Detections
Analytics

Mozilla Thunderbird < 78.6

high Nessus Plugin ID 144284

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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 78.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-56 advisory.

 - Mozilla developer Christian Holler reported memory safety bugs present in Thunderbird 78.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. (CVE-2020-35113)

 - When a BigInt was right-shifted the backing store was not properly cleared, allowing uninitialized memory to be read. (CVE-2020-16042)

 - Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers. (CVE-2020-26971)

 - Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. (CVE-2020-26973)

 - When <code>flex-basis</code> was used on a table wrapper, a <code>StyleGenericFlexBasis</code> object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. (CVE-2020-26974)

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 78.6 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/

Plugin Details

Severity: High

ID: 144284

File Name: mozilla_thunderbird_78_6.nasl

Version: 1.5

Type: local

Agent: windows

Family: Windows

Published: 12/15/2020

Updated: 11/18/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2020-35113

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/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: 12/15/2020

Vulnerability Publication Date: 12/2/2020

Reference Information

CVE: CVE-2020-16042, CVE-2020-26971, CVE-2020-26973, CVE-2020-26974, CVE-2020-26978, CVE-2020-35111, CVE-2020-35112, CVE-2020-35113

MFSA: 2020-56