Mozilla Firefox < 85.0

high Nessus Plugin ID 145465

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Synopsis

A web browser installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Firefox installed on the remote Windows host is prior to 85.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-03 advisory.

- Mozilla developers Sebastian Hengst, Christian Holler, Tyson Smith reported memory safety bugs present in Firefox 84. 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-2021-23965)

- If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross- origin information, when said information is served as chunked data. (CVE-2021-23953)

- Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. (CVE-2021-23954)

- The browser could have been confused into transferring a pointer lock state into another tab, which could have lead to clickjacking attacks. (CVE-2021-23955)

- An ambiguous file picker design could have confused users who intended to select and upload a single file into uploading a whole directory. This was addressed by adding a new prompt. (CVE-2021-23956)

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 85.0 or later.

Plugin Details

Severity: High

ID: 145465

File Name: mozilla_firefox_85_0.nasl

Version: 1.11

Type: local

Agent: windows

Family: Windows

Published: 1/27/2021

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: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-23965

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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: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: 1/26/2021

Vulnerability Publication Date: 1/26/2021

Reference Information

CVE: CVE-2021-23953, CVE-2021-23954, CVE-2021-23955, CVE-2021-23956, CVE-2021-23957, CVE-2021-23958, CVE-2021-23959, CVE-2021-23960, CVE-2021-23961, CVE-2021-23962, CVE-2021-23963, CVE-2021-23964, CVE-2021-23965

IAVA: 2021-A-0051-S, 2021-A-0185-S

Detections

Analytics