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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0150 Important: kernel security and bug fix update 10 February 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Enterprise Linux WS/Desktop 5 Red Hat Enterprise Linux Server 5 Linux variants Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2012-0207 CVE-2012-0028 CVE-2011-4127 CVE-2011-4086 CVE-2011-3638 Reference: ESB-2012.0065 ESB-2011.1279 ESB-2011.1206 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2012-0107.html Comment: This advisory references vulnerabilities in the Linux kernel that also affect distributions other than Red Hat. It is recommended that administrators running Linux check for an updated version of the kernel for their system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2012:0107-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0107.html Issue date: 2012-02-09 CVE Names: CVE-2011-3638 CVE-2011-4086 CVE-2011-4127 CVE-2012-0028 CVE-2012-0207 ===================================================================== 1. Summary: Updated kernel packages that fix multiple security issues and two bugs are now available for Red Hat Enterprise Linux 5. 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 (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, 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: * Using the SG_IO ioctl to issue SCSI requests to partitions or LVM volumes resulted in the requests being passed to the underlying block device. If a privileged user only had access to a single partition or LVM volume, they could use this flaw to bypass those restrictions and gain read and write access (and be able to issue other SCSI commands) to the entire block device. Refer to Red Hat Knowledgebase article DOC-67874, linked to in the References, for further details about this issue. (CVE-2011-4127, Important) * A flaw was found in the way the Linux kernel handled robust list pointers of user-space held futexes across exec() calls. A local, unprivileged user could use this flaw to cause a denial of service or, eventually, escalate their privileges. (CVE-2012-0028, Important) * A flaw was found in the Linux kernel in the way splitting two extents in ext4_ext_convert_to_initialized() worked. A local, unprivileged user with the ability to mount and unmount ext4 file systems could use this flaw to cause a denial of service. (CVE-2011-3638, Moderate) * A flaw was found in the way the Linux kernel's journal_unmap_buffer() function handled buffer head states. On systems that have an ext4 file system with a journal mounted, a local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-4086, Moderate) * A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query() function. An attacker able to send certain IGMP (Internet Group Management Protocol) packets to a target system could use this flaw to cause a denial of service. (CVE-2012-0207, Moderate) Red Hat would like to thank Zheng Liu for reporting CVE-2011-3638, and Simon McVittie for reporting CVE-2012-0207. This update also fixes the following bugs: * When a host was in recovery mode and a SCSI scan operation was initiated, the scan operation failed and provided no error output. This bug has been fixed and the SCSI layer now waits for recovery of the host to complete scan operations for devices. (BZ#772162) * SG_IO ioctls were not implemented correctly in the Red Hat Enterprise Linux 5 virtio-blk driver. Sending an SG_IO ioctl request to a virtio-blk disk caused the sending thread to enter an uninterruptible sleep state ("D" state). With this update, SG_IO ioctls are rejected by the virtio-blk driver: the ioctl system call will simply return an ENOTTY ("Inappropriate ioctl for device") error and the thread will continue normally. (BZ#773322) 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/kb/docs/DOC-11259 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/): 747942 - CVE-2011-3638 kernel: ext4: ext4_ext_insert_extent() kernel oops 749143 - CVE-2011-4086 kernel: jbd2: unmapped buffer with _Unwritten or _Delay flags set can lead to DoS 752375 - CVE-2011-4127 kernel: possible privilege escalation via SG_IO ioctl 771764 - CVE-2012-0028 kernel: futex: clear robust_list on execve 772867 - CVE-2012-0207 kernel: igmp: Avoid zero delay when receiving odd mixture of IGMP queries 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kernel-2.6.18-274.18.1.el5.src.rpm i386: kernel-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-devel-2.6.18-274.18.1.el5.i686.rpm kernel-debug-2.6.18-274.18.1.el5.i686.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-debug-devel-2.6.18-274.18.1.el5.i686.rpm kernel-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.i686.rpm kernel-devel-2.6.18-274.18.1.el5.i686.rpm kernel-headers-2.6.18-274.18.1.el5.i386.rpm kernel-xen-2.6.18-274.18.1.el5.i686.rpm kernel-xen-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-xen-devel-2.6.18-274.18.1.el5.i686.rpm noarch: kernel-doc-2.6.18-274.18.1.el5.noarch.rpm x86_64: kernel-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-devel-2.6.18-274.18.1.el5.x86_64.rpm kernel-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.x86_64.rpm kernel-devel-2.6.18-274.18.1.el5.x86_64.rpm kernel-headers-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-devel-2.6.18-274.18.1.el5.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-274.18.1.el5.src.rpm i386: kernel-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-PAE-devel-2.6.18-274.18.1.el5.i686.rpm kernel-debug-2.6.18-274.18.1.el5.i686.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-debug-devel-2.6.18-274.18.1.el5.i686.rpm kernel-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.i686.rpm kernel-devel-2.6.18-274.18.1.el5.i686.rpm kernel-headers-2.6.18-274.18.1.el5.i386.rpm kernel-xen-2.6.18-274.18.1.el5.i686.rpm kernel-xen-debuginfo-2.6.18-274.18.1.el5.i686.rpm kernel-xen-devel-2.6.18-274.18.1.el5.i686.rpm ia64: kernel-2.6.18-274.18.1.el5.ia64.rpm kernel-debug-2.6.18-274.18.1.el5.ia64.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.ia64.rpm kernel-debug-devel-2.6.18-274.18.1.el5.ia64.rpm kernel-debuginfo-2.6.18-274.18.1.el5.ia64.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.ia64.rpm kernel-devel-2.6.18-274.18.1.el5.ia64.rpm kernel-headers-2.6.18-274.18.1.el5.ia64.rpm kernel-xen-2.6.18-274.18.1.el5.ia64.rpm kernel-xen-debuginfo-2.6.18-274.18.1.el5.ia64.rpm kernel-xen-devel-2.6.18-274.18.1.el5.ia64.rpm noarch: kernel-doc-2.6.18-274.18.1.el5.noarch.rpm ppc: kernel-2.6.18-274.18.1.el5.ppc64.rpm kernel-debug-2.6.18-274.18.1.el5.ppc64.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.ppc64.rpm kernel-debug-devel-2.6.18-274.18.1.el5.ppc64.rpm kernel-debuginfo-2.6.18-274.18.1.el5.ppc64.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.ppc64.rpm kernel-devel-2.6.18-274.18.1.el5.ppc64.rpm kernel-headers-2.6.18-274.18.1.el5.ppc.rpm kernel-headers-2.6.18-274.18.1.el5.ppc64.rpm kernel-kdump-2.6.18-274.18.1.el5.ppc64.rpm kernel-kdump-debuginfo-2.6.18-274.18.1.el5.ppc64.rpm kernel-kdump-devel-2.6.18-274.18.1.el5.ppc64.rpm s390x: kernel-2.6.18-274.18.1.el5.s390x.rpm kernel-debug-2.6.18-274.18.1.el5.s390x.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.s390x.rpm kernel-debug-devel-2.6.18-274.18.1.el5.s390x.rpm kernel-debuginfo-2.6.18-274.18.1.el5.s390x.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.s390x.rpm kernel-devel-2.6.18-274.18.1.el5.s390x.rpm kernel-headers-2.6.18-274.18.1.el5.s390x.rpm kernel-kdump-2.6.18-274.18.1.el5.s390x.rpm kernel-kdump-debuginfo-2.6.18-274.18.1.el5.s390x.rpm kernel-kdump-devel-2.6.18-274.18.1.el5.s390x.rpm x86_64: kernel-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-debug-devel-2.6.18-274.18.1.el5.x86_64.rpm kernel-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-debuginfo-common-2.6.18-274.18.1.el5.x86_64.rpm kernel-devel-2.6.18-274.18.1.el5.x86_64.rpm kernel-headers-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-debuginfo-2.6.18-274.18.1.el5.x86_64.rpm kernel-xen-devel-2.6.18-274.18.1.el5.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-2011-3638.html https://www.redhat.com/security/data/cve/CVE-2011-4086.html https://www.redhat.com/security/data/cve/CVE-2011-4127.html https://www.redhat.com/security/data/cve/CVE-2012-0028.html https://www.redhat.com/security/data/cve/CVE-2012-0207.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/kb/docs/DOC-67874 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) iD8DBQFPM/ifXlSAg2UNWIIRAjj/AJ4iEIz4M5bBrWcuoLxFTqO5bur7AwCePivb hjyRG2XpmZoDMmhhOtx8Ww0= =5hL4 - -----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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