ID

VAR-201808-0958

CVE

CVE-2018-3620

TITLE

Intel processors are vulnerable to a speculative execution side-channel attack called L1 Terminal Fault (L1TF)

DESCRIPTION

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access via a terminal page fault and a side-channel analysis. These attacks are known as L1 Terminal Fault: SGX, L1 Terminal Fault: OS/SMM, and L1 Terminal Fault: VMM. Intel Core i3 processor, etc. are all CPU (central processing unit) products of Intel Corporation of the United States. The following products are affected: Intel Core i3 processor; Intel Core i5 processor; Intel Core i7 processor; Intel Core M processor family; 2nd generation Intel Core processors; 3rd generation Intel Core processors; 4th generation Intel Core processors; 5th generation Intel Core processors, etc. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. (CVE-2018-5391) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.13.0-155-generic 3.13.0-155.205 linux-image-3.13.0-155-generic-lpae 3.13.0-155.205 linux-image-3.13.0-155-lowlatency 3.13.0-155.205 linux-image-3.13.0-155-powerpc-e500 3.13.0-155.205 linux-image-3.13.0-155-powerpc-e500mc 3.13.0-155.205 linux-image-3.13.0-155-powerpc-smp 3.13.0-155.205 linux-image-3.13.0-155-powerpc64-emb 3.13.0-155.205 linux-image-3.13.0-155-powerpc64-smp 3.13.0-155.205 linux-image-generic 3.13.0.155.165 linux-image-generic-lpae 3.13.0.155.165 linux-image-lowlatency 3.13.0.155.165 linux-image-powerpc-e500 3.13.0.155.165 linux-image-powerpc-e500mc 3.13.0.155.165 linux-image-powerpc-smp 3.13.0.155.165 linux-image-powerpc64-emb 3.13.0.155.165 linux-image-powerpc64-smp 3.13.0.155.165 Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2390-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2390 Issue date: 2018-08-14 CVE Names: CVE-2017-0861 CVE-2017-15265 CVE-2018-3620 CVE-2018-3646 CVE-2018-3693 CVE-2018-7566 CVE-2018-10901 CVE-2018-1000004 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6. 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: Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-3620, CVE-2018-3646) * An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3693) * kernel: kvm: vmx: host GDT limit corruption (CVE-2018-10901) * kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation (CVE-2017-0861) * kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265) * kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566) * kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646; Vladimir Kiriansky (MIT) and Carl Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693; and Vegard Nossum (Oracle Corporation) for reporting CVE-2018-10901. Bug Fix(es): * The Least recently used (LRU) operations are batched by caching pages in per-cpu page vectors to prevent contention of the heavily used lru_lock spinlock. The page vectors can hold even the compound pages. Previously, the page vectors were cleared only if they were full. Subsequently, the amount of memory held in page vectors, which is not reclaimable, was sometimes too high. Consequently the page reclamation started the Out of Memory (OOM) killing processes. With this update, the underlying source code has been fixed to clear LRU page vectors each time when a compound page is added to them. As a result, OOM killing processes due to high amounts of memory held in page vectors no longer occur. (BZ#1575819) 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/): 1501878 - CVE-2017-15265 kernel: Use-after-free in snd_seq_ioctl_create_port() 1535315 - CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service 1550142 - CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access 1563994 - CVE-2017-0861 kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege escalation 1581650 - CVE-2018-3693 Kernel: speculative bounds check bypass store 1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF) 1601849 - CVE-2018-10901 kernel: kvm: vmx: host GDT limit corruption 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: kernel-2.6.32-754.3.5.el6.src.rpm i386: kernel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-devel-2.6.32-754.3.5.el6.i686.rpm kernel-headers-2.6.32-754.3.5.el6.i686.rpm perf-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm noarch: kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm kernel-doc-2.6.32-754.3.5.el6.noarch.rpm kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm x86_64: kernel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm kernel-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-headers-2.6.32-754.3.5.el6.x86_64.rpm perf-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux Desktop Optional (v. 6): i386: kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm x86_64: kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: kernel-2.6.32-754.3.5.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm kernel-doc-2.6.32-754.3.5.el6.noarch.rpm kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm x86_64: kernel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm kernel-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-headers-2.6.32-754.3.5.el6.x86_64.rpm perf-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux HPC Node Optional (v. 6): x86_64: kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: kernel-2.6.32-754.3.5.el6.src.rpm i386: kernel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-devel-2.6.32-754.3.5.el6.i686.rpm kernel-headers-2.6.32-754.3.5.el6.i686.rpm perf-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm noarch: kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm kernel-doc-2.6.32-754.3.5.el6.noarch.rpm kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm ppc64: kernel-2.6.32-754.3.5.el6.ppc64.rpm kernel-bootwrapper-2.6.32-754.3.5.el6.ppc64.rpm kernel-debug-2.6.32-754.3.5.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm kernel-debug-devel-2.6.32-754.3.5.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.3.5.el6.ppc64.rpm kernel-devel-2.6.32-754.3.5.el6.ppc64.rpm kernel-headers-2.6.32-754.3.5.el6.ppc64.rpm perf-2.6.32-754.3.5.el6.ppc64.rpm perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm s390x: kernel-2.6.32-754.3.5.el6.s390x.rpm kernel-debug-2.6.32-754.3.5.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.s390x.rpm kernel-debug-devel-2.6.32-754.3.5.el6.s390x.rpm kernel-debuginfo-2.6.32-754.3.5.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.3.5.el6.s390x.rpm kernel-devel-2.6.32-754.3.5.el6.s390x.rpm kernel-headers-2.6.32-754.3.5.el6.s390x.rpm kernel-kdump-2.6.32-754.3.5.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.3.5.el6.s390x.rpm kernel-kdump-devel-2.6.32-754.3.5.el6.s390x.rpm perf-2.6.32-754.3.5.el6.s390x.rpm perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm x86_64: kernel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm kernel-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-headers-2.6.32-754.3.5.el6.x86_64.rpm perf-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 6): i386: kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm ppc64: kernel-debug-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.3.5.el6.ppc64.rpm perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm python-perf-2.6.32-754.3.5.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.ppc64.rpm s390x: kernel-debug-debuginfo-2.6.32-754.3.5.el6.s390x.rpm kernel-debuginfo-2.6.32-754.3.5.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.3.5.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.3.5.el6.s390x.rpm perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm python-perf-2.6.32-754.3.5.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.s390x.rpm x86_64: kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: kernel-2.6.32-754.3.5.el6.src.rpm i386: kernel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-devel-2.6.32-754.3.5.el6.i686.rpm kernel-headers-2.6.32-754.3.5.el6.i686.rpm perf-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm noarch: kernel-abi-whitelists-2.6.32-754.3.5.el6.noarch.rpm kernel-doc-2.6.32-754.3.5.el6.noarch.rpm kernel-firmware-2.6.32-754.3.5.el6.noarch.rpm x86_64: kernel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.3.5.el6.i686.rpm kernel-debug-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm kernel-devel-2.6.32-754.3.5.el6.x86_64.rpm kernel-headers-2.6.32-754.3.5.el6.x86_64.rpm perf-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 6): i386: kernel-debug-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-2.6.32-754.3.5.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.3.5.el6.i686.rpm perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm python-perf-2.6.32-754.3.5.el6.i686.rpm python-perf-debuginfo-2.6.32-754.3.5.el6.i686.rpm x86_64: kernel-debug-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.3.5.el6.x86_64.rpm perf-debuginfo-2.6.32-754.3.5.el6.x86_64.rpm python-perf-2.6.32-754.3.5.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.3.5.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/ 7. References: https://access.redhat.com/security/cve/CVE-2017-0861 https://access.redhat.com/security/cve/CVE-2017-15265 https://access.redhat.com/security/cve/CVE-2018-3620 https://access.redhat.com/security/cve/CVE-2018-3646 https://access.redhat.com/security/cve/CVE-2018-3693 https://access.redhat.com/security/cve/CVE-2018-7566 https://access.redhat.com/security/cve/CVE-2018-10901 https://access.redhat.com/security/cve/CVE-2018-1000004 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/L1TF 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW3Me0NzjgjWX9erEAQhkDBAAjGcoEad9NOtCUJqgDcVHLArXg9OKAloW +BaoAYrYtzH3h9teocV6U3mYaxhwu2Cd13JlbKJsc8BLRzHUSZpwxjcsewCzjx2u dotwAksPej7L3U/U5YPSJ37r/OP+ni7trT1dtEmCI578QHFZB6+4/qK/1aYM+biQ EI0BoaSMV6RDo9u+U6zPgk8L7ugMhWs2PCXbtV7koyg563tasvo5jWlfVYNVD1fz cKTzsTwVQwirynWa2mvtaI+vaslYX3x9Zn6dJ2VEzpD4w6tU54/sViaetmLnSOir ZVdtkeO0pdEBO2YUr+Igc+ZOtLdGpzOjkQVQMBG+YE6bDdynYYFrxkPcNPeB1f1K 2bTNHA/FnirFDOII3JuYEqg8TXdh8NYRZ4a8rqchGo2JCeh5Q5LnhJDYWJv2HbTW TZUQY/nStRfWVpygQJV72GJENICnRVjjQ5D569KFBopnK0iXWLpxlf3dmp5Lvdg2 0rBVnnclfQCQVxZvOiZ3s0wkA9d0o7v4pDN2YgTRDlU4nzI3xE4jh0Sevsn4tVco ePUubCuxhjQfxJswBPoZA8Al3GGlSxOMKFHO6HscnnAh6YL5LVusx4PpJt4Y3tjW Vf8Rk4bFbn+M0RtVM+vnFGjWAr7w6iKvRya8y0LzElfAtpeedcnuxfJGtecT73IZ /6fv2MlabwY=kAUc -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . Corrected: 2018-08-14 17:51:12 UTC (stable/11, 11.1-STABLE) 2018-08-15 02:30:11 UTC (releng/11.2, 11.2-RELEASE-p2) 2018-08-15 02:30:11 UTC (releng/11.1, 11.1-RELEASE-p13) CVE Name: CVE-2018-3620, CVE-2018-3646 Special Note: Speculative execution vulnerability mitigation remains a work in progress. This advisory addresses the issue in FreeBSD 11.1 and later. For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. Background When a program accesses data in memory via a logical address it is translated to a physical address in RAM by the CPU. Accessing an unmapped logical address results in what is known as a terminal fault. II. The CPU may speculatively access the level 1 data cache (L1D). Data which would otherwise be protected may then be determined by using side channel methods. This issue affects bhyve on FreeBSD/amd64 systems. III. Impact An attacker executing user code, or kernel code inside of a virtual machine, may be able to read secret data from the kernel or from another virtual machine. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. Perform one of the following: 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +30 "Rebooting for security update" 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 11.2] # fetch https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.2.patch # fetch https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.2.patch.asc # gpg --verify l1tf-11.2.patch.asc [FreeBSD 11.1] # fetch https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.1.patch # fetch https://security.FreeBSD.org/patches/SA-18:09/l1tf-11.1.patch.asc # gpg --verify l1tf-11.1.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details CVE-2018-3620 (L1 Terminal Fault-OS) - ------------------------------------ FreeBSD reserves the the memory page at physical address 0, so it will not contain secret data. FreeBSD zeros the paging data structures for unmapped addresses, so that speculatively executed L1 Terminal Faults will access only the reserved, unused page. The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/11/ r337794 releng/11.1/ r337828 releng/11.2/ r337828 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. ========================================================================== Kernel Live Patch Security Notice 0044-1 October 05, 2018 linux vulnerability ========================================================================== A security issue affects these releases of Ubuntu: | Series | Base kernel | Arch | flavors | |------------------+--------------+----------+------------------| | Ubuntu 14.04 LTS | 4.4.0 | amd64 | generic | | Ubuntu 14.04 LTS | 4.4.0 | amd64 | lowlatency | | Ubuntu 16.04 LTS | 4.15.0 | amd64 | generic | | Ubuntu 16.04 LTS | 4.15.0 | amd64 | lowlatency | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency | Summary: Several security issues were fixed in the kernel. Note that due to a client issue, this livepatch may report that it failed to load. You can verify that the patch has successfully loaded by looking in /sys/kernel/livepatch for a directory starting with the name "lkp_Ubuntu," followed by your kernel version, and ending with the version number, "44." The next client update should correct this problem. (CVE-2018-3620) It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. (CVE-2018-15594) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-6555) It was discovered that a stack-based buffer overflow existed in the iSCSI target implementation of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash). An attacker could use this to expose sensitive information. (CVE-2018-15572) Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2018-17182) Update instructions: The problem can be corrected by updating your livepatches to the following versions: | Kernel | Version | flavors | |--------------------------+----------+--------------------------| | 4.4.0-133.159 | 44.1 | generic, lowlatency | | 4.4.0-133.159~14.04.1 | 44.1 | lowlatency, generic | | 4.4.0-134.160 | 44.1 | generic, lowlatency | | 4.4.0-134.160~14.04.1 | 44.1 | lowlatency, generic | | 4.4.0-135.161~14.04.1 | 44.1 | lowlatency, generic | | 4.15.0-32.35 | 44.1 | lowlatency, generic | | 4.15.0-32.35~16.04.1 | 44.1 | generic, lowlatency | | 4.15.0-33.36 | 44.1 | lowlatency, generic | | 4.15.0-33.36~16.04.1 | 44.1 | lowlatency, generic | | 4.15.0-34.37 | 44.1 | generic, lowlatency | | 4.15.0-34.37~16.04.1 | 44.2 | lowlatency, generic | References: CVE-2018-3620, CVE-2018-15594, CVE-2018-3646, CVE-2018-6555, CVE-2018-14633, CVE-2018-15572, CVE-2018-17182 -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . These CVEs are security vulnerabilities caused by flaws in the design of speculative execution hardware in the computer's CPU. Details on the vulnerability and our response can be found here: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF Due to the high complexity of the fixes and the need for a corresponding CPU microcode update for a complete fix, we are unable to livepatch these CVEs. Please plan to reboot into an updated kernel as soon as possible. References: CVE-2018-3620, and CVE-2018-3646 -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. 6.5) - x86_64 3

AFFECTED PRODUCTS