usn-4516-1
Vulnerability from osv_ubuntu
Published
2020-09-17 17:41
Modified
2026-04-27 14:11
Summary
gnupg2 vulnerability
Details

It was discovered that GnuPG signatures could be forged when the SHA-1 algorithm is being used. This update removes validating signatures based on SHA-1 that were generated after 2019-01-19. In environments where this is still required, a new option --allow-weak-key-signatures can be used to revert this behaviour.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2019-14855",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dirmngr",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gnupg",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gnupg-agent",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gnupg-l10n",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gnupg-utils",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gnupg2",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpg",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpg-agent",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpg-wks-client",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpg-wks-server",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgconf",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgsm",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgv",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgv-static",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgv-win32",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "gpgv2",
            "binary_version": "2.2.4-1ubuntu1.3"
          },
          {
            "binary_name": "scdaemon",
            "binary_version": "2.2.4-1ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "gnupg2",
        "purl": "pkg:deb/ubuntu/gnupg2@2.2.4-1ubuntu1.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.4-1ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.15-1ubuntu8",
        "2.2.4-1ubuntu1",
        "2.2.4-1ubuntu1.1",
        "2.2.4-1ubuntu1.2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that GnuPG signatures could be forged when the SHA-1\nalgorithm is being used. This update removes validating signatures based on\nSHA-1 that were generated after 2019-01-19. In environments where this is\nstill required, a new option --allow-weak-key-signatures can be used to\nrevert this behaviour.\n",
  "id": "USN-4516-1",
  "modified": "2026-04-27T14:11:25Z",
  "published": "2020-09-17T17:41:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4516-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-14855"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "gnupg2 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2019-14855"
  ]
}



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