ubuntu-cve-2021-28374
Vulnerability from osv_ubuntu
Published
2021-03-15 05:15
Modified
2026-04-22 07:39
Summary
Details

The Debian courier-authlib package before 0.71.1-2 for Courier Authentication Library creates a /run/courier/authdaemon directory with weak permissions, allowing an attacker to read user information. This may include a cleartext password in some configurations. In general, it includes the user's existence, uid and gids, home and/or Maildir directory, quota, and some type of password information (such as a hash).

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "courier-authdaemon",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-ldap",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-mysql",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-pipe",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-postgresql",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-sqlite",
            "binary_version": "0.66.4-3build1"
          },
          {
            "binary_name": "courier-authlib-userdb",
            "binary_version": "0.66.4-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "courier-authlib",
        "purl": "pkg:deb/ubuntu/courier-authlib@0.66.4-3build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.66.1-1",
        "0.66.4-2",
        "0.66.4-3",
        "0.66.4-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "courier-authdaemon",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-ldap",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-mysql",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-pipe",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-postgresql",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-sqlite",
            "binary_version": "0.68.0-4ubuntu0.1"
          },
          {
            "binary_name": "courier-authlib-userdb",
            "binary_version": "0.68.0-4ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "courier-authlib",
        "purl": "pkg:deb/ubuntu/courier-authlib@0.68.0-4ubuntu0.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.68.0-3ubuntu1",
        "0.68.0-4",
        "0.68.0-4build1",
        "0.68.0-4ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "courier-authdaemon",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-ldap",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-mysql",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-pipe",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-postgresql",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-sqlite",
            "binary_version": "0.69.0-2build3"
          },
          {
            "binary_name": "courier-authlib-userdb",
            "binary_version": "0.69.0-2build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "courier-authlib",
        "purl": "pkg:deb/ubuntu/courier-authlib@0.69.0-2build3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.69.0-2build2",
        "0.69.0-2build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "courier-authdaemon",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-ldap",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-mysql",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-pipe",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-postgresql",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-sqlite",
            "binary_version": "0.71.1-2build1"
          },
          {
            "binary_name": "courier-authlib-userdb",
            "binary_version": "0.71.1-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "courier-authlib",
        "purl": "pkg:deb/ubuntu/courier-authlib@0.71.1-2build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.71.1-2build1"
      ]
    }
  ],
  "aliases": [],
  "details": "The Debian courier-authlib package before 0.71.1-2 for Courier Authentication Library creates a /run/courier/authdaemon directory with weak permissions, allowing an attacker to read user information. This may include a cleartext password in some configurations. In general, it includes the user\u0027s existence, uid and gids, home and/or Maildir directory, quota, and some type of password information (such as a hash).",
  "id": "UBUNTU-CVE-2021-28374",
  "modified": "2026-04-22T07:39:57Z",
  "published": "2021-03-15T05:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-28374"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.debian.org/984810"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-28374"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-28374"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.