rhsa-2014_0163
Vulnerability from csaf_redhat
Published
2014-02-12 18:23
Modified
2024-11-05 18:19
Summary
Red Hat Security Advisory: kvm security update

Notes

Topic
Updated kvm packages that fix two security issues are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
Details
KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM's Local Advanced Programmable Interrupt Controller (LAPIC) implementation. A privileged guest user could use this flaw to crash the host. (CVE-2013-6367) A memory corruption flaw was discovered in the way KVM handled virtual APIC accesses that crossed a page boundary. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2013-6368) Red Hat would like to thank Andrew Honig of Google for reporting these issues. All kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. Note: the procedure in the Solution section must be performed before this update will take effect.
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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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Andrew Honig"
          ],
          "organization": "Google"
        }
      ],
      "cve": "CVE-2013-6367",
      "discovery_date": "2013-11-15T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1032207"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The apic_get_tmcct function in arch/x86/kvm/lapic.c in the KVM subsystem in the Linux kernel through 3.12.5 allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via crafted modifications of the TMICT value.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kvm: division by zero in apic_get_tmcct()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise MRG 2 as they did not provide support for the KVM subsystem.",
          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2013-6367"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2013-6367",
          "url": "https://www.cve.org/CVERecord?id=CVE-2013-6367"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2013-6367",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-6367"
        }
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      "release_date": "2013-12-12T00:00:00+00:00",
      "remediations": [
        {
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          "date": "2014-02-12T18:23:00+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to use the\nRed Hat Network to apply this update are available at\nhttps://access.redhat.com/site/articles/11258\n\nThe following procedure must be performed before this update will take\neffect:\n\n1) Stop all KVM guest virtual machines.\n\n2) Either reboot the hypervisor machine or, as the root user, remove (using\n\"modprobe -r [module]\") and reload (using \"modprobe [module]\") all of the\nfollowing modules which are currently running (determined using \"lsmod\"):\nkvm, ksm, kvm-intel or kvm-amd.\n\n3) Restart the KVM guest virtual machines.",
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          "url": "https://access.redhat.com/errata/RHSA-2014:0163"
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      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "ADJACENT_NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 5.7,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:A/AC:M/Au:N/C:N/I:N/A:C",
            "version": "2.0"
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kvm: division by zero in apic_get_tmcct()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Andrew Honig"
          ],
          "organization": "Google"
        }
      ],
      "cve": "CVE-2013-6368",
      "discovery_date": "2013-11-15T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1032210"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The KVM subsystem in the Linux kernel through 3.12.5 allows local users to gain privileges or cause a denial of service (system crash) via a VAPIC synchronization operation involving a page-end address.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kvm: cross page vapic_addr access",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise MRG 2 as they did not provide support for the KVM subsystem.",
          "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": [
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          "5Server-VT-5.10.Z:kvm-tools-0:83-266.el5_10.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2013-6368"
        },
        {
          "category": "external",
          "summary": "RHBZ#1032210",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1032210"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2013-6368",
          "url": "https://www.cve.org/CVERecord?id=CVE-2013-6368"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2013-6368",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-6368"
        }
      ],
      "release_date": "2013-12-12T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2014-02-12T18:23:00+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to use the\nRed Hat Network to apply this update are available at\nhttps://access.redhat.com/site/articles/11258\n\nThe following procedure must be performed before this update will take\neffect:\n\n1) Stop all KVM guest virtual machines.\n\n2) Either reboot the hypervisor machine or, as the root user, remove (using\n\"modprobe -r [module]\") and reload (using \"modprobe [module]\") all of the\nfollowing modules which are currently running (determined using \"lsmod\"):\nkvm, ksm, kvm-intel or kvm-amd.\n\n3) Restart the KVM guest virtual machines.",
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          "cvss_v2": {
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            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.2,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:H/Au:N/C:C/I:C/A:C",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kvm: cross page vapic_addr access"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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