rhsa-2011_1531
Vulnerability from csaf_redhat
Published
2011-12-05 20:23
Modified
2024-11-05 17:38
Summary
Red Hat Security Advisory: qemu-kvm security, bug fix, and enhancement update

Notes

Topic
Updated qemu-kvm packages that fix one security issue, multiple bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6. 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. qemu-kvm is the user-space component for running virtual machines using KVM. It was found that qemu-kvm did not properly drop supplemental group privileges when the root user started guests from the command line ("/usr/libexec/qemu-kvm") with the "-runas" option. A qemu-kvm process started this way could use this flaw to gain access to files on the host that are accessible to the supplementary groups and not accessible to the primary group. (CVE-2011-2527) Note: This issue only affected qemu-kvm when it was started directly from the command line. It did not affect the Red Hat Enterprise Virtualization platform or applications that start qemu-kvm via libvirt, such as the Virtual Machine Manager (virt-manager). This update also fixes several bugs and adds various enhancements. Documentation for these bug fixes and enhancements will be available shortly from the Technical Notes document, linked to in the References section. All users of qemu-kvm are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. 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": "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 qemu-kvm did not properly drop supplemental group\nprivileges when the root user started guests from the command line\n(\"/usr/libexec/qemu-kvm\") with the \"-runas\" option. A qemu-kvm process\nstarted this way could use this flaw to gain access to files on the host\nthat are accessible to the supplementary groups and not accessible to the\nprimary group. (CVE-2011-2527)\n\nNote: This issue only affected qemu-kvm when it was started directly from\nthe command line. It did not affect the Red Hat Enterprise Virtualization\nplatform or applications that start qemu-kvm via libvirt, such as the\nVirtual Machine Manager (virt-manager).\n\nThis update also fixes several bugs and adds various enhancements.\nDocumentation for these bug fixes and enhancements will be available\nshortly from the Technical Notes document, linked to in the References\nsection.\n\nAll users of qemu-kvm are advised to upgrade to these updated packages,\nwhich contain backported patches to correct these issues and add these\nenhancements. After installing this update, shut down all running virtual\nmachines. Once all virtual machines have shut down, start them again for\nthis update to take effect.",
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      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "720773"
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          "text": "The change_process_uid function in os-posix.c in Qemu 0.14.0 and earlier does not properly drop group privileges when the -runas option is used, which allows local guest users to access restricted files on the host.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu: when started as root, extra groups are not dropped correctly",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Future qemu-kvm updates in Red Hat Enterprise Linux 6 may address this flaw. This issue did not affect the versions of qemu-kvm as shipped with Red Hat Enterprise Linux 5 as it did not include support for \"run as\" functionality.",
          "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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          "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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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "qemu: when started as root, extra groups are not dropped correctly"
    }
  ]
}


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