rhsa-2012_1234
Vulnerability from csaf_redhat
Published
2012-09-05 16:39
Modified
2024-11-05 17:50
Summary
Red Hat Security Advisory: qemu-kvm security update

Notes

Topic
Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having important 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. qemu-kvm is the user-space component for running virtual machines using KVM. A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. (CVE-2012-3515) This flaw did not affect the default use of KVM. Affected configurations were: * When guests were started from the command line ("/usr/libexec/qemu-kvm") without the "-nodefaults" option, and also without specifying a serial or parallel device, or a virtio-console device, that specifically does not use a virtual console (vc) back-end. (Note that Red Hat does not support invoking "qemu-kvm" from the command line without "-nodefaults" on Red Hat Enterprise Linux 6.) * Guests that were managed via libvirt, such as when using Virtual Machine Manager (virt-manager), but that have a serial or parallel device, or a virtio-console device, that uses a virtual console back-end. By default, guests managed via libvirt will not use a virtual console back-end for such devices. Red Hat would like to thank the Xen project for reporting this issue. All users of qemu-kvm should upgrade to these updated packages, which resolve this issue. 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.


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        "text": "Updated qemu-kvm packages that fix one security issue are now available for\nRed Hat Enterprise Linux 6.\n\nThe Red Hat Security Response Team has rated this update as having\nimportant security impact. A Common Vulnerability Scoring System (CVSS)\nbase score, which gives a detailed severity rating, is available from the\nCVE link in the 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. qemu-kvm is the user-space\ncomponent for running virtual machines using KVM.\n\nA flaw was found in the way QEMU handled VT100 terminal escape sequences\nwhen emulating certain character devices. A guest user with privileges to\nwrite to a character device that is emulated on the host using a virtual\nconsole back-end could use this flaw to crash the qemu-kvm process on the\nhost or, possibly, escalate their privileges on the host. (CVE-2012-3515)\n\nThis flaw did not affect the default use of KVM. Affected configurations\nwere:\n\n* When guests were started from the command line (\"/usr/libexec/qemu-kvm\")\nwithout the \"-nodefaults\" option, and also without specifying a\nserial or parallel device, or a virtio-console device, that specifically\ndoes not use a virtual console (vc) back-end. (Note that Red Hat does not\nsupport invoking \"qemu-kvm\" from the command line without \"-nodefaults\" on\nRed Hat Enterprise Linux 6.)\n\n* Guests that were managed via libvirt, such as when using Virtual Machine\nManager (virt-manager), but that have a serial or parallel device, or a\nvirtio-console device, that uses a virtual console back-end. By default,\nguests managed via libvirt will not use a virtual console back-end\nfor such devices.\n\nRed Hat would like to thank the Xen project for reporting this issue.\n\nAll users of qemu-kvm should upgrade to these updated packages, which\nresolve this issue. After installing this update, shut down all running\nvirtual machines. Once all virtual machines have shut down, start them\nagain for this update to take effect.",
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  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Xen project"
          ]
        }
      ],
      "cve": "CVE-2012-3515",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "discovery_date": "2012-08-23T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "851252"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Qemu, as used in Xen 4.0, 4.1 and possibly other products, when emulating certain devices with a virtual console backend, allows local OS guest users to gain privileges via a crafted escape VT100 sequence that triggers the overwrite of a \"device model\u0027s address space.\"",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu: VT100 emulation vulnerability",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did affect the versions of xen package as shipped with Red Hat\nEnterprise Linux 5.\n\nThis issue did affect the versions of kvm package as shipped with Red Hat\nEnterprise Linux 5.\n\nThis issue did affect the versions of qemu-kvm package as shipped with Red Hat\nEnterprise Linux 6.",
          "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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        {
          "category": "external",
          "summary": "RHBZ#851252",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=851252"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2012-3515",
          "url": "https://www.cve.org/CVERecord?id=CVE-2012-3515"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-3515",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2012-3515"
        }
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      "release_date": "2012-09-05T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2012-09-05T16:39:00+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/knowledge/articles/11258",
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            "accessVector": "ADJACENT_NETWORK",
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            "availabilityImpact": "COMPLETE",
            "baseScore": 7.4,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu: VT100 emulation vulnerability"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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