Detections
Analytics

Mozilla Firefox < 84.0

critical Nessus Plugin ID 144283

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Synopsis

A web browser installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.

Description

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 84.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-54 advisory.

 - The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash. (CVE-2020-26972)

 - 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 Firefox version 84.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/

Plugin Details

Severity: Critical

ID: 144283

File Name: macos_firefox_84_0.nasl

Version: 1.10

Type: local

Agent: macosx

Published: 12/15/2020

Updated: 11/18/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2020-26972

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: installed_sw/Mozilla Firefox

Exploit Available: true

Exploit Ease: 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-2020-26972, CVE-2020-26973, CVE-2020-26974, CVE-2020-26975, CVE-2020-26976, CVE-2020-26977, CVE-2020-26978, CVE-2020-26979, CVE-2020-35111, CVE-2020-35112, CVE-2020-35113, CVE-2020-35114

IAVA: 2020-A-0575-S, 2021-A-0051-S

MFSA: 2020-54