1.el6.i686.rpm kernel-devel-2.6.32-220.39.1.el6.i686.rpm kernel-headers-2.6.32-220.39.1.el6.i686.rpm perf-2.6.32-220.39.1.el6.i686.rpm perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm noarch: kernel-doc-2.6.32-220.39.1.el6.noarch.rpm kernel-firmware-2.6.32-220.39.1.el6.noarch.rpm ppc64: kernel-2.6.32-220.39.1.el6.ppc64.rpm kernel-bootwrapper-2.6.32-220.39.1.el6.ppc64.rpm kernel-debug-2.6.32-220.39.1.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm kernel-debug-devel-2.6.32-220.39.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-220.39.1.el6.ppc64.rpm kernel-devel-2.6.32-220.39.1.el6.ppc64.rpm kernel-headers-2.6.32-220.39.1.el6.ppc64.rpm perf-2.6.32-220.39.1.el6.ppc64.rpm perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm s390x: kernel-2.6.32-220.39.1.el6.s390x.rpm kernel-debug-2.6.32-220.39.1.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-220.39.1.el6.s390x.rpm kernel-debug-devel-2.6.32-220.39.1.el6.s390x.rpm kernel-debuginfo-2.6.32-220.39.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-220.39.1.el6.s390x.rpm kernel-devel-2.6.32-220.39.1.el6.s390x.rpm kernel-headers-2.6.32-220.39.1.el6.s390x.rpm kernel-kdump-2.6.32-220.39.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-220.39.1.el6.s390x.rpm kernel-kdump-devel-2.6.32-220.39.1.el6.s390x.rpm perf-2.6.32-220.39.1.el6.s390x.rpm perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm x86_64: kernel-2.6.32-220.39.1.el6.x86_64.rpm kernel-debug-2.6.32-220.39.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-220.39.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.39.1.el6.x86_64.rpm kernel-devel-2.6.32-220.39.1.el6.x86_64.rpm kernel-headers-2.6.32-220.39.1.el6.x86_64.rpm perf-2.6.32-220.39.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 6.2): Source: kernel-2.6.32-220.39.1.el6.src.rpm i386: kernel-debug-debuginfo-2.6.32-220.39.1.el6.i686.rpm kernel-debuginfo-2.6.32-220.39.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-220.39.1.el6.i686.rpm perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm python-perf-2.6.32-220.39.1.el6.i686.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.i686.rpm ppc64: kernel-debug-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-220.39.1.el6.ppc64.rpm perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm python-perf-2.6.32-220.39.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.ppc64.rpm s390x: kernel-debug-debuginfo-2.6.32-220.39.1.el6.s390x.rpm kernel-debuginfo-2.6.32-220.39.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-220.39.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-220.39.1.el6.s390x.rpm perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm python-perf-2.6.32-220.39.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-220.39.1.el6.s390x.rpm x86_64: kernel-debug-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.39.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.39.1.el6.x86_64.rpm python-perf-2.6.32-220.39.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.39.1.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 7. References: https://www.redhat.com/security/data/cve/CVE-2013-1773.html https://www.redhat.com/security/data/cve/CVE-2013-1796.html https://www.redhat.com/security/data/cve/CVE-2013-1797.html https://www.redhat.com/security/data/cve/CVE-2013-1798.html https://www.redhat.com/security/data/cve/CVE-2013-1848.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_Technical_Notes/kernel.html 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2013 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFR3E+wXlSAg2UNWIIRAlIsAJ4i2so/gitsklPV/HmSFQcls86qJgCfbrcv PXzhDi6PdCtIEe2iINJrDHE= =U4TL - -----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. 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