rhsa-2019_2862
Vulnerability from csaf_redhat
Published
2019-09-23 09:19
Modified
2024-11-15 04:09
Summary
Red Hat Security Advisory: kernel-alt security update

Notes

Topic
An update for kernel-alt is now available for Red Hat Enterprise Linux 7. 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
The kernel-alt packages provide the Linux kernel version 4.x. Security Fix(es): * A buffer overflow flaw was found in the way Linux kernel's vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. (CVE-2019-14835)
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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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Peter Pi"
          ],
          "organization": "Tencent Blade Team"
        }
      ],
      "cve": "CVE-2019-14835",
      "cwe": {
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        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "discovery_date": "2019-09-10T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "1750727"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A buffer overflow flaw was found in the way Linux kernel\u0027s vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. In the worst case (and likely most common virtualization) scenario this flaw affects KVM/qemu hypervisor enabled  hosts running Linux guests.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: vhost-net: guest to host kernel escape during migration",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/kernel-vhost",
          "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"
        }
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-14835"
        },
        {
          "category": "external",
          "summary": "RHBZ#1750727",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1750727"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-14835",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-14835"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-14835",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14835"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/kernel-vhost",
          "url": "https://access.redhat.com/security/vulnerabilities/kernel-vhost"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2019/09/17/1",
          "url": "https://www.openwall.com/lists/oss-security/2019/09/17/1"
        }
      ],
      "release_date": "2019-09-17T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2019-09-23T09:19:46+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\nThe system must be rebooted for this update to take effect.",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2019:2862"
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          "category": "workaround",
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      "scores": [
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H",
            "version": "3.0"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: vhost-net: guest to host kernel escape during migration"
    }
  ]
}


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