{
  "threat_severity" : "Moderate",
  "public_date" : "2019-09-13T00:00:00Z",
  "bugzilla" : {
    "description" : "haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated \"chunked\" value",
    "id" : "1759697",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1759697"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-444",
  "details" : [ "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)." ],
  "statement" : "To exploit this vulnerability a vulnerable backend server is required. In particular the server should incorrectly parse the Transfer-Encoding HTTP header.\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.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2020-04-28T00:00:00Z",
    "advisory" : "RHSA-2020:1725",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "haproxy-0:1.8.23-3.el8"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 3.11",
    "release_date" : "2020-04-07T00:00:00Z",
    "advisory" : "RHSA-2020:1287",
    "cpe" : "cpe:/a:redhat:openshift:3.11::el7",
    "package" : "haproxy-0:1.8.23-3.el7"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.4",
    "release_date" : "2020-05-04T00:00:00Z",
    "advisory" : "RHSA-2020:1936",
    "cpe" : "cpe:/a:redhat:openshift:4.4::el7",
    "package" : "haproxy-0:2.0.13-3.el7"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7",
    "release_date" : "2020-05-26T00:00:00Z",
    "advisory" : "RHSA-2020:2265",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:3::el7",
    "package" : "rh-haproxy18-haproxy-0:1.8.24-2.el7"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS",
    "release_date" : "2020-05-26T00:00:00Z",
    "advisory" : "RHSA-2020:2265",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:3::el7",
    "package" : "rh-haproxy18-haproxy-0:1.8.24-2.el7"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS",
    "release_date" : "2020-05-26T00:00:00Z",
    "advisory" : "RHSA-2020:2265",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:3::el7",
    "package" : "rh-haproxy18-haproxy-0:1.8.24-2.el7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 3.10",
    "fix_state" : "Will not fix",
    "package_name" : "haproxy",
    "cpe" : "cpe:/a:redhat:openshift:3.10"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 3.9",
    "fix_state" : "Will not fix",
    "package_name" : "haproxy",
    "cpe" : "cpe:/a:redhat:openshift:3.9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2019-18277\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-18277" ],
  "name" : "CVE-2019-18277",
  "mitigation" : {
    "value" : "- 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",
    "lang" : "en:us"
  },
  "csaw" : false
}