rhsa-2020_1288
Vulnerability from csaf_redhat
Published
2020-04-02 14:07
Modified
2024-11-15 08:28
Summary
Red Hat Security Advisory: haproxy security update

Notes

Topic
An update for haproxy is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Critical. 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 haproxy packages provide a reliable, high-performance network load balancer for TCP and HTTP-based applications. Security Fix(es): * haproxy: malformed HTTP/2 requests can lead to out-of-bounds writes (CVE-2020-11100) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, 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": [
            "the HAProxy project"
          ]
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        {
          "names": [
            "Felix Wilhelm"
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          "organization": "Google Project Zero",
          "summary": "Acknowledged by upstream."
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      "cve": "CVE-2020-11100",
      "cwe": {
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        "name": "Out-of-bounds Write"
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      "discovery_date": "2020-03-29T00:00:00+00:00",
      "ids": [
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          "text": "1819111"
        }
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          "category": "description",
          "text": "A flaw was found in the way HAProxy processed certain HTTP/2 request packets. This flaw allows an attacker to send crafted HTTP/2 request packets, which cause memory corruption, leading to a crash or potential remote arbitrary code execution with the permissions of the user running HAProxy.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "haproxy: malformed HTTP/2 requests can lead to out-of-bounds writes",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "HAProxy packages shipped with Red Hat Enterprise Linux 6 and 7 do not contain support for HTTP/2; therefore, they are not affected by this flaw.\n\nOpenShift Container Platform versions through 4.3 contain the vulnerable code; exploitation requires setting ROUTER_USE_HTTP2 in the OpenShift Ingress Operator, which is not currently possible. The impact of this vulnerability is therefore reduced in OCP 4.x, prior to version 4.4, to low.\n\nOpenShift Container Platform 3.11 added a configuration option to ose-haproxy-router that made enabling HTTP/2 support easy. However, it is not enabled by default on that version.",
          "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-2020-11100"
        },
        {
          "category": "external",
          "summary": "RHBZ#1819111",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1819111"
        },
        {
          "category": "external",
          "summary": "RHSB-haproxy",
          "url": "https://access.redhat.com/security/vulnerabilities/haproxy"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-11100",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-11100"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-11100",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11100"
        },
        {
          "category": "external",
          "summary": "https://bugs.chromium.org/p/project-zero/issues/detail?id=2023",
          "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=2023"
        },
        {
          "category": "external",
          "summary": "https://www.haproxy.com/blog/haproxy-1-8-http-2-hpack-decoder-vulnerability-fixed/",
          "url": "https://www.haproxy.com/blog/haproxy-1-8-http-2-hpack-decoder-vulnerability-fixed/"
        },
        {
          "category": "external",
          "summary": "https://www.mail-archive.com/haproxy@formilux.org/msg36876.html",
          "url": "https://www.mail-archive.com/haproxy@formilux.org/msg36876.html"
        }
      ],
      "release_date": "2020-04-02T13:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-02T14:07:54+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",
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            "AppStream-8.1.0.Z.MAIN.EUS:haproxy-debuginfo-0:1.8.15-6.el8_1.1.x86_64",
            "AppStream-8.1.0.Z.MAIN.EUS:haproxy-debugsource-0:1.8.15-6.el8_1.1.aarch64",
            "AppStream-8.1.0.Z.MAIN.EUS:haproxy-debugsource-0:1.8.15-6.el8_1.1.ppc64le",
            "AppStream-8.1.0.Z.MAIN.EUS:haproxy-debugsource-0:1.8.15-6.el8_1.1.s390x",
            "AppStream-8.1.0.Z.MAIN.EUS:haproxy-debugsource-0:1.8.15-6.el8_1.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2020:1288"
        },
        {
          "category": "workaround",
          "details": "This issue can be mitigated by not enabling support for HTTP/2 protocol. Upstream suggests that HTTP/2 can be enabled per front-end server by using the following documentation: https://www.haproxy.com/documentation/hapee/1-8r1/traffic-management/enable-http2-protocol/.\n\nYou can check if http2 is enabled by searching your haproxy configuration files for a line containing \u0027h2\u0027.\n\nTo mitigate this vulnerability in OpenShift Container Platform 3.11, keep HTTP/2 disabled as it is by default. You can verify if HTTP/2 support is enabled or not by following the instructions in following article: https://access.redhat.com/security/vulnerabilities/haproxy\n\nOn Red Hat Enterprise Linux 8, haproxy is confined by SELinux, which should mitigate remote arbitrary code execution.",
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "haproxy: malformed HTTP/2 requests can lead to out-of-bounds writes"
    }
  ]
}


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