{
  "threat_severity" : "Important",
  "public_date" : "2021-03-16T00:00:00Z",
  "bugzilla" : {
    "description" : "nettle: Out of bounds memory access in signature verification",
    "id" : "1942533",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1942533"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-787",
  "details" : [ "A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.", "A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability." ],
  "statement" : "* Although Red Hat OpenStack's dibbler package bundles nettle, it does not include the flawed functionality and is therefore unaffected.",
  "acknowledgement" : "Red Hat would like to thank Niels Möller for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 7",
    "release_date" : "2021-04-08T00:00:00Z",
    "advisory" : "RHSA-2021:1145",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7",
    "package" : "nettle-0:2.7.1-9.el7_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.3 Advanced Update Support",
    "release_date" : "2021-07-19T00:00:00Z",
    "advisory" : "RHSA-2021:2760",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.3",
    "package" : "nettle-0:2.7.1-9.el7_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Advanced Update Support",
    "release_date" : "2021-07-15T00:00:00Z",
    "advisory" : "RHSA-2021:2758",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.4",
    "package" : "nettle-0:2.7.1-9.el7_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Telco Extended Update Support",
    "release_date" : "2021-07-15T00:00:00Z",
    "advisory" : "RHSA-2021:2758",
    "cpe" : "cpe:/o:redhat:rhel_tus:7.4",
    "package" : "nettle-0:2.7.1-9.el7_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions",
    "release_date" : "2021-07-15T00:00:00Z",
    "advisory" : "RHSA-2021:2758",
    "cpe" : "cpe:/o:redhat:rhel_e4s:7.4",
    "package" : "nettle-0:2.7.1-9.el7_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)",
    "release_date" : "2021-06-09T00:00:00Z",
    "advisory" : "RHSA-2021:2356",
    "cpe" : "cpe:/o:redhat:rhel_aus:7.6",
    "package" : "nettle-0:2.7.1-9.el7_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.6 Telco Extended Update Support",
    "release_date" : "2021-06-09T00:00:00Z",
    "advisory" : "RHSA-2021:2356",
    "cpe" : "cpe:/o:redhat:rhel_tus:7.6",
    "package" : "nettle-0:2.7.1-9.el7_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions",
    "release_date" : "2021-06-09T00:00:00Z",
    "advisory" : "RHSA-2021:2356",
    "cpe" : "cpe:/o:redhat:rhel_e4s:7.6",
    "package" : "nettle-0:2.7.1-9.el7_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7.7 Extended Update Support",
    "release_date" : "2021-06-07T00:00:00Z",
    "advisory" : "RHSA-2021:2280",
    "cpe" : "cpe:/o:redhat:rhel_eus:7.7",
    "package" : "nettle-0:2.7.1-9.el7_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-04-14T00:00:00Z",
    "advisory" : "RHSA-2021:1206",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.14-8.el8_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-04-14T00:00:00Z",
    "advisory" : "RHSA-2021:1206",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "nettle-0:3.4.1-4.el8_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-04-14T00:00:00Z",
    "advisory" : "RHSA-2021:1206",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.14-8.el8_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2021-04-14T00:00:00Z",
    "advisory" : "RHSA-2021:1206",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "nettle-0:3.4.1-4.el8_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.1 Extended Update Support",
    "release_date" : "2021-04-19T00:00:00Z",
    "advisory" : "RHSA-2021:1245",
    "cpe" : "cpe:/a:redhat:rhel_eus:8.1",
    "package" : "gnutls-0:3.6.8-10.el8_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.1 Extended Update Support",
    "release_date" : "2021-04-19T00:00:00Z",
    "advisory" : "RHSA-2021:1245",
    "cpe" : "cpe:/a:redhat:rhel_eus:8.1",
    "package" : "nettle-0:3.4.1-2.el8_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Extended Update Support",
    "release_date" : "2021-04-19T00:00:00Z",
    "advisory" : "RHSA-2021:1246",
    "cpe" : "cpe:/a:redhat:rhel_eus:8.2",
    "package" : "gnutls-0:3.6.8-12.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Extended Update Support",
    "release_date" : "2021-04-19T00:00:00Z",
    "advisory" : "RHSA-2021:1246",
    "cpe" : "cpe:/a:redhat:rhel_eus:8.2",
    "package" : "nettle-0:3.4.1-2.el8_2"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "nettle",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenStack Platform 10 (Newton)",
    "fix_state" : "Not affected",
    "package_name" : "nettle",
    "cpe" : "cpe:/a:redhat:openstack:10"
  }, {
    "product_name" : "Red Hat OpenStack Platform 13 (Queens)",
    "fix_state" : "Not affected",
    "package_name" : "nettle",
    "cpe" : "cpe:/a:redhat:openstack:13"
  }, {
    "product_name" : "Red Hat OpenStack Platform 16.1",
    "fix_state" : "Not affected",
    "package_name" : "nettle",
    "cpe" : "cpe:/a:redhat:openstack:16.1"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2021-20305\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20305\nhttps://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009457.html" ],
  "name" : "CVE-2021-20305",
  "csaw" : false
}