rhsa-2011_0919
Vulnerability from csaf_redhat
Published
2011-07-05 18:05
Modified
2024-11-22 04:29
Summary
Red Hat Security Advisory: qemu-kvm security and bug fix update

Notes

Topic
Updated qemu-kvm packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 6. 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. qemu-kvm is the user-space component for running virtual machines using KVM. It was found that the virtio subsystem in qemu-kvm did not properly validate virtqueue in and out requests from the guest. A privileged guest user could use this flaw to trigger a buffer overflow, allowing them to crash the guest (denial of service) or, possibly, escalate their privileges on the host. (CVE-2011-2212) It was found that the virtio_queue_notify() function in qemu-kvm did not perform sufficient input validation on the value later used as an index into the array of virtqueues. An unprivileged guest user could use this flaw to crash the guest (denial of service) or, possibly, escalate their privileges on the host. (CVE-2011-2512) Red Hat would like to thank Nelson Elhage for reporting CVE-2011-2212. This update also fixes the following bug: * A bug was found in the way vhost (in qemu-kvm) set up mappings with the host kernel's vhost module. This could result in the host kernel's vhost module not having a complete view of a guest system's memory, if that guest had more than 4 GB of memory. Consequently, hot plugging a vhost-net network device and restarting the guest may have resulted in that device no longer working. (BZ#701771) All users of qemu-kvm should upgrade to these updated packages, which contain backported patches to resolve these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to 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.


To clipboard 

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        "text": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component\nfor running virtual machines using KVM.\n\nIt was found that the virtio subsystem in qemu-kvm did not properly\nvalidate virtqueue in and out requests from the guest. A privileged guest\nuser could use this flaw to trigger a buffer overflow, allowing them to\ncrash the guest (denial of service) or, possibly, escalate their privileges\non the host. (CVE-2011-2212)\n\nIt was found that the virtio_queue_notify() function in qemu-kvm did not\nperform sufficient input validation on the value later used as an index\ninto the array of virtqueues. An unprivileged guest user could use this\nflaw to crash the guest (denial of service) or, possibly, escalate their\nprivileges on the host. (CVE-2011-2512)\n\nRed Hat would like to thank Nelson Elhage for reporting CVE-2011-2212.\n\nThis update also fixes the following bug:\n\n* A bug was found in the way vhost (in qemu-kvm) set up mappings with the\nhost kernel\u0027s vhost module. This could result in the host kernel\u0027s vhost\nmodule not having a complete view of a guest system\u0027s memory, if that guest\nhad more than 4 GB of memory. Consequently, hot plugging a vhost-net\nnetwork device and restarting the guest may have resulted in that device no\nlonger working. (BZ#701771)\n\nAll users of qemu-kvm should upgrade to these updated packages, which\ncontain backported patches to resolve these issues. After installing this\nupdate, shut down all running virtual machines. Once all virtual machines\nhave shut down, start them again for this update to take effect.",
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          "text": "Buffer overflow in the virtio subsystem in qemu-kvm 0.14.0 and earlier allows privileged guest users to cause a denial of service (guest crash) or gain privileges via a crafted indirect descriptor related to \"virtqueue in and out requests.\"",
          "title": "Vulnerability description"
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          "text": "qemu-kvm: virtqueue: too-large indirect descriptor buffer overflow",
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          "text": "This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm\nas shipped with Red Hat Enterprise Linux 5 is not affected because it does not provide support for indirect descriptors.",
          "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.",
          "title": "CVSS score applicability"
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 7.4,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
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            "version": "2.0"
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      ],
      "title": "qemu-kvm: virtqueue: too-large indirect descriptor buffer overflow"
    },
    {
      "cve": "CVE-2011-2512",
      "discovery_date": "2011-06-27T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "717399"
        }
      ],
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        {
          "category": "description",
          "text": "The virtio_queue_notify in qemu-kvm 0.14.0 and earlier does not properly validate the virtqueue number, which allows guest users to cause a denial of service (guest crash) and possibly execute arbitrary code via a negative number in the Queue Notify field of the Virtio Header, which bypasses a signed comparison.",
          "title": "Vulnerability description"
        },
        {
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          "text": "qemu-kvm: OOB memory access caused by negative vq notifies",
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        },
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          "text": "This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm\nas shipped with Red Hat Enterprise Linux 5 is not affected.",
          "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": "RHBZ#717399",
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2011-2512",
          "url": "https://www.cve.org/CVERecord?id=CVE-2011-2512"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-2512",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2011-2512"
        }
      ],
      "release_date": "2011-05-08T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2011-07-05T18:05:00+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",
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      "scores": [
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "SINGLE",
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            "baseScore": 6.5,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:A/AC:H/Au:S/C:C/I:C/A:C",
            "version": "2.0"
          },
          "products": [
            "6Server-6.1.z:qemu-img-2:0.12.1.2-2.160.el6_1.2.x86_64",
            "6Server-6.1.z:qemu-kvm-2:0.12.1.2-2.160.el6_1.2.src",
            "6Server-6.1.z:qemu-kvm-2:0.12.1.2-2.160.el6_1.2.x86_64",
            "6Server-6.1.z:qemu-kvm-debuginfo-2:0.12.1.2-2.160.el6_1.2.x86_64",
            "6Server-6.1.z:qemu-kvm-tools-2:0.12.1.2-2.160.el6_1.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu-kvm: OOB memory access caused by negative vq notifies"
    }
  ]
}


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