RHSA-2010:0627
Vulnerability from csaf_redhat
Published
2010-08-19 21:31
Modified
2024-11-14 10:49
Summary
Red Hat Security Advisory: kvm security and bug fix update

Notes

Topic
Updated kvm packages that fix three security issues and multiple bugs are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
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. It was found that QEMU-KVM on the host did not validate all pointers provided from a guest system's QXL graphics card driver. A privileged guest user could use this flaw to cause the host to dereference an invalid pointer, causing the guest to crash (denial of service) or, possibly, resulting in the privileged guest user escalating their privileges on the host. (CVE-2010-0431) A flaw was found in QEMU-KVM, allowing the guest some control over the index used to access the callback array during sub-page MMIO initialization. A privileged guest user could use this flaw to crash the guest (denial of service) or, possibly, escalate their privileges on the host. (CVE-2010-2784) A NULL pointer dereference flaw was found when the host system had a processor with the Intel VT-x extension enabled. A privileged guest user could use this flaw to trick the host into emulating a certain instruction, which could crash the host (denial of service). (CVE-2010-0435) This update also fixes the following bugs: * running a "qemu-img" check on a faulty virtual machine image ended with a segmentation fault. With this update, the segmentation fault no longer occurs when running the "qemu-img" check. (BZ#610342) * when attempting to transfer a file between two guests that were joined in the same virtual LAN (VLAN), the receiving guest unexpectedly quit. With this update, the transfer completes successfully. (BZ#610343) * installation of a system was occasionally failing in KVM. This was caused by KVM using wrong permissions for large guest pages. With this update, the installation completes successfully. (BZ#616796) * previously, the migration process would fail for a virtual machine because the virtual machine could not map all the memory. This was caused by a conflict that was initiated when a virtual machine was initially run and then migrated right away. With this update, the conflict no longer occurs and the migration process no longer fails. (BZ#618205) * using a thinly provisioned VirtIO disk on iSCSI storage and performing a "qemu-img" check during an "e_no_space" event returned cluster errors. With this update, the errors no longer appear. (BZ#618206) 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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        "category": "summary",
        "text": "Updated kvm packages that fix three security issues and multiple bugs are\nnow available for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having\nimportant security impact. Common Vulnerability Scoring System (CVSS) base\nscores, which give detailed severity ratings, are available for each\nvulnerability from the CVE links in the References section.",
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        "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\nIt was found that QEMU-KVM on the host did not validate all pointers\nprovided from a guest system\u0027s QXL graphics card driver. A privileged guest\nuser could use this flaw to cause the host to dereference an invalid\npointer, causing the guest to crash (denial of service) or, possibly,\nresulting in the privileged guest user escalating their privileges on the\nhost. (CVE-2010-0431)\n\nA flaw was found in QEMU-KVM, allowing the guest some control over the\nindex used to access the callback array during sub-page MMIO\ninitialization. A privileged guest user could use this flaw to crash the\nguest (denial of service) or, possibly, escalate their privileges on the\nhost. (CVE-2010-2784)\n\nA NULL pointer dereference flaw was found when the host system had a\nprocessor with the Intel VT-x extension enabled. A privileged guest user\ncould use this flaw to trick the host into emulating a certain instruction,\nwhich could crash the host (denial of service). (CVE-2010-0435)\n\nThis update also fixes the following bugs:\n\n* running a \"qemu-img\" check on a faulty virtual machine image ended with a\nsegmentation fault. With this update, the segmentation fault no longer\noccurs when running the \"qemu-img\" check. (BZ#610342)\n\n* when attempting to transfer a file between two guests that were joined in\nthe same virtual LAN (VLAN), the receiving guest unexpectedly quit. With\nthis update, the transfer completes successfully. (BZ#610343)\n\n* installation of a system was occasionally failing in KVM. This was caused\nby KVM using wrong permissions for large guest pages. With this update, the\ninstallation completes successfully. (BZ#616796)\n\n* previously, the migration process would fail for a virtual machine\nbecause the virtual machine could not map all the memory. This was caused\nby a conflict that was initiated when a virtual machine was initially run\nand then migrated right away. With this update, the conflict no longer\noccurs and the migration process no longer fails. (BZ#618205)\n\n* using a thinly provisioned VirtIO disk on iSCSI storage and performing a\n\"qemu-img\" check during an \"e_no_space\" event returned cluster errors. With\nthis update, the errors no longer appear. (BZ#618206)\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"
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        "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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  "vulnerabilities": [
    {
      "cve": "CVE-2010-0431",
      "discovery_date": "2010-02-23T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "568809"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "QEMU-KVM, as used in the Hypervisor (aka rhev-hypervisor) in Red Hat Enterprise Virtualization (RHEV) 2.2 and KVM 83, does not properly validate guest QXL driver pointers, which allows guest OS users to cause a denial of service (invalid pointer dereference and guest OS crash) or possibly gain privileges via unspecified vectors.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu: Insufficient guest provided pointers validation",
          "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": {
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          "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-0:83-164.el5_5.21.src",
          "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2010-0431"
        },
        {
          "category": "external",
          "summary": "RHBZ#568809",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=568809"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2010-0431",
          "url": "https://www.cve.org/CVERecord?id=CVE-2010-0431"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2010-0431",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-0431"
        }
      ],
      "release_date": "2010-08-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2010-08-19T21:31:00+00:00",
          "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\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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            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2010:0627"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.6,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:S/C:C/I:C/A:C",
            "version": "2.0"
          },
          "products": [
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            "5Client-VT:kvm-0:83-164.el5_5.21.src",
            "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.21.src",
            "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu: Insufficient guest provided pointers validation"
    },
    {
      "cve": "CVE-2010-0435",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "discovery_date": "2010-03-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "570528"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The Hypervisor (aka rhev-hypervisor) in Red Hat Enterprise Virtualization (RHEV) 2.2, and KVM 83, when the Intel VT-x extension is enabled, allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) via vectors related to instruction emulation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kvm: vmx null pointer dereference",
          "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": [
          "5Client-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-0:83-164.el5_5.21.src",
          "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-0:83-164.el5_5.21.src",
          "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2010-0435"
        },
        {
          "category": "external",
          "summary": "RHBZ#570528",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=570528"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2010-0435",
          "url": "https://www.cve.org/CVERecord?id=CVE-2010-0435"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2010-0435",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-0435"
        }
      ],
      "release_date": "2010-08-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2010-08-19T21:31:00+00:00",
          "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\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.",
          "product_ids": [
            "5Client-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-0:83-164.el5_5.21.src",
            "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.21.src",
            "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2010:0627"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 4.6,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:S/C:N/I:N/A:C",
            "version": "2.0"
          },
          "products": [
            "5Client-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-0:83-164.el5_5.21.src",
            "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.21.src",
            "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kvm: vmx null pointer dereference"
    },
    {
      "cve": "CVE-2010-2784",
      "discovery_date": "2010-07-28T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "619411"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The subpage MMIO initialization functionality in the subpage_register function in exec.c in QEMU-KVM, as used in the Hypervisor (aka rhev-hypervisor) in Red Hat Enterprise Virtualization (RHEV) 2.2 and KVM 83, does not properly select the index for access to the callback array, which allows guest OS users to cause a denial of service (guest OS crash) or possibly gain privileges via unspecified vectors.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu: insufficient constraints checking in exec.c:subpage_register()",
          "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": [
          "5Client-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-0:83-164.el5_5.21.src",
          "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
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          "5Server-VT:kvm-0:83-164.el5_5.21.src",
          "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
          "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2010-2784"
        },
        {
          "category": "external",
          "summary": "RHBZ#619411",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=619411"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2010-2784",
          "url": "https://www.cve.org/CVERecord?id=CVE-2010-2784"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2010-2784",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-2784"
        }
      ],
      "release_date": "2010-07-28T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2010-08-19T21:31:00+00:00",
          "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\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.",
          "product_ids": [
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            "5Client-VT:kvm-0:83-164.el5_5.21.src",
            "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.21.src",
            "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2010:0627"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.6,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:S/C:C/I:C/A:C",
            "version": "2.0"
          },
          "products": [
            "5Client-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-0:83-164.el5_5.21.src",
            "5Client-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Client-VT:kvm-tools-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kmod-kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-0:83-164.el5_5.21.src",
            "5Server-VT:kvm-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-debuginfo-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-qemu-img-0:83-164.el5_5.21.x86_64",
            "5Server-VT:kvm-tools-0:83-164.el5_5.21.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu: insufficient constraints checking in exec.c:subpage_register()"
    }
  ]
}


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