rhsa-2009_1659
Vulnerability from csaf_redhat
Published
2009-12-09 16:28
Modified
2024-11-14 10:47
Summary
Red Hat Security Advisory: kvm security and bug fix update

Notes

Topic
Updated kvm packages that fix one security issue and several bugs 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
KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. On x86 platforms, the do_insn_fetch() function did not limit the amount of instruction bytes fetched per instruction. Users in guest operating systems could leverage this flaw to cause large latencies on SMP hosts that could lead to a local denial of service on the host operating system. This update fixes this issue by imposing the architecturally-defined 15 byte length limit for instructions. (CVE-2009-4031) This update also fixes the following bugs: * performance problems occurred when using the qcow2 image format with the qemu-kvm -drive "cache=none" option (the default setting when not specified otherwise). This could cause guest operating system installations to take hours. With this update, performance patches have been backported so that using the qcow2 image format with the "cache=none" option no longer causes performance issues. (BZ#520693) * when using the virtual vm8086 mode, bugs in the emulated hardware task switching implementation may have, in some situations, caused older guest operating systems to malfunction. (BZ#532031) * Windows Server 2003 guests (32-bit) with more than 4GB of memory may have crashed during reboot when using the default qemu-kvm CPU settings. (BZ#532043) * with Red Hat Enterprise Virtualization, guests continued to run after encountering disk read errors. This could have led to their file systems becoming corrupted (but not the host's), notably in environments that use networked storage. With this update, the qemu-kvm -drive "werror=stop" option now applies not only to write errors but also to read errors: When using this option, guests will pause on disk read and write errors. By default, guests managed by Red Hat Enterprise Virtualization use the "werror=stop" option. This option is not used by default for guests managed by libvirt. (BZ#537334, BZ#540406) * the para-virtualized block driver (virtio-blk) silently ignored read errors when accessing disk images. With this update, the driver correctly signals the read error to the guest. (BZ#537334) All KVM users should upgrade to these updated packages, which contain backported patches to resolve these issues. Note: The procedure in the Solution section must be performed before this update will 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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{
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      "text": "Moderate"
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      {
        "category": "summary",
        "text": "Updated kvm packages that fix one security issue and several bugs 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.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for\nthe standard Red Hat Enterprise Linux kernel.\n\nOn x86 platforms, the do_insn_fetch() function did not limit the amount of\ninstruction bytes fetched per instruction. Users in guest operating systems\ncould leverage this flaw to cause large latencies on SMP hosts that could\nlead to a local denial of service on the host operating system. This\nupdate fixes this issue by imposing the architecturally-defined 15 byte\nlength limit for instructions. (CVE-2009-4031)\n\nThis update also fixes the following bugs:\n\n* performance problems occurred when using the qcow2 image format with the\nqemu-kvm -drive \"cache=none\" option (the default setting when not specified\notherwise). This could cause guest operating system installations to take\nhours. With this update, performance patches have been backported so that\nusing the qcow2 image format with the \"cache=none\" option no longer causes\nperformance issues. (BZ#520693)\n\n* when using the virtual vm8086 mode, bugs in the emulated hardware task\nswitching implementation may have, in some situations, caused older guest\noperating systems to malfunction. (BZ#532031)\n\n* Windows Server 2003 guests (32-bit) with more than 4GB of memory may have\ncrashed during reboot when using the default qemu-kvm CPU settings.\n(BZ#532043)\n\n* with Red Hat Enterprise Virtualization, guests continued to run after\nencountering disk read errors. This could have led to their file systems\nbecoming corrupted (but not the host\u0027s), notably in environments that use\nnetworked storage. With this update, the qemu-kvm -drive \"werror=stop\"\noption now applies not only to write errors but also to read errors: When\nusing this option, guests will pause on disk read and write errors.\n\nBy default, guests managed by Red Hat Enterprise Virtualization use the\n\"werror=stop\" option. This option is not used by default for guests managed\nby libvirt. (BZ#537334, BZ#540406)\n\n* the para-virtualized block driver (virtio-blk) silently ignored read\nerrors when accessing disk images. With this update, the driver correctly\nsignals the read error to the guest. (BZ#537334)\n\nAll KVM users should upgrade to these updated packages, which contain\nbackported patches to resolve these issues. Note: The procedure in the\nSolution section must be performed before this update will take effect.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2009/rhsa-2009_1659.json"
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    ],
    "title": "Red Hat Security Advisory: kvm security and bug fix update",
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  "vulnerabilities": [
    {
      "cve": "CVE-2009-4031",
      "discovery_date": "2009-11-25T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "541160"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The do_insn_fetch function in arch/x86/kvm/emulate.c in the x86 emulator in the KVM subsystem in the Linux kernel before 2.6.32-rc8-next-20091125 tries to interpret instructions that contain too many bytes to be valid, which allows guest OS users to cause a denial of service (increased scheduling latency) on the host OS via unspecified manipulations related to SMP support.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: KVM: x86 emulator: limit instructions to 15 bytes",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "5Client-VT:kvm-tools-0:83-105.el5_4.13.x86_64",
          "5Server-VT:kmod-kvm-0:83-105.el5_4.13.x86_64",
          "5Server-VT:kvm-0:83-105.el5_4.13.src",
          "5Server-VT:kvm-0:83-105.el5_4.13.x86_64",
          "5Server-VT:kvm-debuginfo-0:83-105.el5_4.13.x86_64",
          "5Server-VT:kvm-qemu-img-0:83-105.el5_4.13.x86_64",
          "5Server-VT:kvm-tools-0:83-105.el5_4.13.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2009-4031"
        },
        {
          "category": "external",
          "summary": "RHBZ#541160",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=541160"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2009-4031",
          "url": "https://www.cve.org/CVERecord?id=CVE-2009-4031"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2009-4031",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-4031"
        }
      ],
      "release_date": "2009-11-24T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2009-12-09T16:28:00+00:00",
          "details": "Before applying this update, make sure that all previously-released\nerrata relevant to your system have been applied.\n\nThis update is available via Red Hat Network. Details on how to use\nthe Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259\n\nThe following procedure must be performed before this update will take\neffect:\n\n1) Stop all KVM guest virtual machines.\n\n2) Either reboot the hypervisor machine or, as the root user, remove (using\n\"modprobe -r [module]\") and reload (using \"modprobe [module]\") all of the\nfollowing modules which are currently running (determined using \"lsmod\"):\nkvm, ksm, kvm-intel or kvm-amd.\n\n3) Restart the KVM guest virtual machines.",
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            "5Client-VT:kvm-debuginfo-0:83-105.el5_4.13.x86_64",
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            "5Server-VT:kvm-tools-0:83-105.el5_4.13.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2009:1659"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "products": [
            "5Client-VT:kmod-kvm-0:83-105.el5_4.13.x86_64",
            "5Client-VT:kvm-0:83-105.el5_4.13.src",
            "5Client-VT:kvm-0:83-105.el5_4.13.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-105.el5_4.13.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-105.el5_4.13.x86_64",
            "5Client-VT:kvm-tools-0:83-105.el5_4.13.x86_64",
            "5Server-VT:kmod-kvm-0:83-105.el5_4.13.x86_64",
            "5Server-VT:kvm-0:83-105.el5_4.13.src",
            "5Server-VT:kvm-0:83-105.el5_4.13.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-105.el5_4.13.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-105.el5_4.13.x86_64",
            "5Server-VT:kvm-tools-0:83-105.el5_4.13.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: KVM: x86 emulator: limit instructions to 15 bytes"
    }
  ]
}


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