Mozilla Thunderbird < 91.3

critical Nessus Plugin ID 154875

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Synopsis

A mail client installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Thunderbird installed on the remote Windows host is prior to 91.3. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-50 advisory.

- The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. (CVE-2021-38503)

- Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures. Note:
This advisory was added on January 17, 2023 after discovering it was inadvertently left out of the original advisory. The fix was included in the original release of Thunderbird 91.3. (CVE-2021-43529)

- When interacting with an HTML input element's file picker dialog with <code>webkitdirectory</code> set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash.
(CVE-2021-38504)

- Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios.
Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Thunderbird before version 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. This bug only affects Thunderbird for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected. (CVE-2021-38505)

- Through a series of web navigations, Thunderbird could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
(CVE-2021-38506)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Mozilla Thunderbird version 91.3 or later.

Plugin Details

Severity: Critical

ID: 154875

File Name: mozilla_thunderbird_91_3.nasl

Version: 1.7

Type: local

Agent: windows

Family: Windows

Published: 11/3/2021

Updated: 11/18/2025

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-38503

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: installed_sw/Mozilla Thunderbird

Exploit Ease: No known exploits are available

Patch Publication Date: 11/3/2021

Vulnerability Publication Date: 11/2/2021

Reference Information

CVE: CVE-2021-38503, CVE-2021-38504, CVE-2021-38505, CVE-2021-38506, CVE-2021-38507, CVE-2021-38508, CVE-2021-38509, CVE-2021-38510, CVE-2021-43529, CVE-2021-43534, CVE-2021-43535

Detections

Analytics