Detections
Analytics

Mozilla Firefox < 82.0

critical Nessus Plugin ID 141572

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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 82.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-45 advisory.

 - Mozilla developers Christian Holler, Sebastian Hengst, Bogdan Tara, and Tyson Smith reported memory safety bugs present in Firefox 81. 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-2020-15684)

 - A use-after-free bug in the usersctp library was reported upstream. We assume this could have led to memory corruption and a potentially exploitable crash. (CVE-2020-15969)

 - In the crossbeam rust crate, the bounded channel incorrectly assumed that Vec::fromiter had allocated capacity that was the same as the number of iterator elements. Vec::fromiter does not actually guarantee that and may allocate extra memory. The destructor of the bounded channel reconstructs Vec from the raw pointer based on the incorrect assumptions - this is unsound and caused a deallocation with the incorrect capacity when Vec::fromiter had allocated different sizes than the number of iterator elements. The impact on Firefox is undetermined, but in another use case, the behavior was causing corruption of jemalloc structures. (CVE-2020-15254)

 - If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. (CVE-2020-15680)

 - When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. (CVE-2020-15681)

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 82.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/

Plugin Details

Severity: Critical

ID: 141572

File Name: macos_firefox_82_0.nasl

Version: 1.8

Type: local

Agent: macosx

Published: 10/20/2020

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-2020-15684

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: 10/20/2020

Vulnerability Publication Date: 10/16/2020

Reference Information

CVE: CVE-2020-15254, CVE-2020-15680, CVE-2020-15681, CVE-2020-15682, CVE-2020-15683, CVE-2020-15684, CVE-2020-15969

IAVA: 2020-A-0472-S

MFSA: 2020-45