ID

VAR-201801-1711

CVE

CVE-2017-5754

TITLE

CPU hardware utilizing speculative execution may be vulnerable to cache side-channel attacks

DESCRIPTION

Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis of the data cache. Two vulnerabilities are identified, known as "Variant 3a" and "Variant 4". CPUhardware is a set of firmware that runs in the CPU (Central Processing Unit) for managing and controlling the CPU. The Spectre vulnerability exists in the CPU processor core. Because Intel does not separate low-privileged applications from accessing kernel memory, an attacker can use a malicious application to obtain private data that should be quarantined. Intel and ARM CPU chips have an information disclosure vulnerability, which originates from a flaw in the processor data boundary mechanism. The following products and versions are affected: ARM Cortex-A75; Intel Xeon E5-1650 v3, v2, v4; Xeon E3-1265l v2, v3, v4; Xeon E3-1245 v2, v3, v5, v6; Xeon X7542 wait. Relevant releases/architectures: Image Updates for RHV-H - noarch 3. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Unfortunately, that update introduced a regression where a few systems failed to boot successfully. This update fixes the problem. We apologize for the inconvenience. This specific attack has been named Meltdown and is addressed in the Linux kernel for the Intel x86-64 architecture by a patch set named Kernel Page Table Isolation, enforcing a near complete separation of the kernel and userspace address maps and preventing the attack. This solution might have a performance impact, and can be disabled at boot time by passing `pti=off' to the kernel command line. We also identified a regression for ancient userspaces using the vsyscall interface, for example chroot and containers using (e)glibc 2.13 and older, including those based on Debian 7 or RHEL/CentOS 6. The other vulnerabilities (named Spectre) published at the same time are not addressed in this update and will be fixed in a later update. For the stable distribution (stretch), this problem has been fixed in version 4.9.65-3+deb9u2. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux 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----- iQEzBAEBCgAdFiEE8vi34Qgfo83x35gF3rYcyPpXRFsFAlpOqZMACgkQ3rYcyPpX RFuTTQf/btBqg9/I3XlnJFyGAmd4eQolTcU5cfDJqNhD4TZoyMocghvw1kYtu7z9 bYVhwCRukJym8O8AXJOxvlcsP7g0ANXqVDHpzCN8byKYgzigVP9brfOu/zDa4uYY EYf8V3pc2QzNo5OV4G+sK5ZklkDnNIde+OxUfU0Otl9fUG2rS5JTFvaRgvGazlbb cN5wltoHD6DBeSRnfadwYPHQR5U+KAJNImh34Y6T73i7n5dGTnNhs6E7n0wlJL9O SQLwoqQeiDpcE7C4TZ1pb4AbFCZXaic+1ONbWy8D7erKNA7kV1U2LQDmPDw9kmua Lc5heEX026Xfdy83v6NAPwR+NU8stg== =GGyG -----END PGP SIGNATURE----- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Note: the current version of the following document is available here: https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-hpesbhf03805en_us SUPPORT COMMUNICATION - SECURITY BULLETIN Document ID: hpesbhf03805en_us Version: 4 HPESBHF03805 rev.4 - Certain HPE products using Microprocessors from Intel, AMD, and ARM, with Speculative Execution, Elevation of Privilege and Information Disclosure. NOTICE: The information in this Security Bulletin should be acted upon as soon as possible. Release Date: 2018-01-10 Last Updated: 2018-01-09 Potential Security Impact: Local: Disclosure of Information, Elevation of Privilege Source: Hewlett Packard Enterprise, Product Security Response Team VULNERABILITY SUMMARY On January 3 2018, side-channel security vulnerabilities involving speculative execution were publicly disclosed. These vulnerabilities may impact the listed HPE products, potentially leading to information disclosure and elevation of privilege. Mitigation and resolution of these vulnerabilities may call for both an operating system update, provided by the OS vendor, and a system ROM update from HPE. **Note:** * This issue takes advantage of techniques commonly used in many modern processor architectures. * For further information, microprocessor vendors have provided security advisories: - Intel: <https://security-center.intel.com/advisory.aspx?intelid=intel-sa-00088&langu geid=en-fr> - AMD: <http://www.amd.com/en/corporate/speculative-execution> - ARM: <https://developer.arm.com/support/security-update> References: - PSRT110634 - PSRT110633 - PSRT110632 - CVE-2017-5715 - aka Spectre, branch target injection - CVE-2017-5753 - aka Spectre, bounds check bypass - CVE-2017-5754 - aka Meltdown, rogue data cache load, memory access permission check performed after kernel memory read SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. - HPE ProLiant DL380 Gen10 Server prior to v1.28 - HPE ProLiant DL180 Gen10 Server prior to v1.28 - HPE ProLiant DL160 Gen10 Server prior to v1.28 - HPE ProLiant DL360 Gen10 Server prior to v1.28 - HPE ProLiant ML110 Gen10 Server prior to v1.28 - HPE ProLiant DL580 Gen10 Server prior to v1.28 - HPE ProLiant DL560 Gen10 Server prior to v1.28 - HPE ProLiant DL120 Gen10 Server prior to v1.28 - HPE ProLiant ML350 Gen10 Server prior to v1.28 - HPE ProLiant XL450 Gen10 Server prior to v1.28 - HPE ProLiant XL170r Gen10 Server prior to v1.28 - HPE ProLiant BL460c Gen10 Server Blade prior to v1.28 - HPE ProLiant XL230a Gen9 Server prior to v2.54 - HPE ProLiant XL230k Gen10 Server prior to v1.28 - HPE ProLiant XL730f Gen9 Server prior to v2.54 - HPE ProLiant XL740f Gen9 Server prior to v2.54 - HPE ProLiant XL750f Gen9 Server prior to v2.54 - HPE ProLiant XL170r Gen9 Server prior to v2.54 - HP ProLiant DL60 Gen9 Server prior to v2.54 - HPE ProLiant XL450 Gen9 Server prior to v2.54 - HP ProLiant DL160 Gen9 Server prior to v2.54 - HPE Apollo 4200 Gen9 Server prior to v2.54 - HP ProLiant BL460c Gen9 Server Blade prior to v2.54 - HP ProLiant ML110 Gen9 Server prior to v2.54 - HP ProLiant ML150 Gen9 Server prior to v2.54 - HPE ProLiant ML350 Gen9 Server prior to v2.54 - HP ProLiant DL380 Gen9 Server prior to v2.54 - HP ProLiant DL120 Gen9 Server prior to v2.54 - HPE ProLiant DL560 Gen9 Server prior to v2.54 - HPE ProLiant XL270d Gen9 Special Server prior to v2.54 - HP ProLiant BL660c Gen9 Server prior to v2.54 - HPE ProLiant m710x Server Cartridge prior to v1.60 - HPE ProLiant DL20 Gen9 Server prior to v2.52 - HPE ProLiant DL385 Gen10 Server prior to v1.04 - HPE Synergy 660 Gen9 Compute Module prior to v2.54 - HPE Synergy 480 Gen10 Compute Module prior to v1.28 - HPE Synergy 480 Gen9 Compute Module prior to v2.54 - HPE ProLiant ML30 Gen9 Server prior to v2.52 - HPE ProLiant XL190r Gen10 Server prior to v1.28 - HPE ProLiant XL250a Gen9 Server prior to v2.54 - HPE ProLiant XL190r Gen9 Server prior to v2.54 - HP ProLiant DL80 Gen9 Server prior to v2.54 - HPE ProLiant DL180 Gen9 Server prior to v2.54 - HPE ProLiant XL270d Gen9 Accelerator Tray 2U Configure-to-order Server prior to v2.54 - HPE ProLiant WS460c Gen9 Workstation prior to v2.54 - HPE ProLiant DL580 Gen9 Special Server prior to v2.54 - HPE Synergy 680 Gen9 Compute Modules prior to v2.54 - HPE ProLiant XL260a Gen9 Server prior to 1/22/2018 - HPE ProLiant m510 Server Cartridge prior to 1/22/2018 - HPE ProLiant m710p Server Cartridge prior to 12/12/2017 - HP ProLiant m350 Server Cartridge prior to 12/12/2017 - HP ProLiant m300 Server Cartridge prior to 12/12/2017 - HP ProLiant ML350e Gen8 Server prior to 12/12/2017 - HPE ProLiant ML350e Gen8 v2 Server prior to 12/12/2017 - HP ProLiant BL460c Gen8 Server prior to 12/12/2017 - HP ProLiant BL660c Gen8 Server prior to 12/12/2017 - HPE ProLiant SL4540 Gen8 1 Node Server prior to 12/12/2017 - HP ProLiant DL380e Gen8 Server prior to 12/12/2017 - HP ProLiant DL360e Gen8 Server prior to 12/12/2017 - HP ProLiant ML350p Gen8 Server prior to 12/12/2017 - HP ProLiant DL360p Gen8 Server prior to 12/12/2017 - HP ProLiant DL380p Gen8 Server prior to 12/12/2017 - HP ProLiant DL320e Gen8 Server prior to 12/12/2017 - HPE ProLiant DL320e Gen8 v2 Server prior to 12/12/2017 - HP ProLiant ML310e Gen8 Server prior to 12/12/2017 - HPE ProLiant ML310e Gen8 v2 Server prior to 12/12/2017 - HP ProLiant DL160 Gen8 Server prior to 12/12/2017 - HP ProLiant SL270s Gen8 Server prior to 12/12/2017 - HP ProLiant SL250s Gen8 Server prior to 12/12/2017 - HP ProLiant SL230s Gen8 Server prior to 12/12/2017 - HP ProLiant DL560 Gen8 Server prior to 12/12/2017 - HPE ProLiant SL210t Gen8 Server prior to 12/12/2017 - HP ProLiant DL580 Gen8 Server prior to 12/12/2017 (v1.98) - HP ProLiant ML10 Server prior to 12/12/2017 - HP ProLiant m710 Server Cartridge prior to 12/12/2017 (v1.60) - HPE Synergy Composer prior to 12/12/2017 - HPE Integrity Superdome X with BL920s Blades prior to 8.8.6 - HPE Superdome Flex Server prior to 2.3.110 - HP ProLiant DL360 Gen9 Server prior to v2.54 - HPE Synergy 620 Gen9 Compute Module prior to v2.54 - HPE ProLiant Thin Micro TM200 Server prior to 1/16/2017 - HPE ProLiant ML350 Gen10 Server prior to v1.28 - HP ProLiant BL420c Gen8 Server prior to 12/12/2017 - HPE ProLiant ML10 v2 Server prior to 12/12/2017 - HPE ProLiant MicroServer Gen8 prior to 12/12/2017 - HPE Synergy 660 Gen10 Compute Module prior to v1.28 BACKGROUND CVSS Base Metrics ================= Reference, CVSS V3 Score/Vector, CVSS V2 Score/Vector CVE-2017-5715 8.2 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N 6.8 (AV:A/AC:L/Au:N/C:C/I:P/A:N) CVE-2017-5753 5.0 CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L 5.4 (AV:A/AC:M/Au:N/C:P/I:P/A:P) CVE-2017-5754 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 7.8 (AV:N/AC:L/Au:N/C:C/I:N/A:N) Information on CVSS is documented in HPE Customer Notice HPSN-2008-002 here: https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01345499 RESOLUTION HPE has made the following system ROM updates which include an updated microcode to resolve the vulnerability: * HPE has provided a customer bulletin <https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-a00039267en_us> with specific instructions to obtain the udpated sytem ROM - Note: + CVE-2017-5715 requires that the System ROM be updated and a vendor supplied operating system update be applied as well. + For CVE-2017-5753, CVE-2017-5754 require only updates of a vendor supplied operating system. + HPE will continue to add additional products to the list. Not all listed products have updated system ROMs yet. Impacted products awaiting system ROM updates are marked TBS (to be supplied). HISTORY Version:1 (rev.1) - 4 January 2018 Initial release Version:2 (rev.2) - 5 January 2018 Added additional impacted products Version:3 (rev.3) - 10 January 2018 Added more impacted products Version:4 (rev.4) - 9 January 2018 Fixed product ID Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy. Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hpe.com. Report: To report a potential security vulnerability for any HPE supported product: Web form: https://www.hpe.com/info/report-security-vulnerability Email: security-alert@hpe.com Subscribe: To initiate a subscription to receive future HPE Security Bulletin alerts via Email: http://www.hpe.com/support/Subscriber_Choice Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://www.hpe.com/support/Security_Bulletin_Archive Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB. 3C = 3COM 3P = 3rd Party Software GN = HPE General Software HF = HPE Hardware and Firmware MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PV = ProCurve ST = Storage Software UX = HP-UX Copyright 2016 Hewlett Packard Enterprise Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett Packard Enterprise and the names of Hewlett Packard Enterprise products referenced herein are trademarks of Hewlett Packard Enterprise in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-18:03.speculative_execution Security Advisory The FreeBSD Project Topic: Speculative Execution Vulnerabilities Category: core Module: kernel Announced: 2018-03-14 Credits: Jann Horn (Google Project Zero); Werner Haas, Thomas Prescher (Cyberus Technology); Daniel Gruss, Moritz Lipp, Stefan Mangard, Michael Schwarz (Graz University of Technology); Paul Kocher; Daniel Genkin (University of Pennsylvania and University of Maryland), Mike Hamburg (Rambus); Yuval Yarom (University of Adelaide and Data6) Affects: All supported versions of FreeBSD. Corrected: 2018-02-17 18:00:01 UTC (stable/11, 11.1-STABLE) 2018-03-14 04:00:00 UTC (releng/11.1, 11.1-RELEASE-p8) CVE Name: CVE-2017-5715, CVE-2017-5754 Special Note: Speculative execution vulnerability mitigation is a work in progress. This advisory addresses the most significant issues for FreeBSD 11.1 on amd64 CPUs. We expect to update this advisory to include 10.x for amd64 CPUs. Future FreeBSD releases will address this issue on i386 and other CPUs. freebsd-update will include changes on i386 as part of this update due to common code changes shared between amd64 and i386, however it contains no functional changes for i386 (in particular, it does not mitigate the issue on i386). 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/>. I. II. Problem Description A number of issues relating to speculative execution were found last year and publicly announced January 3rd. Two of these, known as Meltdown and Spectre V2, are addressed here. CVE-2017-5754 (Meltdown) - ------------------------ This issue relies on an affected CPU speculatively executing instructions beyond a faulting instruction. When this happens, changes to architectural state are not committed, but observable changes may be left in micro- architectural state (for example, cache). This may be used to infer privileged data. CVE-2017-5715 (Spectre V2) - -------------------------- Spectre V2 uses branch target injection to speculatively execute kernel code at an address under the control of an attacker. 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. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. 2) 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, followed by a reboot into the new kernel: # freebsd-update fetch # freebsd-update install # shutdown -r now 3) 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 11.1] # fetch https://security.FreeBSD.org/patches/SA-18:03/speculative_execution-amd64-11.patch # fetch https://security.FreeBSD.org/patches/SA-18:03/speculative_execution-amd64-11.patch.asc # gpg --verify speculative_execution-amd64-11.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-2017-5754 (Meltdown) - ------------------------ The mitigation is known as Page Table Isolation (PTI). PTI largely separates kernel and user mode page tables, so that even during speculative execution most of the kernel's data is unmapped and not accessible. A positive result is definitive (that is, the vulnerability exists with certainty). A negative result indicates either that the CPU is not affected, or that the test is not capable of demonstrating the issue on the CPU (and may need to be modified). A patched kernel will automatically enable PTI on Intel CPUs. The status can be checked via the vm.pmap.pti sysctl: # sysctl vm.pmap.pti vm.pmap.pti: 1 The default setting can be overridden by setting the loader tunable vm.pmap.pti to 1 or 0 in /boot/loader.conf. This setting takes effect only at boot. PTI introduces a performance regression. The observed performance loss is significant in microbenchmarks of system call overhead, but is much smaller for many real workloads. CVE-2017-5715 (Spectre V2) - -------------------------- There are two common mitigations for Spectre V2. This patch includes a mitigation using Indirect Branch Restricted Speculation, a feature available via a microcode update from processor manufacturers. The alternate mitigation, Retpoline, is a feature available in newer compilers. The feasibility of applying Retpoline to stable branches and/or releases is under investigation. The patch includes the IBRS mitigation for Spectre V2. To use the mitigation the system must have an updated microcode; with older microcode a patched kernel will function without the mitigation. IBRS can be disabled via the hw.ibrs_disable sysctl (and tunable), and the status can be checked via the hw.ibrs_active sysctl. IBRS may be enabled or disabled at runtime. Additional detail on microcode updates will follow. The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/11/ r329462 releng/11.1/ r330908 - ------------------------------------------------------------------------- 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. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:03.speculative_execution.asc> -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAlqon0RfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKORw/+Lc5lxLhDgU1rQ0JF6sb2b80Ly5k+rJLXFWBvmEQt0uVyVkF4TMJ99M04 bcmrLbT4Pl0Csh/iEYvZQ4el12KvPDApHszsLTBgChD+KfCLvCZvBZzasgDWGD0E JhL4eIX0wjJ4oGGsT+TAqkmwXyAMJgWW/ZgZPFVXocylZTL3fV4g52VdG1Jnd2yu hnkViH2kVlVJqXX9AHlenIUfEmUiRUGrMh5oPPpFYDDmfJ+enZ8QLxfZtOKIliD7 u+2GP8V/bvaErkxqF5wwobybrBOMXpq9Y/fWw0EH/om7myevj/oORqK+ZmGZ17bl IRbdWxgjc1hN2TIMVn9q9xX6i0I0wSPwbpLYagKnSnE8WNVUTZUteaj1GKGTG1rj DFH2zOLlbRr/IXUFldM9b6VbZX6G5Ijxwy1DJzB/0KL5ZTbAReUR0pqHR7xpulbJ eDv8SKCwYiUpMuwPOXNdVlVLZSsH5/9A0cyjH3+E+eIhM8qyxw7iRFwA0DxnGVkr tkMo51Vl3Gl7JFFimGKljsE9mBh00m8B0WYJwknvfhdehO4WripcwI7/V5zL6cwj s018kaW4Xm77LOz6P1iN8nbcjZ9gN2AsPYUYYZqJxjCcZ7r489Hg9BhbDf0QtC0R gnwZWiZ/KuAy0C6vaHljsm0xPEM5nBz/yScFXDbuhEdmEgBBD6w= =fqrI -----END PGP SIGNATURE----- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2018:0018-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:0018 Issue date: 2018-01-04 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support. 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. Relevant releases/architectures: Red Hat Enterprise Linux Server AUS (v. 6.4) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64 3. Security Fix(es): An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Variant CVE-2017-5753 triggers the speculative execution by performing a bounds-check bypass. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall boundary and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5753, Important) Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5715, Important) Variant CVE-2017-5754 relies on the fact that, on impacted microprocessors, during speculative execution of instruction permission faults, exception generation triggered by a faulting access is suppressed until the retirement of the whole instruction block. In a combination with the fact that memory accesses may populate the cache even when the block is being dropped and never committed (executed), an unprivileged local attacker could use this flaw to read privileged (kernel space) memory by conducting targeted cache side-channel attacks. (CVE-2017-5754, Important) Note: CVE-2017-5754 affects Intel x86-64 microprocessors. AMD x86-64 microprocessors are not affected by this issue. Red Hat would like to thank Google Project Zero for reporting these issues. 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. Bugs fixed (https://bugzilla.redhat.com/): 1519778 - CVE-2017-5753 hw: cpu: speculative execution bounds-check bypass 1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection 1519781 - CVE-2017-5754 hw: cpu: speculative execution permission faults handling 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.84.2.el6.src.rpm noarch: kernel-doc-2.6.32-358.84.2.el6.noarch.rpm kernel-firmware-2.6.32-358.84.2.el6.noarch.rpm x86_64: kernel-2.6.32-358.84.2.el6.x86_64.rpm kernel-debug-2.6.32-358.84.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.84.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.84.2.el6.x86_64.rpm kernel-devel-2.6.32-358.84.2.el6.x86_64.rpm kernel-headers-2.6.32-358.84.2.el6.x86_64.rpm perf-2.6.32-358.84.2.el6.x86_64.rpm perf-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.84.2.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.84.2.el6.x86_64.rpm perf-debuginfo-2.6.32-358.84.2.el6.x86_64.rpm python-perf-2.6.32-358.84.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.84.2.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. 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. On i386 and amd64 architectures, the IBRS and IBPB features are required to enable the kernel mitigations. Ubuntu is working with Intel and AMD to provide future microcode updates that implement IBRS and IBPB as they are made available. Ubuntu users with a processor from a different vendor should contact the vendor to identify necessary firmware updates. Ubuntu will provide corresponding QEMU updates in the future for users of self-hosted virtual environments in coordination with upstream QEMU. Ubuntu users in cloud environments should contact the cloud provider to confirm that the hypervisor has been updated to expose the new CPU features to virtual machines. ========================================================================== Ubuntu Security Notice USN-3583-1 February 23, 2018 linux vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel Details: It was discovered that an out-of-bounds write vulnerability existed in the Flash-Friendly File System (f2fs) in the Linux kernel. An attacker could construct a malicious file system that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-0750) It was discovered that a race condition leading to a use-after-free vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-0861) It was discovered that the KVM implementation in the Linux kernel allowed passthrough of the diagnostic I/O port 0x80. An attacker in a guest VM could use this to cause a denial of service (system crash) in the host OS. (CVE-2017-1000407) Bo Zhang discovered that the netlink wireless configuration interface in the Linux kernel did not properly validate attributes when handling certain requests. A local attacker with the CAP_NET_ADMIN could use this to cause a denial of service (system crash). (CVE-2017-12153) Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel did not properly track reference counts when merging buffers. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2017-12190) It was discovered that the key management subsystem in the Linux kernel did not properly restrict key reads on negatively instantiated keys. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-12192) It was discovered that an integer overflow existed in the sysfs interface for the QLogic 24xx+ series SCSI driver in the Linux kernel. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2017-14051) Otto Ebeling discovered that the memory manager in the Linux kernel did not properly check the effective UID in some situations. A local attacker could use this to expose sensitive information. (CVE-2017-14140) It was discovered that the ATI Radeon framebuffer driver in the Linux kernel did not properly initialize a data structure returned to user space. (CVE-2017-14156) ChunYu Wang discovered that the iSCSI transport implementation in the Linux kernel did not properly validate data structures. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-14489) James Patrick-Evans discovered a race condition in the LEGO USB Infrared Tower driver in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15102) ChunYu Wang discovered that a use-after-free vulnerability existed in the SCTP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code, (CVE-2017-15115) It was discovered that the key management subsystem in the Linux kernel did not properly handle NULL payloads with non-zero length values. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-15274) It was discovered that the Bluebooth Network Encapsulation Protocol (BNEP) implementation in the Linux kernel did not validate the type of socket passed in the BNEPCONNADD ioctl(). A local attacker with the CAP_NET_ADMIN privilege could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15868) Andrey Konovalov discovered a use-after-free vulnerability in the USB serial console driver in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16525) It was discovered that the netfilter passive OS fingerprinting (xt_osf) module did not properly perform access control checks. A local attacker could improperly modify the systemwide OS fingerprint list. (CVE-2017-17450) It was discovered that the HMAC implementation did not validate the state of the underlying cryptographic hash algorithm. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-17806) Denys Fedoryshchenko discovered a use-after-free vulnerability in the netfilter xt_TCPMSS filter of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash). (CVE-2017-18017) Gareth Evans discovered that the shm IPC subsystem in the Linux kernel did not properly restrict mapping page zero. A local privileged attacker could use this to execute arbitrary code. (CVE-2017-5669) It was discovered that an integer overflow vulnerability existing in the IPv6 implementation in the Linux kernel. A local attacker could use this to cause a denial of service (infinite loop). (CVE-2017-7542) Tommi Rantala and Brad Spengler discovered that the memory manager in the Linux kernel did not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism. A local attacker with access to /dev/mem could use this to expose sensitive information or possibly execute arbitrary code. (CVE-2017-7889) Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-8824) Mohamed Ghannam discovered a null pointer dereference in the RDS (Reliable Datagram Sockets) protocol implementation of the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-5333) ee3/4ePS discovered that a race condition existed in loop block device implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-5344) USN-3524-1 mitigated CVE-2017-5754 (Meltdown) for the amd64 architecture in Ubuntu 14.04 LTS. This update provides the corresponding mitigations for the ppc64el architecture. This flaw is known as Meltdown. (CVE-2017-5754) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.13.0-142-generic 3.13.0-142.191 linux-image-3.13.0-142-generic-lpae 3.13.0-142.191 linux-image-3.13.0-142-lowlatency 3.13.0-142.191 linux-image-3.13.0-142-powerpc-e500 3.13.0-142.191 linux-image-3.13.0-142-powerpc-e500mc 3.13.0-142.191 linux-image-3.13.0-142-powerpc-smp 3.13.0-142.191 linux-image-3.13.0-142-powerpc64-emb 3.13.0-142.191 linux-image-3.13.0-142-powerpc64-smp 3.13.0-142.191 linux-image-generic 3.13.0.142.152 linux-image-generic-lpae 3.13.0.142.152 linux-image-lowlatency 3.13.0.142.152 linux-image-powerpc-e500 3.13.0.142.152 linux-image-powerpc-e500mc 3.13.0.142.152 linux-image-powerpc-smp 3.13.0.142.152 linux-image-powerpc64-emb 3.13.0.142.152 linux-image-powerpc64-smp 3.13.0.142.152 After a standard system update you need to reboot your computer to make all the necessary changes. 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. References: https://usn.ubuntu.com/usn/usn-3583-1 CVE-2017-0750, CVE-2017-0861, CVE-2017-1000407, CVE-2017-12153, CVE-2017-12190, CVE-2017-12192, CVE-2017-14051, CVE-2017-14140, CVE-2017-14156, CVE-2017-14489, CVE-2017-15102, CVE-2017-15115, CVE-2017-15274, CVE-2017-15868, CVE-2017-16525, CVE-2017-17450, CVE-2017-17806, CVE-2017-18017, CVE-2017-5669, CVE-2017-5754, CVE-2017-7542, CVE-2017-7889, CVE-2017-8824, CVE-2018-5333, CVE-2018-5344 Package Information: https://launchpad.net/ubuntu/+source/linux/3.13.0-142.191

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