rhsa-2016_1943
Vulnerability from csaf_redhat
Published
2016-09-27 16:01
Modified
2024-11-14 20:48
Summary
Red Hat Security Advisory: kvm security update

Notes

Topic
An update for kvm is now available for Red Hat Enterprise Linux 5. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc. Security Fix(es): * An out-of-bounds read/write access flaw was found in the way QEMU's VGA emulation with VESA BIOS Extensions (VBE) support performed read/write operations using I/O port methods. A privileged guest user could use this flaw to execute arbitrary code on the host with the privileges of the host's QEMU process. (CVE-2016-3710) * Quick Emulator(QEMU) built with the virtio framework is vulnerable to an unbounded memory allocation issue. It was found that a malicious guest user could submit more requests than the virtqueue size permits. Processing a request allocates a VirtQueueElement results in unbounded memory allocation on the host controlled by the guest. (CVE-2016-5403) Red Hat would like to thank Wei Xiao (360 Marvel Team) and Qinghao Tang (360 Marvel Team) for reporting CVE-2016-3710 and hongzhenhao (Marvel Team) for reporting CVE-2016-5403.
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": "KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.\n\nSecurity Fix(es):\n\n* An out-of-bounds read/write access flaw was found in the way QEMU\u0027s VGA emulation with VESA BIOS Extensions (VBE) support performed read/write operations using I/O port methods. A privileged guest user could use this flaw to execute arbitrary code on the host with the privileges of the host\u0027s QEMU process. (CVE-2016-3710)\n\n* Quick Emulator(QEMU) built with the virtio framework is vulnerable to an unbounded memory allocation issue. It was found that a malicious guest user could submit more requests than the virtqueue size permits. Processing a request allocates a VirtQueueElement results in unbounded memory allocation on the host controlled by the guest. (CVE-2016-5403)\n\nRed Hat would like to thank Wei Xiao (360 Marvel Team) and Qinghao Tang (360 Marvel Team) for reporting CVE-2016-3710 and hongzhenhao (Marvel Team) for reporting CVE-2016-5403.",
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Qinghao Tang",
            "Wei Xiao"
          ],
          "organization": "360.cn Marvel Team"
        }
      ],
      "cve": "CVE-2016-3710",
      "discovery_date": "2016-04-22T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1331401"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An out-of-bounds read/write access flaw was found in the way QEMU\u0027s VGA emulation with VESA BIOS Extensions (VBE) support performed read/write operations using I/O port methods. A privileged guest user could use this flaw to execute arbitrary code on the host with the privileges of the host\u0027s QEMU process.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "qemu: incorrect banked access bounds checking in vga module",
          "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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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2016-3710"
        },
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          "category": "external",
          "summary": "RHBZ#1331401",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1331401"
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        {
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-3710",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-3710"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-3710",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-3710"
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      "release_date": "2016-05-09T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2016-09-27T16:01:25+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nNote: The procedure in the Solution section must be performed before this update will take effect.",
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.5,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:A/AC:H/Au:S/C:C/I:C/A:C",
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          },
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "qemu: incorrect banked access bounds checking in vga module"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "hongzhenhao"
          ],
          "organization": "Marvel Team"
        }
      ],
      "cve": "CVE-2016-5403",
      "discovery_date": "2016-07-20T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1358359"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Quick Emulator (QEMU) built with the virtio framework is vulnerable to an unbounded memory allocation issue. It was found that a malicious guest user could submit more requests than the virtqueue size permits. Processing a request allocates a VirtQueueElement results in unbounded memory allocation on the host controlled by the guest.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Qemu: virtio: unbounded memory allocation on host via guest leading to DoS",
          "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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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2016-5403"
        },
        {
          "category": "external",
          "summary": "RHBZ#1358359",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1358359"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-5403",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-5403"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-5403",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-5403"
        }
      ],
      "release_date": "2016-07-27T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2016-09-27T16:01:25+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nNote: The procedure in the Solution section must be performed before this update will take effect.",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2016:1943"
        }
      ],
      "scores": [
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          "cvss_v2": {
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            "accessVector": "ADJACENT_NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:A/AC:M/Au:S/C:N/I:N/A:P",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.4,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.0"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "Qemu: virtio: unbounded memory allocation on host via guest leading to DoS"
    }
  ]
}


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