rhsa-2018_1711
Vulnerability from csaf_redhat
Published
2018-05-23 16:00
Modified
2024-11-15 03:05
Summary
Red Hat Security Advisory: rhev-hypervisor7 security update

Notes

Topic
An update for rhev-hypervisor7 is now available for RHEV 3.X Hypervisor and Agents Extended Lifecycle Support for Red Hat Enterprise Linux 6 and RHEV 3.X Hypervisor and Agents Extended Lifecycle Support for Red Hat Enterprise Linux 7. 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 rhev-hypervisor7 package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: A subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent. Security Fix(es): * 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) Note: This is the rhev-hypervisor7 side of the CVE-2018-3639 mitigation. Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.
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 rhev-hypervisor7 is now available for RHEV 3.X Hypervisor and Agents Extended Lifecycle Support for Red Hat Enterprise Linux 6 and RHEV 3.X Hypervisor and Agents Extended Lifecycle Support for Red Hat Enterprise Linux 7.\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": "A flaw was found in the way the Linux kernel\u0027s KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.",
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          "text": "This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG 2.\n\nThis issue affects the version of the kernel package as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue.",
          "title": "Statement"
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        {
          "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.",
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        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/pop_ss",
          "url": "https://access.redhat.com/security/vulnerabilities/pop_ss"
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      ],
      "release_date": "2018-05-08T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-05-23T16:00:52+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",
          "product_ids": [
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          "cvss_v3": {
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            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "details": "Important"
        }
      ],
      "title": "Kernel: KVM: error in exception handling leads to wrong debug stack value"
    },
    {
      "acknowledgments": [
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          "names": [
            "Jann Horn"
          ],
          "organization": "Google Project Zero"
        },
        {
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          "organization": "Microsoft Security Response Center"
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      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "discovery_date": "2018-03-12T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "1566890"
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          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "hw: cpu: speculative store bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ssbd",
          "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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      ],
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          "url": "https://www.cve.org/CVERecord?id=CVE-2018-3639"
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-3639"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/ssbd",
          "url": "https://access.redhat.com/security/vulnerabilities/ssbd"
        },
        {
          "category": "external",
          "summary": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528",
          "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528"
        },
        {
          "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"
        }
      ],
      "release_date": "2018-05-21T21:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2018-05-23T16:00:52+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",
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          "cvss_v3": {
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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",
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          },
          "products": [
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.noarch",
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.src",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.noarch",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "hw: cpu: speculative store bypass"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Andy Lutomirski"
          ]
        },
        {
          "names": [
            "Nick Peterson"
          ],
          "organization": "Everdox Tech LLC"
        }
      ],
      "cve": "CVE-2018-8897",
      "cwe": {
        "id": "CWE-250",
        "name": "Execution with Unnecessary Privileges"
      },
      "discovery_date": "2018-03-20T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1567074"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way the Linux kernel handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged system user could use this flaw to crash the system kernel resulting in the denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Kernel: error in exception handling leads to DoS",
          "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": {
        "fixed": [
          "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.noarch",
          "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.src",
          "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.noarch",
          "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.src"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-8897"
        },
        {
          "category": "external",
          "summary": "RHBZ#1567074",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1567074"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-8897",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-8897"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-8897",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-8897"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/pop_ss",
          "url": "https://access.redhat.com/security/vulnerabilities/pop_ss"
        }
      ],
      "release_date": "2018-05-08T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-05-23T16:00:52+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",
          "product_ids": [
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.noarch",
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.src",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.noarch",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2018:1711"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          },
          "products": [
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.noarch",
            "6Server-RHEV-Hypervisor-ELS:rhev-hypervisor7-0:7.3-20180521.1.el6ev.src",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.noarch",
            "7Server-RHEV-Hypervisor-ELS-7:rhev-hypervisor7-0:7.3-20180521.1.el7ev.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "Kernel: error in exception handling leads to DoS"
    }
  ]
}


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