usn-7292-1
Vulnerability from osv_ubuntu
Published
2025-02-25 12:33
Modified
2026-04-27 14:11
Summary
Several security issues were fixed in Dropbear
Details

Manfred Kaiser discovered that Dropbear through 2020.81 does not properly check the available authentication methods in the client-side SSH code. An attacker could use this vulnerability to gain unauthorized access to remote systems. (CVE-2021-36369)

Fabian Bäumer, Marcus Brinkmann, and Jörg Schwenk discovered that the SSH transport protocol implementation in Dropbear had weak integrity checks. An attacker could use this vulnerability to bypass security features like encryption and integrity checks. (CVE-2023-48795)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-36369",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2023-48795",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dropbear",
            "binary_version": "2017.75-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-bin",
            "binary_version": "2017.75-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-initramfs",
            "binary_version": "2017.75-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-run",
            "binary_version": "2017.75-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "dropbear",
        "purl": "pkg:deb/ubuntu/dropbear@2017.75-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2017.75-3ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2017.75-2",
        "2017.75-3build1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-36369",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2023-48795",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dropbear",
            "binary_version": "2019.78-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-bin",
            "binary_version": "2019.78-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-initramfs",
            "binary_version": "2019.78-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dropbear-run",
            "binary_version": "2019.78-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "dropbear",
        "purl": "pkg:deb/ubuntu/dropbear@2019.78-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2019.78-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2019.78-2build1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-36369",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2023-48795",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dropbear",
            "binary_version": "2020.81-5ubuntu0.1"
          },
          {
            "binary_name": "dropbear-bin",
            "binary_version": "2020.81-5ubuntu0.1"
          },
          {
            "binary_name": "dropbear-initramfs",
            "binary_version": "2020.81-5ubuntu0.1"
          },
          {
            "binary_name": "dropbear-run",
            "binary_version": "2020.81-5ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "dropbear",
        "purl": "pkg:deb/ubuntu/dropbear@2020.81-5ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2020.81-5ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2020.81-3",
        "2020.81-4",
        "2020.81-5"
      ]
    }
  ],
  "aliases": [],
  "details": "Manfred Kaiser discovered that Dropbear through 2020.81 does not properly\ncheck the available authentication methods in the client-side SSH code.\nAn attacker could use this vulnerability to gain unauthorized access to\nremote systems. (CVE-2021-36369)\n\nFabian B\u00e4umer, Marcus Brinkmann, and J\u00f6rg Schwenk discovered that the SSH\ntransport protocol implementation in Dropbear had weak integrity checks.\nAn attacker could use this vulnerability to bypass security features\nlike encryption and integrity checks. (CVE-2023-48795)\n",
  "id": "USN-7292-1",
  "modified": "2026-04-27T14:11:40Z",
  "published": "2025-02-25T12:33:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7292-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-36369"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-48795"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Several security issues were fixed in Dropbear",
  "upstream": [
    "UBUNTU-CVE-2021-36369",
    "UBUNTU-CVE-2023-48795"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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