ID

VAR-201905-0709

CVE

CVE-2018-12126

TITLE

Microarchitectural Store Buffer Data Sampling Vulnerable to information disclosure

DESCRIPTION

Microarchitectural Store Buffer Data Sampling (MSBDS): Store buffers on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. A list of impacted products can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-update-guidance_05132019.pdf. Intel Xeon Scalable Processors and so on are products of Intel Corporation of the United States. Intel XeonScalable Processors is a scalable server central processing unit (CPU). IntelXeonProcessorE7v4Family is a XeonE7 series server central processing unit (CPU). IntelXeonProcessorE5v4Family is a XeonE5 series server central processing unit (CPU). An information disclosure vulnerability exists in several Intel products. The vulnerability stems from errors in the configuration of the network system or product during operation. An unauthorized attacker can exploit the vulnerability to obtain sensitive information about the affected component. The following products and versions are affected: Intel Xeon Scalable Processors; Xeon Processor E7 v4 Family; Xeon Processor E5 v4 Family; Xeon Processor E3 v6 Family; Xeon Processor E3 v4 Family; Xeon Processor E; Xeon E Processor; Xeon D Processor; Puma; Pentium Processor Silver Series; Pentium Processor N Series; Pentium Processor J Series; Pentium Gold Processor Series; Mobile Communications Platforms; Microcode; Core X series Processors; Celeron Processor N Series; Celeron Processor J Series; Celeron Processor G Series; Atom Processor X Series ;Atom Processor E3900 Series;Atom Processor E3800 Series;Atom Processor. Description: The VDSM service is required by a Virtualization Manager to manage the Linux hosts. VDSM manages and monitors the host's storage, memory and networks as well as virtual machine creation, other host administration tasks, statistics gathering, and log collection. 8) - aarch64, noarch, ppc64le, s390x, x86_64 3. Description: Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. (CVE-2019-11091) * QEMU: device_tree: heap buffer overflow while loading device tree blob (CVE-2018-20815) * libssh2: Integer overflow in transport read resulting in out of bounds write (CVE-2019-3855) * libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write (CVE-2019-3856) * libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write (CVE-2019-3857) * libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes (CVE-2019-3863) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ========================================================================== Ubuntu Security Notice USN-3979-1 May 14, 2019 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 19.04 Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-raspi2: Linux kernel for Raspberry Pi 2 Details: Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa Milburn, Sebastian \xd6sterlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss discovered that memory previously stored in microarchitectural fill buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. (CVE-2018-12130) Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan van Schaik, Alyssa Milburn, Sebastian \xd6sterlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory previously stored in microarchitectural load ports of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. (CVE-2018-12127) Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory previously stored in microarchitectural store buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. (CVE-2018-12126) Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur, Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa Milburn, Sebastian \xd6sterlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida discovered that uncacheable memory previously stored in microarchitectural buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. (CVE-2019-11091) It was discovered that the IPv4 generic receive offload (GRO) for UDP implementation in the Linux kernel did not properly handle padded packets. A remote attacker could use this to cause a denial of service (system crash). (CVE-2019-11683) It was discovered that a race condition existed in the Binder IPC driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-1999) Matteo Croce, Natale Vinto, and Andrea Spagnolo discovered that the cgroups subsystem of the Linux kernel did not properly account for SCTP socket buffers. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-3874) Alex Williamson discovered that the vfio subsystem of the Linux kernel did not properly limit DMA mappings. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-3882) Marc Orr discovered that the KVM hypervisor implementation in the Linux kernel did not properly restrict APIC MSR register values when nested virtualization is used. An attacker in a guest vm could use this to cause a denial of service (host OS crash). (CVE-2019-3887) Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux kernel contained a head puffer overflow. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-9500) Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux kernel did not properly prevent remote firmware events from being processed for USB Wifi devices. A physically proximate attacker could use this to send firmware events to the device. (CVE-2019-9503) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: linux-image-5.0.0-1006-aws 5.0.0-1006.6 linux-image-5.0.0-1006-azure 5.0.0-1006.6 linux-image-5.0.0-1006-gcp 5.0.0-1006.6 linux-image-5.0.0-1006-kvm 5.0.0-1006.6 linux-image-5.0.0-1008-raspi2 5.0.0-1008.8 linux-image-5.0.0-15-generic 5.0.0-15.16 linux-image-5.0.0-15-generic-lpae 5.0.0-15.16 linux-image-5.0.0-15-lowlatency 5.0.0-15.16 linux-image-aws 5.0.0.1006.6 linux-image-azure 5.0.0.1006.6 linux-image-gcp 5.0.0.1006.6 linux-image-generic 5.0.0.15.16 linux-image-generic-lpae 5.0.0.15.16 linux-image-gke 5.0.0.1006.6 linux-image-kvm 5.0.0.1006.6 linux-image-lowlatency 5.0.0.15.16 linux-image-raspi2 5.0.0.1008.5 linux-image-virtual 5.0.0.15.16 After a standard system update you need to reboot your computer to make all the necessary changes. Please note that fully mitigating the Microarchitectural Data Sampling (MDS) issues (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and CVE-2019-11091) requires corresponding processor microcode/firmware updates or, in virtual environments, hypervisor updates. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: libvirt security update Advisory ID: RHSA-2019:1186-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1186 Issue date: 2019-05-14 CVE Names: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091 ===================================================================== 1. Summary: An update for libvirt is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions. 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 Server AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server E4S (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.2) - x86_64 3. Description: The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems. Security Fix(es): * A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer. (CVE-2018-12130) * Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed processor structure called the 'processor store buffer'. As a result, an unprivileged attacker could use this flaw to read private data resident within the CPU's processor store buffer. (CVE-2018-12126) * Microprocessors use a ‘load port’ subcomponent to perform load operations from memory or IO. During a load operation, the load port receives data from the memory or IO subsystem and then provides the data to the CPU registers and operations in the CPU’s pipelines. Stale load operations results are stored in the 'load port' table until overwritten by newer operations. Certain load-port operations triggered by an attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a timing side-channel. (CVE-2019-11091) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 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 After installing the updated packages, libvirtd will be restarted automatically. 5. Package List: Red Hat Enterprise Linux Server AUS (v. 7.2): Source: libvirt-1.2.17-13.el7_2.10.src.rpm x86_64: libvirt-1.2.17-13.el7_2.10.x86_64.rpm libvirt-client-1.2.17-13.el7_2.10.i686.rpm libvirt-client-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-interface-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nodedev-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-qemu-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-secret-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-storage-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-kvm-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.i686.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-devel-1.2.17-13.el7_2.10.i686.rpm libvirt-devel-1.2.17-13.el7_2.10.x86_64.rpm libvirt-docs-1.2.17-13.el7_2.10.x86_64.rpm Red Hat Enterprise Linux Server E4S (v. 7.2): Source: libvirt-1.2.17-13.el7_2.10.src.rpm x86_64: libvirt-1.2.17-13.el7_2.10.x86_64.rpm libvirt-client-1.2.17-13.el7_2.10.i686.rpm libvirt-client-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-interface-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nodedev-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-qemu-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-secret-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-storage-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-kvm-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.i686.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-devel-1.2.17-13.el7_2.10.i686.rpm libvirt-devel-1.2.17-13.el7_2.10.x86_64.rpm libvirt-docs-1.2.17-13.el7_2.10.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 7.2): Source: libvirt-1.2.17-13.el7_2.10.src.rpm x86_64: libvirt-1.2.17-13.el7_2.10.x86_64.rpm libvirt-client-1.2.17-13.el7_2.10.i686.rpm libvirt-client-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-config-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-interface-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-network-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nodedev-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-nwfilter-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-qemu-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-secret-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-driver-storage-1.2.17-13.el7_2.10.x86_64.rpm libvirt-daemon-kvm-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.i686.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-devel-1.2.17-13.el7_2.10.i686.rpm libvirt-devel-1.2.17-13.el7_2.10.x86_64.rpm libvirt-docs-1.2.17-13.el7_2.10.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.2): x86_64: libvirt-daemon-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-lock-sanlock-1.2.17-13.el7_2.10.x86_64.rpm libvirt-login-shell-1.2.17-13.el7_2.10.x86_64.rpm Red Hat Enterprise Linux Server Optional E4S (v. 7.2): x86_64: libvirt-daemon-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-lock-sanlock-1.2.17-13.el7_2.10.x86_64.rpm libvirt-login-shell-1.2.17-13.el7_2.10.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 7.2): x86_64: libvirt-daemon-lxc-1.2.17-13.el7_2.10.x86_64.rpm libvirt-debuginfo-1.2.17-13.el7_2.10.x86_64.rpm libvirt-lock-sanlock-1.2.17-13.el7_2.10.x86_64.rpm libvirt-login-shell-1.2.17-13.el7_2.10.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-2018-12126 https://access.redhat.com/security/cve/CVE-2018-12127 https://access.redhat.com/security/cve/CVE-2018-12130 https://access.redhat.com/security/cve/CVE-2019-11091 https://access.redhat.com/security/vulnerabilities/mds https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2019 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBXNspY9zjgjWX9erEAQhYSQ/+IUAyZl0LnpfmMs2b4cWyhab2xcuwg0vH vwW0ba3+TmjGHt+fwMEAaA4/sSnEbquIbJbCu8fx4KHz3Z9bS+Bz203+EYoAkX6W 47MphBHQYJSRKXk2J1IYNMFRD/zCuAXMU5C0wZ2M8a28TTVEXh7qnz1iPbvQsc2U vDEptwBjGTuqtYg7c4n2Q0wEIrlOx9cWrBPupbVYvTLQEjXD1HNTdKd76p2xvV43 p2uP0rrEypU8Isq44/3l9jkZipjx6AoVAxdTaCJ1hpXTNb8UblnGiDTY03kdAdvH ALSG99xmBSOymJ0XMw0t4I0LVhKRcdM/Z+xvIKhfu2TTJzCC5yFWIVYXISDGTbJj vz8M3KfcFwZF+PZZTurd1koLRTvw99l9vtNxwOEyoFaCueOEjW3nd4q8RZKdvpbV 4ZidTKtbRTNGpAZ2mz7O5EIDBB0N6g23bU5BW8Mzc5jeyJBpMJb+qPXhKXh4iMmi 5ySGrAeuUoOMR7Aa+S5dq6o7lu8wiMhiYlrxQjNLH1iCN6geHi7iiCMuR6PN+Hn2 tprWi2lNFlSgf2VFTewiy7cJYMJ8P5O77TpSfWJasxN+MD+bjt4Oc0ywTCA32m1a Gsk+5KntQlVDT1QbuJWvV/02/+khz7Oxq3yIDWlJePrRRufknyOJXTADDcsiUAG7 LXhfb/N/qQY= =W0lI -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. It provides mitigations for the MSBDS, MFBDS, MLPDS and MDSUM hardware vulnerabilities. To fully resolve these vulnerabilities it is also necessary to update the Linux kernel packages as released in DSA 4444. For the stable distribution (stretch), these problems have been fixed in version 3.20190514.1~deb9u1. We recommend that you upgrade your intel-microcode packages. For the detailed security status of intel-microcode please refer to its security tracker page at: https://security-tracker.debian.org/tracker/intel-microcode Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEtuYvPRKsOElcDakFEMKTtsN8TjYFAlzb2WsACgkQEMKTtsN8 TjZ+PBAAqVaw+/6ZsLEwj4aPlI0XrDP1MEWLHSFyOpOluNKaHSfCR1MopjdmSykT 91es+HCLISwbpuhPy8a+rPEZnSwnQczuXJITMVnW0Z9noUvTf/BnN/dAdwTa8Ka8 DkhBnvmc5gOkdcG7il+PaI1byZ5/6S+znqhDiN4VSZg3h1LhJMk9h9kUjQS+W6uC qA4JGdJsqeQShngE8njGetwCaf29+e2OQ3RfuDp+6XgsQln2ZOi7r69Bj5VmH5jB yYzMMp8n0jMKelzqP9HtniL/P/75foDhQrP95k8gFaeRaLTEIb0NNLP1JpiaVKtn +c+1yMN6R7JG86AOlNOq/xUHv3pkuP9i2PBEga/956nQZf9g9/5tc6/K0dgHl4Yx zn1SKQrKdXVqtvYx6boh3cPqoJ99W32GijQHr2N8ezjdmW7SHMGtpnSVO88nDbH4 JVdxVhtY4JCsDJxYIwb6T4p3TSGIzN0T7y5/YqItqObmblLpg8jASWNkrepH3jqY a9swwMelQTsop5LFTwgYbTznXSEE+AorFTc+hOvScR4ZSr8kPVK/nf/m+h5Zj68B Lx/nnOQZFYySrNBKMfMLCXmrmMWP3ZavMiiEJL4GbWfNFAEJH4P+2UwsjwyEVW3h NrRAdm0MqsY86tHBWmDGhNMYjShKm/vG5mMpWg5r3AG3IhG1x/U= =PWZK -----END PGP SIGNATURE----- . Affects: All supported versions of FreeBSD. Corrected: 2019-05-14 17:04:00 UTC (stable/12, 12.0-STABLE) 2019-05-14 23:19:08 UTC (releng/12.0, 12.0-RELEASE-p4) 2019-05-14 17:05:02 UTC (stable/11, 11.3-PRERELEASE) 2019-05-14 23:20:16 UTC (releng/11.2, 11.2-RELEASE-p10) CVE Name: CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091 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 Modern processors make use of speculative execution, an optimization technique which performs some action in advance of knowing whether the result will actually be used. II. III. Impact An attacker may be able to read secret data from the kernel or from a process when executing untrusted code (for example, in a web browser). IV. Workaround No workaround is available. Systems with users or processors in different trust domains should disable Hyper-Threading by setting the machdep.hyperthreading_allowed tunable to 0: # echo 'machdep.hyperthreading_allowed=0 >> /boot/loader.conf' # shutdown V. Solution Perform one of the following: Update CPU microcode, upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, evaluate mitigation and Hyper Threading controls, and reboot the system. New CPU microcode may be available in a BIOS update from your system vendor, or by installing the devcpu-data package or sysutils/devcpu-data port. Ensure that the BIOS update or devcpu-data package is dated after 2014-05-14. If using the package or port the microcode update can be applied at boot time by adding the following lines to the system's /boot/loader.conf: cpu_microcode_load="YES" cpu_microcode_name="/boot/firmware/intel-ucode.bin" Microcode updates can also be applied while the system is running. See cpucontrol(8) for details. 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 Follow additional details under "Mitigation Configuration" below. 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 12.0-STABLE] # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.12-stable.patch # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.12-stable.patch.asc # gpg --verify mds.12-stable.patch.asc [FreeBSD 12.0-RELEASE] # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.12.0.patch # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.12.0.patch.asc # gpg --verify mds.12.0.patch.asc [FreeBSD 11.3-PRERELEASE] # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.11-stable.patch # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.11-stable.patch.asc # gpg --verify mds.11-stable.patch.asc [FreeBSD 11.2-RELEASE] # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.11.2.patch # fetch https://security.FreeBSD.org/patches/SA-19:07/mds.11.2.patch.asc # gpg --verify mds.11.2.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>. Mitigation Configuration Systems with users, processes, or virtual machines in different trust domains should disable Hyper-Threading by setting the machdep.hyperthreading_allowed tunable to 0: # echo machdep.hyperthreading_allowed=0 >> /boot/loader.conf To activate the MDS mitigation set the hw.mds_disable sysctl. The settings are: 0 - mitigation disabled 1 - VERW instruction (microcode) mitigation enabled 2 - Software sequence mitigation enabled (not recommended) 3 - Automatic VERW or Software selection Automatic mode uses the VERW instruction if supported by the CPU / microcode, or software sequences if not. To enable automatic mode at boot: # echo hw.mds_disable=3 >> /etc/sysctl.conf Reboot the system: # shutdown -r +10min "Security update" Check the mitigation status: # sysctl hw.mds_disable_state hw.mds_disable_state: software Silvermont VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/12/ r347567 releng/12.0/ r346594 stable/11/ r347568 releng/11.2/ r347595 - ------------------------------------------------------------------------- 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

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

overflow

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-02-22T23:12:30.773000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE