usn-4995-1
Vulnerability from osv_ubuntu
Published
2021-06-22 16:43
Modified
2026-04-22 07:36
Summary
thunderbird vulnerabilities
Details

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, spoof the UI, bypass security restrictions, or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981, CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998, CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)

It was discovered that extensions could open popup windows with control of the window title in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to spoof a website and trick the user into providing credentials. (CVE-2021-23984)

Multiple security issues were discovered in Thunderbird's OpenPGP integration. If a user were tricked into importing a specially crafted key in some circumstances, an attacker could potentially exploit this to cause a denial of service (inability to send encrypted email) or confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)

A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995)

It was discovered that Thunderbird mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002)

It was discovered that Thunderbird wrote signatures to disk and read them back during verification. A local attacker could potentially exploit this to replace the data with another signature file. (CVE-2021-29948)

It was discovered that Thunderbird might load an alternative OTR library. If a user were tricked into copying a specially crafted library to one of Thunderbird's search paths, an attacker could potentially exploit this to execute arbitrary code. (CVE-2021-29949)

It was discovered that secret keys imported into Thunderbird were stored unencrypted. A local attacker could potentially exploit this to obtain private keys. (CVE-2021-29956)

It was discovered that Thunderbird did not indicate when an inline signed or encrypted message contained additional unprotected parts. (CVE-2021-29957)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-23961",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23981",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23982",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23984",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23987",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23991",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23992",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23993",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23994",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23995",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23998",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23999",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-24002",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29945",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29946",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29948",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29949",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29956",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29957",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29967",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:78.11.0+build1-0ubuntu0.20.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:78.11.0+build1-0ubuntu0.20.04.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:78.11.0+build1-0ubuntu0.20.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:68.1.2+build1-0ubuntu1",
        "1:68.1.2+build1-0ubuntu2",
        "1:68.2.1+build1-0ubuntu1",
        "1:68.2.2+build1-0ubuntu1",
        "1:68.3.0+build2-0ubuntu1",
        "1:68.3.1+build1-0ubuntu2",
        "1:68.4.1+build1-0ubuntu1",
        "1:68.4.2+build2-0ubuntu1",
        "1:68.5.0+build1-0ubuntu1",
        "1:68.6.0+build2-0ubuntu1",
        "1:68.7.0+build1-0ubuntu1",
        "1:68.7.0+build1-0ubuntu2",
        "1:68.8.0+build2-0ubuntu0.20.04.2",
        "1:68.10.0+build1-0ubuntu0.20.04.1",
        "1:78.7.1+build1-0ubuntu0.20.04.1",
        "1:78.8.1+build1-0ubuntu0.20.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Multiple security issues were discovered in Thunderbird. If a user were\ntricked into opening a specially crafted website in a browsing context, an\nattacker could potentially exploit these to cause a denial of service,\nobtain sensitive information, spoof the UI, bypass security restrictions,\nor execute arbitrary code. (CVE-2021-23961, CVE-2021-23981,\nCVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998,\nCVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)\n\nIt was discovered that extensions could open popup windows with control\nof the window title in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to spoof a website and trick the user into providing\ncredentials. (CVE-2021-23984)\n\nMultiple security issues were discovered in Thunderbird\u0027s OpenPGP\nintegration. If a user were tricked into importing a specially crafted\nkey in some circumstances, an attacker could potentially exploit this\nto cause a denial of service (inability to send encrypted email) or\nconfuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)\n\nA use-after-free was discovered when Responsive Design Mode was\nenabled. If a user were tricked into opening a specially crafted\nwebsite with Responsive Design Mode enabled, an attacker could\npotentially exploit this to cause a denial of service, or execute\narbitrary code. (CVE-2021-23995)\n\nIt was discovered that Thunderbird mishandled ftp URLs with encoded\nnewline characters. If a user were tricked into clicking on a specially\ncrafted link, an attacker could potentially exploit this to send arbitrary\nFTP commands. (CVE-2021-24002)\n\nIt was discovered that Thunderbird wrote signatures to disk and read them\nback during verification. A local attacker could potentially exploit this\nto replace the data with another signature file. (CVE-2021-29948)\n\nIt was discovered that Thunderbird might load an alternative OTR\nlibrary. If a user were tricked into copying a specially crafted\nlibrary to one of Thunderbird\u0027s search paths, an attacker could\npotentially exploit this to execute arbitrary code. (CVE-2021-29949)\n\nIt was discovered that secret keys imported into Thunderbird were\nstored unencrypted. A local attacker could potentially exploit this to\nobtain private keys. (CVE-2021-29956)\n\nIt was discovered that Thunderbird did not indicate when an inline signed\nor encrypted message contained additional unprotected parts.\n(CVE-2021-29957)\n",
  "id": "USN-4995-1",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-06-22T16:43:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4995-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23961"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23981"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23982"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23984"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23987"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23991"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23992"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23993"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23994"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23995"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23998"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23999"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-24002"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29945"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29946"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29948"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29949"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29956"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29957"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29967"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "thunderbird vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-23961",
    "UBUNTU-CVE-2021-23981",
    "UBUNTU-CVE-2021-23982",
    "UBUNTU-CVE-2021-23984",
    "UBUNTU-CVE-2021-23987",
    "UBUNTU-CVE-2021-23991",
    "UBUNTU-CVE-2021-23992",
    "UBUNTU-CVE-2021-23993",
    "UBUNTU-CVE-2021-23994",
    "UBUNTU-CVE-2021-23995",
    "UBUNTU-CVE-2021-23998",
    "UBUNTU-CVE-2021-23999",
    "UBUNTU-CVE-2021-24002",
    "UBUNTU-CVE-2021-29945",
    "UBUNTU-CVE-2021-29946",
    "UBUNTU-CVE-2021-29948",
    "UBUNTU-CVE-2021-29949",
    "UBUNTU-CVE-2021-29956",
    "UBUNTU-CVE-2021-29957",
    "UBUNTU-CVE-2021-29967"
  ]
}



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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

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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.