Detections
Analytics

Mozilla Firefox < 91.0.1

high Nessus Plugin ID 152636

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Synopsis

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

Description

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 91.0.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2021-37 advisory.

 - Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. (CVE-2021-29991)

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

Solution

Upgrade to Mozilla Firefox version 91.0.1 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2021-37/

Plugin Details

Severity: High

ID: 152636

File Name: macos_firefox_91_0_1.nasl

Version: 1.5

Type: local

Agent: macosx

Published: 8/17/2021

Updated: 11/5/2021

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2021-29991

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: MacOSX/Firefox/Installed

Exploit Ease: No known exploits are available

Patch Publication Date: 8/16/2021

Vulnerability Publication Date: 8/16/2021

Reference Information

CVE: CVE-2021-29991

IAVA: 2021-A-0386-S