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USN-4875-1 (UBUNTU-CVE-2020-7247)

Vulnerability from osv_ubuntu – Published: 2021-03-15 23:06 – Updated: 2026-06-29 10:52 – Source website
VLAI
Summary
opensmtpd vulnerabilities
Details

It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could possibly use this vulnerability to execute arbitrary commands as root. (CVE-2020-7247)

It was discovered that OpenSMTPD did not properly handle hardlinks under certain conditions. An unprivileged local attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 ESM. (CVE-2020-8793)

It was discovered that OpenSMTPD mishandled certain input. A remote, unauthenticated attacker could possibly use this vulnerability to execute arbitrary shell commands as any non-root user. This issue only affected Ubuntu 16.04 ESM. (CVE-2020-8794)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-7247",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "opensmtpd",
            "binary_version": "5.4.1p1-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "opensmtpd",
        "purl": "pkg:deb/ubuntu/opensmtpd@5.4.1p1-1ubuntu0.1~esm1?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.1p1-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.3p1-4",
        "5.4.1p1-1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-8793",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-8794",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "opensmtpd",
            "binary_version": "5.7.3p2-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "opensmtpd",
        "purl": "pkg:deb/ubuntu/opensmtpd@5.7.3p2-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.7.3p2-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.2p1-4",
        "5.7.3p1-1",
        "5.7.3p2-1",
        "5.7.3p2-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that OpenSMTPD incorrectly verified the sender\u0027s or\nreceiver\u0027s e-mail addresses under certain conditions. An attacker could\npossibly use this vulnerability to execute arbitrary commands as root.\n(CVE-2020-7247)\n\nIt was discovered that OpenSMTPD did not properly handle hardlinks under\ncertain conditions. An unprivileged local attacker could possibly use this\nissue to obtain sensitive information. This issue only affected Ubuntu\n16.04 ESM. (CVE-2020-8793)\n\nIt was discovered that OpenSMTPD mishandled certain input. A remote,\nunauthenticated attacker could possibly use this vulnerability to execute\narbitrary shell commands as any non-root user. This issue only affected\nUbuntu 16.04 ESM. (CVE-2020-8794)\n",
  "id": "USN-4875-1",
  "modified": "2026-06-29T10:52:49Z",
  "published": "2021-03-15T23:06:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4875-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-7247"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8793"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8794"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "opensmtpd vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-7247",
    "UBUNTU-CVE-2020-8793",
    "UBUNTU-CVE-2020-8794"
  ]
}



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