{
  "threat_severity" : "Moderate",
  "public_date" : "2020-09-04T00:00:00Z",
  "bugzilla" : {
    "description" : "gnutls: Heap buffer overflow in handshake with no_renegotiation alert sent",
    "id" : "1872021",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1872021"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-20",
  "details" : [ "An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.", "A flaw was found in GnuTLS, where the server can trigger the client to run into heap buffer overflow if a no_renegotiation alert is sent in an unexpected timing. This flaw allows the client to crash at the session deinitialization timing. The highest threat from this vulnerability is to system availability." ],
  "statement" : "This issue only affects TLS 1.3 implementation of GnuTLS which is available on GnuTLS 3.6.x branch. Therefore only GnuTLS packages shipped with Red Hat Enterprise Linux 8 are affected by this flaw.",
  "acknowledgement" : "Red Hat would like to thank the GnuTLS project for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2020-12-15T00:00:00Z",
    "advisory" : "RHSA-2020:5483",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.14-7.el8_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2020-12-15T00:00:00Z",
    "advisory" : "RHSA-2020:5483",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.14-7.el8_3"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 5",
    "fix_state" : "Not affected",
    "package_name" : "gnutls",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "gnutls",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "gnutls",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2020-24659\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-24659\nhttps://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04" ],
  "name" : "CVE-2020-24659",
  "csaw" : false
}