rhsa-2015_1087
Vulnerability from csaf_redhat
Published
2015-06-10 14:46
Modified
2024-11-22 09:12
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. Red Hat Product Security 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. The qemu-kvm package provides the user-space component for running virtual machines using KVM. A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled multi-TMD packets with a length above 4096 bytes. A privileged guest user in a guest with an AMD PCNet ethernet card enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process. (CVE-2015-3209) Red Hat would like to thank Matt Tait of Google's Project Zero security team for reporting this issue. All qemu-kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct 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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          "title": "Vulnerability description"
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          "text": "qemu: pcnet: multi-tmd buffer overflow in the tx path",
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          "text": "This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 7 as they do not enable the pcnet backend driver.\n\nThis issue does not affect the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.\n\nThis issue affects the versions of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5, the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6, and the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3. Future updates for the respective releases may address this flaw.\n\nPlease note that AMD PCNet adapter has to be explicitly enabled per-guest as it is not enabled in default configuration and is not supported by Red Hat in Red Hat Enterprise Linux 6 (for a list of supported devices please consult https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Administration_Guide/sect-whitelist-device-options.html).",
          "title": "Statement"
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          "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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            "6Server-6.6.z:qemu-kvm-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Server-6.6.z:qemu-kvm-debuginfo-2:0.12.1.2-2.448.el6_6.4.i686",
            "6Server-6.6.z:qemu-kvm-debuginfo-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Server-6.6.z:qemu-kvm-tools-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Workstation-6.6.z:qemu-guest-agent-2:0.12.1.2-2.448.el6_6.4.i686",
            "6Workstation-6.6.z:qemu-guest-agent-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Workstation-6.6.z:qemu-img-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Workstation-6.6.z:qemu-kvm-2:0.12.1.2-2.448.el6_6.4.src",
            "6Workstation-6.6.z:qemu-kvm-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Workstation-6.6.z:qemu-kvm-debuginfo-2:0.12.1.2-2.448.el6_6.4.i686",
            "6Workstation-6.6.z:qemu-kvm-debuginfo-2:0.12.1.2-2.448.el6_6.4.x86_64",
            "6Workstation-6.6.z:qemu-kvm-tools-2:0.12.1.2-2.448.el6_6.4.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu: pcnet: multi-tmd buffer overflow in the tx path"
    }
  ]
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.