rhsa-2012_0676
Vulnerability from csaf_redhat
Published
2012-05-21 13:47
Modified
2024-11-05 17:45
Summary
Red Hat Security Advisory: kvm security and bug fix update

Notes

Topic
Updated kvm packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate 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. A flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled. Calling this ioctl when at least one virtual CPU (VCPU) already existed could lead to a NULL pointer dereference later when the VCPU is scheduled to run. A malicious user in the kvm group on the host could use this flaw to crash the host. (CVE-2012-1601) A flaw was found in the way device memory was handled during guest device removal. Upon successful device removal, memory used by the device was not properly unmapped from the corresponding IOMMU or properly released from the kernel, leading to a memory leak. A malicious user in the kvm group on the host who has the ability to assign a device to a guest could use this flaw to crash the host. (CVE-2012-2121) This update also fixes the following bug: * An off-by-one error in the QEMU guest's memory management could, in rare cases, cause QEMU-KVM to crash due to a segmentation fault in tb_invalidate_phys_page_range() if a device initiated DMA into a specific guest address. In a reported case, this issue presented on a system that had a guest using the 8139cp network driver. (BZ#816207) All users of kvm are advised to upgrade to these updated packages, which contain backported patches to correct these issues. Note that 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.


To clipboard 

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        "text": "Updated kvm packages that fix two security issues and one bug are now\navailable for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having moderate\nsecurity impact. Common Vulnerability Scoring System (CVSS) base scores,\nwhich give detailed severity ratings, are available for each vulnerability\nfrom 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\nA flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled.\nCalling this ioctl when at least one virtual CPU (VCPU) already existed\ncould lead to a NULL pointer dereference later when the VCPU is scheduled\nto run. A malicious user in the kvm group on the host could use this flaw\nto crash the host. (CVE-2012-1601)\n\nA flaw was found in the way device memory was handled during guest device\nremoval. Upon successful device removal, memory used by the device was not\nproperly unmapped from the corresponding IOMMU or properly released from\nthe kernel, leading to a memory leak. A malicious user in the kvm group on\nthe host who has the ability to assign a device to a guest could use this\nflaw to crash the host. (CVE-2012-2121)\n\nThis update also fixes the following bug:\n\n* An off-by-one error in the QEMU guest\u0027s memory management could, in rare\ncases, cause QEMU-KVM to crash due to a segmentation fault in\ntb_invalidate_phys_page_range() if a device initiated DMA into a specific\nguest address. In a reported case, this issue presented on a system that\nhad a guest using the 8139cp network driver. (BZ#816207)\n\nAll users of kvm are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. Note that the procedure\nin the Solution section must be performed before this update will take\neffect.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2012-1601",
      "discovery_date": "2012-03-07T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "808199"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The KVM implementation in the Linux kernel before 3.3.6 allows host OS users to cause a denial of service (NULL pointer dereference and host OS crash) by making a KVM_CREATE_IRQCHIP ioctl call after a virtual CPU already exists.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: kvm: irqchip_in_kernel() and vcpu-\u003earch.apic inconsistency",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise MRG as they did not provide support for the KVM subsystem. This has been addressed in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2012-0571.html. This has been addressed in Red Hat Enterprise Linux 5 via RHSA-2012:0676 https://rhn.redhat.com/errata/RHSA-2012-0676.html.",
          "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"
        }
      ],
      "product_status": {
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          "5Server-VT-5.8.Z:kmod-kvm-0:83-249.el5_8.4.x86_64",
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          "5Server-VT-5.8.Z:kvm-0:83-249.el5_8.4.x86_64",
          "5Server-VT-5.8.Z:kvm-debuginfo-0:83-249.el5_8.4.x86_64",
          "5Server-VT-5.8.Z:kvm-qemu-img-0:83-249.el5_8.4.x86_64",
          "5Server-VT-5.8.Z:kvm-tools-0:83-249.el5_8.4.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2012-1601"
        },
        {
          "category": "external",
          "summary": "RHBZ#808199",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=808199"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2012-1601",
          "url": "https://www.cve.org/CVERecord?id=CVE-2012-1601"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-1601",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2012-1601"
        }
      ],
      "release_date": "2012-02-07T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2012-05-21T13:47:00+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\nhttps://access.redhat.com/knowledge/articles/11258\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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      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:H/Au:N/C:N/I:N/A:C",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: kvm: irqchip_in_kernel() and vcpu-\u003earch.apic inconsistency"
    },
    {
      "cve": "CVE-2012-2121",
      "discovery_date": "2012-04-11T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "814149"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the relationships between memory slots and the iommu, which allows guest OS users to cause a denial of service (memory leak and host OS crash) by leveraging administrative access to the guest OS to conduct hotunplug and hotplug operations on devices.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kvm: device assignment page leak",
          "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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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2012-2121"
        },
        {
          "category": "external",
          "summary": "RHBZ#814149",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=814149"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2012-2121",
          "url": "https://www.cve.org/CVERecord?id=CVE-2012-2121"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-2121",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2012-2121"
        }
      ],
      "release_date": "2012-03-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2012-05-21T13:47:00+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\nhttps://access.redhat.com/knowledge/articles/11258\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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            "availabilityImpact": "COMPLETE",
            "baseScore": 4.7,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:M/Au:N/C:N/I:N/A:C",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kvm: device assignment page leak"
    }
  ]
}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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