rhsa-2019_1594
Vulnerability from csaf_redhat
Published
2019-06-25 09:20
Modified
2024-11-15 03:11
Summary
Red Hat Security Advisory: redhat-virtualization-host security update

Notes

Topic
An update for redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this updated 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 redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Security Fix(es): * Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service (CVE-2019-11477) * Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478) * kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479) For more details about the security issue(s), including the impact, a CVSS score, acknowledgements, and other related information, refer to the CVE page(s) listed in the References section.
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": [
            "Jonathan Looney"
          ],
          "organization": "Netflix Information Security"
        }
      ],
      "cve": "CVE-2019-11477",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2019-06-07T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1719123"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An integer overflow flaw was found in the way the Linux kernel\u0027s networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel\u0027s socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service",
          "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/tcpsack",
          "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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          "summary": "RHBZ#1719123",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719123"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-11477",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-11477"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-11477",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11477"
        },
        {
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          "summary": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310",
          "url": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310"
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          "summary": "https://www.openwall.com/lists/oss-security/2019/06/17/5",
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          "date": "2019-06-25T09:20:04+00:00",
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        {
          "category": "workaround",
          "details": "For mitigation, please refer to the Red Hat Knowledgebase article:  https://access.redhat.com/security/vulnerabilities/tcpsack",
          "product_ids": [
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.src",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-content-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-0:4.2-20190618.0.el7_6.src",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-image-update-0:4.2-20190618.0.el7_6.noarch",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-image-update-placeholder-0:4.2-11.1.el7.noarch",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.src",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-content-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-virtualization-host-image-update-placeholder-0:4.2-11.1.el7.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.0"
          },
          "products": [
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.src",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-release-virtualization-host-content-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-0:4.2-20190618.0.el7_6.src",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-image-update-0:4.2-20190618.0.el7_6.noarch",
            "7Server-7.6.EUS-RHV-4.2-Hypervisor-eus:redhat-virtualization-host-image-update-placeholder-0:4.2-11.1.el7.noarch",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.src",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-release-virtualization-host-content-0:4.2-11.1.el7.x86_64",
            "7Server-7.6.EUS-RHV-4.2-HypervisorBuild-eus:redhat-virtualization-host-image-update-placeholder-0:4.2-11.1.el7.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service"
    }
  ]
}


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