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Mozilla Thunderbird Security Advisories (MFSA2021-47, MFSA2021-49) - Windows

🗓️ 22 Nov 2022 00:00:00Reported by Copyright (C) 2022 Greenbone AGType 
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Mozilla Thunderbird Security Advisories (MFSA2021-47, MFSA2021-49) - Windows. Vulnerabilities include downgrade attack on SMTP STARTTLS connections, use-after-free in MessageTask, and validation message overlay. Successful exploitation allows arbitrary code execution, denial of service, sensitive information disclosure, and spoofing attack. Affected version: Mozilla Thunderbird version before 91.2 on Windows

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Code
# SPDX-FileCopyrightText: 2022 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:mozilla:thunderbird";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.826710");
  script_version("2025-11-14T15:41:06+0000");
  script_cve_id("CVE-2021-38502", "CVE-2021-38496", "CVE-2021-38497", "CVE-2021-38498",
                "CVE-2021-32810", "CVE-2021-38500", "CVE-2021-38501");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2025-11-14 15:41:06 +0000 (Fri, 14 Nov 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-11-04 19:29:00 +0000 (Thu, 04 Nov 2021)");
  script_tag(name:"creation_date", value:"2022-11-22 12:41:25 +0530 (Tue, 22 Nov 2022)");
  script_name("Mozilla Thunderbird Security Advisories (MFSA2021-47, MFSA2021-49) - Windows");

  script_tag(name:"summary", value:"Mozilla Thunderbird is prone to multiple vulnerabilities.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present
  on the target host.");

  script_tag(name:"insight", value:"Multiple flaws exist due to,

  - Downgrade attack on SMTP STARTTLS connections.

  - Use-after-free in MessageTask.

  - Validation message could have been overlaid on another origin.

  Please see the references for more information about the vulnerabilities.");

  script_tag(name:"impact", value:"Successful exploitation will allow
  attackers to execute arbitrary code, cause denial of service, disclose
  sensitive information and conduct spoofing attack on an affected system.");

  script_tag(name:"affected", value:"Mozilla Thunderbird version before
  91.2 on Windows.");

  script_tag(name:"solution", value:"Upgrade to Mozilla Thunderbird version 91.2
  or later, Please see the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"registry");
  script_xref(name:"URL", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2022 Greenbone AG");
  script_family("General");
  script_dependencies("gb_thunderbird_detect_win.nasl");
  script_mandatory_keys("Thunderbird/Win/Ver");
  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if(!infos = get_app_version_and_location(cpe:CPE, exit_no_version:TRUE))
  exit(0);

vers = infos["version"];
path = infos["location"];

if(version_is_less(version:vers, test_version:"91.2")) {
  report = report_fixed_ver(installed_version:vers, fixed_version:"91.2", install_path:path);
  security_message(port:0, data:report);
  exit(0);
}

exit(99);

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