rhsa-2021_2077
Vulnerability from csaf_redhat
Published
2021-05-20 19:33
Modified
2024-11-05 23:36
Summary
Red Hat Security Advisory: openvswitch security update

Notes

Topic
An update for openvswitch is now available in Fast Datapath 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
Open vSwitch provides standard network bridging functions and support for the OpenFlow protocol for remote per-flow control of traffic. Security Fix(es): * lldpd: buffer overflow in the lldp_decode function in daemon/protocols/lldp.c (CVE-2015-8011) * openvswitch: limitation in the OVS packet parsing in userspace leads to DoS (CVE-2020-35498) * lldp/openvswitch: denial of service via externally triggered memory leak (CVE-2020-27827)
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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        "text": "Open vSwitch provides standard network bridging functions and support for\nthe OpenFlow protocol for remote per-flow control of traffic.\n\nSecurity Fix(es):\n\n* lldpd: buffer overflow in the lldp_decode function in daemon/protocols/lldp.c\n(CVE-2015-8011)\n\n* openvswitch: limitation in the OVS packet parsing in userspace leads to DoS\n(CVE-2020-35498)\n\n* lldp/openvswitch: denial of service via externally triggered memory leak\n(CVE-2020-27827)",
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        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
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          "text": "A buffer overflow was found in the lldp_decode function in daemon/protocols/lldp.c in lldpd. This flaw allows remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via vectors involving large management addresses and TLV boundaries. This threatens the system\u0027s confidentiality, integrity, and availability.",
          "title": "Vulnerability description"
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          "text": "lldpd: buffer overflow in the lldp_decode function in daemon/protocols/lldp.c",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "The lldpd package as shipped with Red Hat Enterprise Linux 8 is not affected by this flaw because it has already received the patch. The flaw affects versions before 0.8.0 and the shipped version is 1.0.1+. In addition, Red Hat Virtualization 4.3 manager appliance is out of support scope and therefore no fix for it will be delivered.",
          "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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      "threats": [
        {
          "category": "impact",
          "details": "Important"
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      ],
      "title": "lldpd: buffer overflow in the lldp_decode function in daemon/protocols/lldp.c"
    },
    {
      "cve": "CVE-2020-27827",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2021-01-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1921438"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in multiple versions of Open vSwitch. Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "lldp/openvswitch: denial of service via externally triggered memory leak",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat OpenStack Platform 13\u0027s openvswitch package will receive it\u0027s fixes from Fast Datapath.",
          "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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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-27827"
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          "category": "external",
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-27827",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-27827"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-27827",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27827"
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        {
          "category": "external",
          "summary": "https://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.html",
          "url": "https://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.html"
        }
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      "release_date": "2021-01-13T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2021-05-20T19:33:01+00:00",
          "details": "For details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "category": "impact",
          "details": "Moderate"
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      "title": "lldp/openvswitch: denial of service via externally triggered memory leak"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Joakim Hindersson \u003cjoakim.hindersson@elastx.se\u003e"
          ]
        }
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      "cve": "CVE-2020-35498",
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      },
      "discovery_date": "2020-12-03T00:00:00+00:00",
      "ids": [
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          "text": "1908845"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "openvswitch: limitation in the OVS packet parsing in userspace leads to DoS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat OpenStack Platform 13\u0027s openvswitch package will receive it\u0027s fixes from Fast Datapath.",
          "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-2020-35498"
        },
        {
          "category": "external",
          "summary": "RHBZ#1908845",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1908845"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-35498",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-35498"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-35498",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-35498"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2021/02/10/4",
          "url": "https://www.openwall.com/lists/oss-security/2021/02/10/4"
        }
      ],
      "release_date": "2021-02-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-05-20T19:33:01+00:00",
          "details": "For details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "7Server-RH7-Fast-Datapath:openvswitch-debuginfo-0:2.9.9-1.el7fdp.x86_64",
            "7Server-RH7-Fast-Datapath:openvswitch-devel-0:2.9.9-1.el7fdp.ppc64le",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2077"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "7Server-RH7-Fast-Datapath:python-openvswitch-0:2.9.9-1.el7fdp.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "openvswitch: limitation in the OVS packet parsing in userspace leads to DoS"
    }
  ]
}


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