rhsa-2018_1196
Vulnerability from csaf_redhat
Published
2018-04-23 12:59
Modified
2024-11-14 23:41
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
An update for kernel is now available for Red Hat Enterprise Linux 5 Extended Lifecycle 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. [Updated 4th September 2019] The Problem Description text has been updated to fix a list of architectures addressed by the CVE-2017-5715 mitigation. No changes have been made to the packages.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system. 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. 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, x86 and x86-64) Red Hat would like to thank Google Project Zero for reporting this issue. Bug Fix(es): * The Return Trampolines (Retpolines) mechanism is a software construct that leverages specific knowledge of the underlying hardware to mitigate the branch target injection, also known as Spectre variant 2 vulnerability described in CVE-2017-5715. With this update, the support for Retpolines has been implemented into the Red Hat Enterprise Linux kernel. (BZ#1535650)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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        "text": "An update for kernel is now available for Red Hat Enterprise Linux 5 Extended Lifecycle Support.\n\nRed 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.\n\n[Updated 4th September 2019]\nThe Problem Description text has been updated to fix a list of architectures addressed by the CVE-2017-5715 mitigation. No changes have been made to the packages.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* 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. 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\u0027s 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, x86 and x86-64)\n\nRed Hat would like to thank Google Project Zero for reporting this issue.\n\nBug Fix(es):\n\n* The Return Trampolines (Retpolines) mechanism is a software construct that leverages specific knowledge of the underlying hardware to mitigate the branch target injection, also known as Spectre variant 2 vulnerability described in CVE-2017-5715. With this update, the support for Retpolines has been implemented into the Red Hat Enterprise Linux kernel. (BZ#1535650)",
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      "cve": "CVE-2017-5715",
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      "ids": [
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          "text": "1519780"
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          "category": "description",
          "text": "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. 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\u0027s 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: cpu: speculative execution branch target injection",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Please see the Vulnerability Response article for the full list of updates available and a detailed discussion of this issue.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2017-5715"
        },
        {
          "category": "external",
          "summary": "RHBZ#1519780",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1519780"
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          "category": "external",
          "summary": "RHSB-speculativeexecution",
          "url": "https://access.redhat.com/security/vulnerabilities/speculativeexecution"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2017-5715",
          "url": "https://www.cve.org/CVERecord?id=CVE-2017-5715"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-5715",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-5715"
        },
        {
          "category": "external",
          "summary": "https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html",
          "url": "https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html"
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        {
          "category": "external",
          "summary": "https://meltdownattack.com",
          "url": "https://meltdownattack.com"
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        {
          "category": "external",
          "summary": "https://spectreattack.com/",
          "url": "https://spectreattack.com/"
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      "release_date": "2018-01-03T22:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2018-04-23T12:59:43+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.0"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "hw: cpu: speculative execution branch target injection"
    }
  ]
}


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