rhsa-2020_1725
Vulnerability from csaf_redhat
Published
2020-04-28 15:37
Modified
2024-11-15 04:19
Summary
Red Hat Security Advisory: haproxy security, bug fix, and enhancement 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 Moderate. 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. The following packages have been upgraded to a later upstream version: haproxy (1.8.23). (BZ#1774745) Security Fix(es): * haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated "chunked" value (CVE-2019-18277) * haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks (CVE-2019-19330) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.2 Release Notes linked from 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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        "text": "An update for haproxy is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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.",
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        "text": "The haproxy packages provide a reliable, high-performance network load balancer for TCP and HTTP-based applications.\n\nThe following packages have been upgraded to a later upstream version: haproxy (1.8.23). (BZ#1774745)\n\nSecurity Fix(es):\n\n* haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated \"chunked\" value (CVE-2019-18277)\n\n* haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks (CVE-2019-19330)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.2 Release Notes linked from the References section.",
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  "vulnerabilities": [
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      "cve": "CVE-2019-18277",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)"
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      "discovery_date": "2019-10-08T00:00:00+00:00",
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          "text": "1759697"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the \"chunked\" value were not being correctly rejected. The impact was limited but if combined with the \"http-reuse always\" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).",
          "title": "Vulnerability description"
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          "text": "haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated \"chunked\" value",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "To exploit this vulnerability a vulnerable backend server is required. In particular the server should incorrectly parse the Transfer-Encoding HTTP header.\n\nThis issue did not affect the versions of haproxy as shipped with Red Hat Enterprise Linux 6, and 7 as they did not include support for `http-reuse` option.",
          "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-2019-18277"
        },
        {
          "category": "external",
          "summary": "RHBZ#1759697",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1759697"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-18277",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-18277"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-18277",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18277"
        }
      ],
      "release_date": "2019-09-13T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-28T15:37:42+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",
          "product_ids": [
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            "AppStream-8.2.0.GA:haproxy-debugsource-0:1.8.23-3.el8.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2020:1725"
        },
        {
          "category": "workaround",
          "details": "- Reconsider the use of `http-reuse always` if possible\n- Disable HTTP Keep-Alive (also called HTTP Connection reuse) in the backend\n- Fix the backend server to correctly parse Transfer-Encoding/Content-Length headers",
          "product_ids": [
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L",
            "version": "3.0"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated \"chunked\" value"
    },
    {
      "cve": "CVE-2019-19330",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "discovery_date": "2019-11-27T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1777584"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Support for HTTP/2 protocol was added to haproxy in version 1.8, therefore previous versions are not affected by this flaw.\n\nThe version of haproxy shipped in OpenShift Container Platform 4 contains the vulnerable code, however 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 OpenShift Container Platform 4 to Low.",
          "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"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-19330"
        },
        {
          "category": "external",
          "summary": "RHBZ#1777584",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1777584"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-19330",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-19330"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-19330",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19330"
        }
      ],
      "release_date": "2019-11-25T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-28T15:37:42+00:00",
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks"
    }
  ]
}


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