{
  "threat_severity" : "Moderate",
  "public_date" : "2016-07-05T00:00:00Z",
  "bugzilla" : {
    "description" : "httpd: X509 client certificate authentication bypass using HTTP/2",
    "id" : "1352476",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1352476"
  },
  "cvss" : {
    "cvss_base_score" : "5.8",
    "cvss_scoring_vector" : "AV:N/AC:M/Au:N/C:P/I:P/A:N",
    "status" : "verified"
  },
  "cvss3" : {
    "cvss3_base_score" : "9.1",
    "cvss3_scoring_vector" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-287",
  "details" : [ "The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the \"SSLVerifyClient require\" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.", "A flaw was found in the way httpd performed client authentication using X.509 client certificates. When the HTTP/2 protocol was enabled, a remote attacker could use this flaw to access resources protected by certificate authentication without providing a valid client certificate." ],
  "acknowledgement" : "Red Hat would like to thank Apache Software Foundation for reporting this issue. Upstream acknowledges Erki Aring (Liewenthal Electronics Ltd) as the original reporter.",
  "affected_release" : [ {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 6",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el6",
    "package" : "httpd24-httpd-0:2.4.18-11.el6"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el6",
    "package" : "httpd24-httpd-0:2.4.18-11.el6"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el6",
    "package" : "httpd24-httpd-0:2.4.18-11.el6"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el7",
    "package" : "httpd24-httpd-0:2.4.18-11.el7"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el7",
    "package" : "httpd24-httpd-0:2.4.18-11.el7"
  }, {
    "product_name" : "Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS",
    "release_date" : "2016-07-18T00:00:00Z",
    "advisory" : "RHSA-2016:1420",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:2::el7",
    "package" : "httpd24-httpd-0:2.4.18-11.el7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Directory Server 8",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:directory_server:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat JBoss Core Services",
    "fix_state" : "Not affected",
    "package_name" : "jbcs-httpd24-httpd",
    "cpe" : "cpe:/a:redhat:jboss_core_services:1"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 5",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:5"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 6",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:6"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 6",
    "fix_state" : "Not affected",
    "package_name" : "httpd22",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:6"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Web Server 1",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_web_server:1"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Web Server 2",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_web_server:2"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Web Server 3",
    "fix_state" : "Not affected",
    "package_name" : "httpd",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_web_server:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2016-4979\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-4979\nhttp://httpd.apache.org/security/vulnerabilities_24.html#2.4.23" ],
  "name" : "CVE-2016-4979",
  "csaw" : false
}