rhsa-2009_0003
Vulnerability from csaf_redhat
Published
2009-01-07 10:33
Modified
2024-11-22 02:18
Summary
Red Hat Security Advisory: xen security and bug fix update

Notes

Topic
Updated xen packages that resolve several security issues and a bug are now available for Red Hat Enterprise Linux 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team.
Details
The xen packages contain the Xen tools and management daemons needed to manage virtual machines running on Red Hat Enterprise Linux. Xen was found to allow unprivileged DomU domains to overwrite xenstore values which should only be changeable by the privileged Dom0 domain. An attacker controlling a DomU domain could, potentially, use this flaw to kill arbitrary processes in Dom0 or trick a Dom0 user into accessing the text console of a different domain running on the same host. This update makes certain parts of the xenstore tree read-only to the unprivileged DomU domains. (CVE-2008-4405) It was discovered that the qemu-dm.debug script created a temporary file in /tmp in an insecure way. A local attacker in Dom0 could, potentially, use this flaw to overwrite arbitrary files via a symlink attack. Note: This script is not needed in production deployments and therefore was removed and is not shipped with updated xen packages. (CVE-2008-4993) This update also fixes the following bug: * xen calculates its running time by adding the hypervisor's up-time to the hypervisor's boot-time record. In live migrations of para-virtualized guests, however, the guest would over-write the new hypervisor's boot-time record with the boot-time of the previous hypervisor. This caused time-dependent processes on the guests to fail (for example, crond would fail to start cron jobs). With this update, the new hypervisor's boot-time record is no longer over-written during live migrations. All xen users are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. The Xen host must be restarted for the 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 xen packages that resolve several security issues and a bug are now\navailable for Red Hat Enterprise Linux 5.\n\nThis update has been rated as having moderate security impact by the Red\nHat Security Response Team.",
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        "text": "The xen packages contain the Xen tools and management daemons needed to\nmanage virtual machines running on Red Hat Enterprise Linux.\n\nXen was found to allow unprivileged DomU domains to overwrite xenstore\nvalues which should only be changeable by the privileged Dom0 domain. An\nattacker controlling a DomU domain could, potentially, use this flaw to\nkill arbitrary processes in Dom0 or trick a Dom0 user into accessing the\ntext console of a different domain running on the same host. This update\nmakes certain parts of the xenstore tree read-only to the unprivileged DomU\ndomains. (CVE-2008-4405)\n\nIt was discovered that the qemu-dm.debug script created a temporary file in\n/tmp in an insecure way. A local attacker in Dom0 could, potentially, use\nthis flaw to overwrite arbitrary files via a symlink attack. Note: This\nscript is not needed in production deployments and therefore was removed\nand is not shipped with updated xen packages. (CVE-2008-4993)\n\nThis update also fixes the following bug:\n\n* xen calculates its running time by adding the hypervisor\u0027s up-time to the\nhypervisor\u0027s boot-time record. In live migrations of para-virtualized\nguests, however, the guest would over-write the new hypervisor\u0027s boot-time\nrecord with the boot-time of the previous hypervisor. This caused\ntime-dependent processes on the guests to fail (for example, crond would\nfail to start cron jobs). With this update, the new hypervisor\u0027s boot-time\nrecord is no longer over-written during live migrations.\n\nAll xen users are advised to upgrade to these updated packages, which\ncontain backported patches to resolve these issues. The Xen host must be\nrestarted for the update to take effect.",
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          "text": "xend in Xen 3.0.3 does not properly limit the contents of the /local/domain xenstore directory tree, and does not properly restrict a guest VM\u0027s write access within this tree, which allows guest OS users to cause a denial of service and possibly have unspecified other impact by writing to (1) console/tty, (2) console/limit, or (3) image/device-model-pid.  NOTE: this issue was originally reported as an issue in libvirt 0.3.3 and xenstore, but CVE is considering the core issue to be related to Xen.",
          "title": "Vulnerability description"
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          "text": "xen: Multiple unsafe uses of guest-writable data from xenstore",
          "title": "Vulnerability summary"
        },
        {
          "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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            "5Server-VT:xen-libs-0:3.0.3-64.el5_2.9.ia64",
            "5Server-VT:xen-libs-0:3.0.3-64.el5_2.9.x86_64",
            "5Server:xen-0:3.0.3-64.el5_2.9.i386",
            "5Server:xen-0:3.0.3-64.el5_2.9.ia64",
            "5Server:xen-0:3.0.3-64.el5_2.9.src",
            "5Server:xen-0:3.0.3-64.el5_2.9.x86_64",
            "5Server:xen-debuginfo-0:3.0.3-64.el5_2.9.i386",
            "5Server:xen-debuginfo-0:3.0.3-64.el5_2.9.ia64",
            "5Server:xen-debuginfo-0:3.0.3-64.el5_2.9.x86_64",
            "5Server:xen-devel-0:3.0.3-64.el5_2.9.i386",
            "5Server:xen-devel-0:3.0.3-64.el5_2.9.ia64",
            "5Server:xen-devel-0:3.0.3-64.el5_2.9.x86_64",
            "5Server:xen-libs-0:3.0.3-64.el5_2.9.i386",
            "5Server:xen-libs-0:3.0.3-64.el5_2.9.ia64",
            "5Server:xen-libs-0:3.0.3-64.el5_2.9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2009:0003"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "xen: insecure temporary file use in qemu-dm.debug"
    }
  ]
}


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