Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2019-1547

Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2019-1547
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 04:22 UTC · Revision 1

Source evidence

CVE-2019-1547

core-osv · Original source

Published 10 Sept 2019, 17:15 UTC

osv:CVE-2019-1547

Complete source record

{
  "id": "24ec342fc44e0cab97ebd9d86dd2b7fef26c051a2ba93ec4a6a53b22bbddcc93",
  "url": "https://osv.dev/vulnerability/CVE-2019-1547",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-1547",
    "summary": "Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).",
    "evidence": "osv:CVE-2019-1547",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2019-1547",
      "aliases": [
        "CVE-2019-1547"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openssl/openssl",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
                },
                {
                  "last_affected": "e818b74be2170fbe957a07b0da4401c2b694b3b8"
                },
                {
                  "introduced": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
                },
                {
                  "last_affected": "7ea5bd2b52d0e81eaef3d109b3b12545306f201c"
                },
                {
                  "introduced": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
                },
                {
                  "last_affected": "e04bd3433fd84e1861bf258ea37928d9845e6a86"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.2"
                      },
                      {
                        "last_affected": "1.0.2s"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.0"
                      },
                      {
                        "last_affected": "1.1.0k"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.1"
                      },
                      {
                        "last_affected": "1.1.1c"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "OpenSSL_1_1_1w",
            "OpenSSL_1_0_2u",
            "OpenSSL_1_1_0l"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-1547.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.133329732Z",
      "provider": "osv",
      "references": [
        "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=21c856b75d81eff61aa63b4f036bb64a85bf6d46",
        "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30c22fa8b1d840036b8e203585738df62a03cec8",
        "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=7c1709c2da5414f5b6133d00a03fc8c5bf996c7a",
        "https://kc.mcafee.com/corporate/index?page=content&id=SB10365",
        "https://lists.debian.org/debian-lts-announce/2019/09/msg00026.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GY6SNRJP2S7Y42GIIDO3HXPNMDYN2U3A/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZN4VVQJ3JDCHGIHV4Y2YTXBYQZ6PWQ7E/",
        "https://seclists.org/bugtraq/2019/Oct/0",
        "https://seclists.org/bugtraq/2019/Oct/1",
        "https://support.f5.com/csp/article/K73422160?utm_source=f5support&amp%3Butm_medium=RSS",
        "https://usn.ubuntu.com/4376-1/",
        "https://usn.ubuntu.com/4376-2/",
        "https://usn.ubuntu.com/4504-1/",
        "https://www.oracle.com/security-alerts/cpuapr2020.html",
        "https://www.oracle.com/security-alerts/cpujan2020.html",
        "https://www.oracle.com/security-alerts/cpujul2020.html",
        "https://www.oracle.com/security-alerts/cpuoct2020.html",
        "https://www.tenable.com/security/tns-2019-08",
        "https://www.tenable.com/security/tns-2019-09",
        "https://arxiv.org/abs/1909.01785",
        "https://seclists.org/bugtraq/2019/Sep/25",
        "https://security.gentoo.org/glsa/201911-04",
        "https://security.netapp.com/advisory/ntap-20190919-0002/",
        "https://security.netapp.com/advisory/ntap-20200122-0002/",
        "https://security.netapp.com/advisory/ntap-20200416-0003/",
        "https://security.netapp.com/advisory/ntap-20240621-0006/",
        "https://www.debian.org/security/2019/dsa-4539",
        "https://www.debian.org/security/2019/dsa-4540",
        "https://www.openssl.org/news/secadv/20190910.txt",
        "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-1547",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429704,
  "published_at": "2019-09-10T17:15:11.75+00:00"
}