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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.2275 Moderate: kernel-rt security, bug fix, and enhancement update 3 December 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel-rt Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 6 Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2014-7826 CVE-2014-7825 CVE-2014-7283 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2014-1943.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: kernel-rt security, bug fix, and enhancement update Advisory ID: RHSA-2014:1943-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1943.html Issue date: 2014-12-02 CVE Names: CVE-2014-7283 CVE-2014-7825 CVE-2014-7826 ===================================================================== 1. Summary: Updated kernel-rt packages that fix three security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise MRG 2.5. Red Hat Product Security has rated this update as having Moderate 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: MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64 3. Description: The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. A denial of service flaw was found in the way the Linux kernel's XFS file system implementation ordered directory hashes under certain conditions. A local attacker could use this flaw to corrupt the file system by creating directories with colliding hash values, potentially resulting in a system crash. (CVE-2014-7283, Moderate) An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's perf subsystem. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-7825, Moderate) An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's ftrace subsystem. On a system with ftrace syscall tracing enabled, a local, unprivileged user could use this flaw to crash the system, or escalate their privileges. (CVE-2014-7826, Moderate) Red Hat would like to thank Robert Å\x{154}wiÄ\x{153}cki for reporting CVE-2014-7825 and CVE-2014-7826. The kernel-rt packages have been upgraded to upstream version 3.10.58, which provides a number of bug fixes and enhancements over the previous version. (BZ#1158105) This update also fixes the following bugs: * Automatic NUMA balancing on a low priority thread could cause memory contention with a high priority thread running in the same process. This contention could trigger poor realtime performance on the system. In order to avoid this potential memory contention, the MRG Realtime kernel now disables NUMA_BALANCING_DEFAULT_ENABLED. (BZ#1158940) * When tracing a bug, WARN*() functions could flood the ring buffer making the trace useless or even overflowing the ring buffer. To address this issue, a traceoff_on_warning option was added to the kernel command line and as a sysctl option. This option disables the writing of the warning messages to the ring buffer, which results in a cleaner trace for debugging. (BZ#1155200) In addition, this update adds the following enhancement: * Support for XHCI (USB 3) is now enabled in the MRG Realtime kernel. (BZ#1134095) All kernel-rt users are advised to upgrade to these updated packages, which contain correct these issues and add these enhancements. 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/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 (https://bugzilla.redhat.com/): 1134095 - Enable XHCI (USB 3.0) for MRG 1148777 - CVE-2014-7283 kernel: xfs: directory hash ordering denial of service 1158105 - rebase to latest upstream stable 3.10 kernel 1161565 - CVE-2014-7825 CVE-2014-7826 kernel: insufficient syscall number validation in perf and ftrace subsystems 6. Package List: MRG Realtime for RHEL 6 Server v.2: Source: kernel-rt-3.10.58-rt62.58.el6rt.src.rpm noarch: kernel-rt-doc-3.10.58-rt62.58.el6rt.noarch.rpm kernel-rt-firmware-3.10.58-rt62.58.el6rt.noarch.rpm x86_64: kernel-rt-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-debug-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-devel-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-trace-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.58-rt62.58.el6rt.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/ 7. References: https://access.redhat.com/security/cve/CVE-2014-7283 https://access.redhat.com/security/cve/CVE-2014-7825 https://access.redhat.com/security/cve/CVE-2014-7826 https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2014 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFUffRPXlSAg2UNWIIRAqe7AKC9CEAg+zKYnWJcbaFAF3G/O07wtQCffLla kueIEqSB0ILMaDeikkM2dUo= =uxPB - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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). 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