rhsa-2008_0892
Vulnerability from csaf_redhat
Published
2008-10-01 15:27
Modified
2024-11-05 16:59
Summary
Red Hat Security Advisory: xen security and bug fix update

Notes

Topic
Updated xen packages that resolve a couple of security issues and fix a bug are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team.
Details
The xen packages contain tools for managing the virtual machine monitor in Red Hat Virtualization. It was discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the frontend's framebuffer description properly. This could allow a privileged user in the unprivileged domain (DomU) to cause a denial of service, or, possibly, elevate privileges to the privileged domain (Dom0). (CVE-2008-1952) A flaw was found in the QEMU block format auto-detection, when running fully-virtualized guests and using Qemu images written on removable media (USB storage, 3.5" disks). Privileged users of such fully-virtualized guests (DomU), with a raw-formatted disk image, were able to write a header to that disk image describing another format. This could allow such guests to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945) Additionally, the following bug is addressed in this update: * The qcow-create command terminated when invoked due to glibc bounds checking on the realpath() function. Users of xen are advised to upgrade to these updated packages, which resolve these security issues and fix this bug.
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 xen packages that resolve a couple of security issues and fix a bug\nare now available for Red Hat Enterprise Linux 5.\n\nThis update has been rated as having important security impact by the Red\nHat Security Response Team.",
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    {
      "cve": "CVE-2008-1952",
      "discovery_date": "2008-05-21T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "447759"
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          "text": "The backend for XenSource Xen Para Virtualized Frame Buffer (PVFB) in Xen ioemu does not properly restrict the frame buffer size, which allows attackers to cause a denial of service (crash) by mapping an arbitrary amount of guest memory.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size",
          "title": "Vulnerability summary"
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      "title": "qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size"
    }
  ]
}


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