rhsa-2018_2396
Vulnerability from csaf_redhat
Published
2018-08-14 20:17
Modified
2024-11-15 02:13
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise MRG 2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. 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 Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently 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 read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639) Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-693.37.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1599860)
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-rt is now available for Red Hat Enterprise MRG 2.\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.",
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        "text": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* 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)\n\n* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load \u0026 Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update 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 read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)\n\nRed Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639.\n\nBug Fix(es):\n\n* The kernel-rt packages have been upgraded to the 3.10.0-693.37.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1599860)",
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        },
        {
          "category": "external",
          "summary": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf",
          "url": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf"
        },
        {
          "category": "external",
          "summary": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf",
          "url": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf"
        },
        {
          "category": "external",
          "summary": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html",
          "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html"
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      ],
      "release_date": "2018-05-21T21:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
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          "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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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "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 store bypass"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Intel OSSIRT"
          ],
          "organization": "Intel.com"
        }
      ],
      "cve": "CVE-2018-3646",
      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "discovery_date": "2018-03-12T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1585005"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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 optimization) 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Kernel: hw: cpu: L1 terminal fault (L1TF)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 may address 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"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-3646"
        },
        {
          "category": "external",
          "summary": "RHBZ#1585005",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1585005"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-3646",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-3646"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-3646",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-3646"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/articles/3562741",
          "url": "https://access.redhat.com/articles/3562741"
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        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/L1TF",
          "url": "https://access.redhat.com/security/vulnerabilities/L1TF"
        },
        {
          "category": "external",
          "summary": "https://foreshadowattack.eu/",
          "url": "https://foreshadowattack.eu/"
        },
        {
          "category": "external",
          "summary": "https://software.intel.com/security-software-guidance/software-guidance/l1-terminal-fault",
          "url": "https://software.intel.com/security-software-guidance/software-guidance/l1-terminal-fault"
        },
        {
          "category": "external",
          "summary": "https://www.redhat.com/en/blog/deeper-look-l1-terminal-fault-aka-foreshadow",
          "url": "https://www.redhat.com/en/blog/deeper-look-l1-terminal-fault-aka-foreshadow"
        },
        {
          "category": "external",
          "summary": "https://www.redhat.com/en/blog/understanding-l1-terminal-fault-aka-foreshadow-what-you-need-know",
          "url": "https://www.redhat.com/en/blog/understanding-l1-terminal-fault-aka-foreshadow-what-you-need-know"
        }
      ],
      "release_date": "2018-08-14T17:00:00+00:00",
      "remediations": [
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          "date": "2018-08-14T20:17:22+00:00",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Kernel: hw: cpu: L1 terminal fault (L1TF)"
    }
  ]
}


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