09 August 2017
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1969 Important: kernel-rt security and bug fix update 9 August 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Linux kernel 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-2017-2647 CVE-2016-10200 CVE-2015-8970 Reference: ESB-2017.1890 ESB-2017.1872 ESB-2017.1223 ESB-2017.0468 Original Bulletin: https://access.redhat.com/errata/RHSA-2017:2444 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2017:2444-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://access.redhat.com/errata/RHSA-2017:2444 Issue date: 2017-08-08 CVE Names: CVE-2015-8970 CVE-2016-10200 CVE-2017-2647 ===================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise MRG 2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) 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 provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * A use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system. (CVE-2016-10200, Important) * A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges. (CVE-2017-2647, Important) * The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5 allows local users to cause a system crash and a denial of service by the NULL pointer dereference via accept(2) system call for AF_ALG socket without calling setkey() first to set a cipher key. (CVE-2015-8970, Moderate) Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin (Virtuozzo) for reporting CVE-2017-2647 and Igor Redko (Virtuozzo) and Vasily Averin (Virtuozzo) for reporting CVE-2015-8970. Bug Fix(es): * Writing model-specific register (MSR) registers during intel_idle initialization could previously cause exceptions. Consequently, a kernel panic occurred during this initialization. The function call to write to the MSR with exception handling was modified to use wrmsrl_safe() instead of wrmsrl(). In this scenario, the kernel no longer panics. (BZ#1447438) * The ixgbe driver was using incorrect bitwise operations on received PTP flags. Consequently, systems that were using the ixgbe driver could not synchronize time using PTP. The provided patch corrected the bitwise operations on received PTP flags allowing these system to correctly synchronize time using PTP. (BZ#1469795) (BZ#1451821) The kernel-rt packages have been upgraded to version 3.10.0-514.rt56.230, which provides a number of security and bug fixes over the previous version. (BZ#1463427) 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. 5. Bugs fixed (https://bugzilla.redhat.com/): 1386286 - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref 1428353 - CVE-2017-2647 kernel: Null pointer dereference in search_keyring 1430347 - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature 1437675 - ftrace: pull upstream commits for correct selftest operation 1463427 - update the MRG 2.5.z 3.10 kernel-rt sources 6. Package List: MRG Realtime for RHEL 6 Server v.2: Source: kernel-rt-3.10.0-514.rt56.231.el6rt.src.rpm noarch: kernel-rt-doc-3.10.0-514.rt56.231.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-514.rt56.231.el6rt.noarch.rpm x86_64: kernel-rt-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-514.rt56.231.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-2015-8970 https://access.redhat.com/security/cve/CVE-2016-10200 https://access.redhat.com/security/cve/CVE-2017-2647 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <email@example.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZigpyXlSAg2UNWIIRAv6jAJ9QivZ8t/TXeI7sSp1QSGG0d7jiYgCglBfw cNTyyGFDpkLQ7TeQZ1O9TcY= =wU+d - -----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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