rhsa-2012_0149
Vulnerability from csaf_redhat
Published
2012-02-21 02:20
Modified
2024-11-22 05:24
Summary
Red Hat Security Advisory: kvm security and bug fix update

Notes

Topic
Updated kvm packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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. It was found that the kvm_vm_ioctl_assign_device() function in the KVM subsystem of a Linux kernel did not check if the user requesting device assignment was privileged or not. A member of the kvm group on the host could assign unused PCI devices, or even devices that were in use and whose resources were not properly claimed by the respective drivers, which could result in the host crashing. (CVE-2011-4347) Red Hat would like to thank Sasha Levin for reporting this issue. These updated kvm packages include several bug fixes. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the References, for information on the most significant of these changes. All KVM users should 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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        "text": "Updated kvm packages that fix one security issue and several bugs are now\navailable for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having moderate\nsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available from the CVE link in\nthe References section.",
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        "text": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for\nthe standard Red Hat Enterprise Linux kernel.\n\nIt was found that the kvm_vm_ioctl_assign_device() function in the KVM\nsubsystem of a Linux kernel did not check if the user requesting device\nassignment was privileged or not. A member of the kvm group on the host\ncould assign unused PCI devices, or even devices that were in use and\nwhose resources were not properly claimed by the respective drivers, which\ncould result in the host crashing. (CVE-2011-4347)\n\nRed Hat would like to thank Sasha Levin for reporting this issue.\n\nThese updated kvm packages include several bug fixes. Space precludes\ndocumenting all of these changes in this advisory. Users are directed to\nthe Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the\nReferences, for information on the most significant of these changes.\n\nAll KVM users should upgrade to these updated packages, which contain\nbackported patches to correct these issues. Note: The procedure in the\nSolution section must be performed before this update will take effect.",
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  "vulnerabilities": [
    {
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      "cve": "CVE-2011-4347",
      "discovery_date": "2011-11-20T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "756084"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The kvm_vm_ioctl_assign_device function in virt/kvm/assigned-dev.c in the KVM subsystem in the Linux kernel before 3.1.10 does not verify permission to access PCI configuration space and BAR resources, which allows host OS users to assign PCI devices and cause a denial of service (host OS crash) via a KVM_ASSIGN_PCI_DEVICE operation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: kvm: device assignment DoS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 and Red Hat Enterprise MRG as they did not provide support for the KVM subsystem. This has been addressed in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2012-0350.html. A future kvm update in Red Hat Enterprise 5 may address this flaw.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2011-4347"
        },
        {
          "category": "external",
          "summary": "RHBZ#756084",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=756084"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2011-4347",
          "url": "https://www.cve.org/CVERecord?id=CVE-2011-4347"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-4347",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2011-4347"
        }
      ],
      "release_date": "2011-11-20T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2012-02-21T02:20:00+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\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259\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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      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:H/Au:N/C:N/I:N/A:C",
            "version": "2.0"
          },
          "products": [
            "5Client-VT:kmod-kvm-0:83-249.el5.x86_64",
            "5Client-VT:kmod-kvm-debug-0:83-249.el5.x86_64",
            "5Client-VT:kvm-0:83-249.el5.src",
            "5Client-VT:kvm-0:83-249.el5.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-249.el5.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-249.el5.x86_64",
            "5Client-VT:kvm-tools-0:83-249.el5.x86_64",
            "5Server-VT:kmod-kvm-0:83-249.el5.x86_64",
            "5Server-VT:kmod-kvm-debug-0:83-249.el5.x86_64",
            "5Server-VT:kvm-0:83-249.el5.src",
            "5Server-VT:kvm-0:83-249.el5.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-249.el5.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-249.el5.x86_64",
            "5Server-VT:kvm-tools-0:83-249.el5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: kvm: device assignment DoS"
    }
  ]
}


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