usn-4995-2
Vulnerability from osv_ubuntu
Published
2021-06-25 14:44
Modified
2026-04-22 07:36
Summary
thunderbird vulnerabilities
Details

USN-4995-1 fixed vulnerabilities in Thunderbird. This update provides the corresponding updates for Ubuntu 18.04 LTS.

Original advisory 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:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:78.11.0+build1-0ubuntu0.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:78.11.0+build1-0ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:78.11.0+build1-0ubuntu0.18.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:52.4.0+build1-0ubuntu2",
        "1:52.6.0+build1-0ubuntu1",
        "1:52.7.0+build1-0ubuntu1",
        "1:52.8.0+build1-0ubuntu0.18.04.1",
        "1:52.9.1+build3-0ubuntu0.18.04.1",
        "1:60.2.1+build1-0ubuntu0.18.04.2",
        "1:60.4.0+build2-0ubuntu0.18.04.1",
        "1:60.5.1+build2-0ubuntu0.18.04.1",
        "1:60.6.1+build2-0ubuntu0.18.04.1",
        "1:60.7.0+build1-0ubuntu0.18.04.1",
        "1:60.7.1+build1-0ubuntu0.18.04.1",
        "1:60.7.2+build2-0ubuntu0.18.04.1",
        "1:60.8.0+build1-0ubuntu0.18.04.1",
        "1:60.9.0+build1-0ubuntu0.18.04.1",
        "1:68.2.1+build1-0ubuntu0.18.04.1",
        "1:68.2.2+build1-0ubuntu0.18.04.1",
        "1:68.4.1+build1-0ubuntu0.18.04.1",
        "1:68.7.0+build1-0ubuntu0.18.04.1",
        "1:68.8.0+build2-0ubuntu0.18.04.2",
        "1:68.10.0+build1-0ubuntu0.18.04.1",
        "1:78.8.1+build1-0ubuntu0.18.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-4995-1 fixed vulnerabilities in Thunderbird. This update provides\nthe corresponding updates for Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Multiple security issues were discovered in Thunderbird. If a user were\n tricked into opening a specially crafted website in a browsing context, an\n attacker could potentially exploit these to cause a denial of service,\n obtain sensitive information, spoof the UI, bypass security restrictions,\n or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981,\n CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998,\n CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)\n \n It was discovered that extensions could open popup windows with control\n of the window title in some circumstances. If a user were tricked into\n installing a specially crafted extension, an attacker could potentially\n exploit this to spoof a website and trick the user into providing\n credentials. (CVE-2021-23984)\n \n Multiple security issues were discovered in Thunderbird\u0027s OpenPGP\n integration. If a user were tricked into importing a specially crafted\n key in some circumstances, an attacker could potentially exploit this\n to cause a denial of service (inability to send encrypted email) or\n confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)\n \n A use-after-free was discovered when Responsive Design Mode was\n enabled. If a user were tricked into opening a specially crafted\n website with Responsive Design Mode enabled, an attacker could\n potentially exploit this to cause a denial of service, or execute\n arbitrary code. (CVE-2021-23995)\n \n It was discovered that Thunderbird mishandled ftp URLs with encoded\n newline characters. If a user were tricked into clicking on a specially\n crafted link, an attacker could potentially exploit this to send arbitrary\n FTP commands. (CVE-2021-24002)\n \n It was discovered that Thunderbird wrote signatures to disk and read them\n back during verification. A local attacker could potentially exploit this\n to replace the data with another signature file. (CVE-2021-29948)\n \n It was discovered that Thunderbird might load an alternative OTR\n library. If a user were tricked into copying a specially crafted\n library to one of Thunderbird\u0027s search paths, an attacker could\n potentially exploit this to execute arbitrary code. (CVE-2021-29949)\n \n It was discovered that secret keys imported into Thunderbird were\n stored unencrypted. A local attacker could potentially exploit this to\n obtain private keys. (CVE-2021-29956)\n \n It was discovered that Thunderbird did not indicate when an inline signed\n or encrypted message contained additional unprotected parts.\n (CVE-2021-29957)\n",
  "id": "USN-4995-2",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-06-25T14:44:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4995-2"
    },
    {
      "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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Nomenclature

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Detection rules are retrieved from Rulezet.