Detections
Analytics

Mozilla Firefox ESR < 115.6

high Nessus Plugin ID 187078

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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 ESR installed on the remote macOS or Mac OS X host is prior to 115.6. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2023-54 advisory.

 - Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. 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-2023-6864)

 - The WebGL <code>DrawElementsInstanced</code> method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. (CVE-2023-6856)

 - <code>EncryptingOutputStream</code> was susceptible to exposing uninitialized data. This issue could only be abused in order to write data to a local disk which may have implications for private browsing mode.
 (CVE-2023-6865)

 - When resolving a symlink, a race may occur where the buffer passed to <code>readlink</code> may actually be smaller than necessary. This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected. (CVE-2023-6857)

 - Firefox was susceptible to a heap buffer overflow in <code>nsTextFragment</code> due to insufficient OOM handling. (CVE-2023-6858)

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 ESR version 115.6 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/

Plugin Details

Severity: High

ID: 187078

File Name: macos_firefox_115_6_esr.nasl

Version: 1.5

Type: local

Agent: macosx

Published: 12/19/2023

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: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2023-6864

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:firefox_esr

Required KB Items: installed_sw/Mozilla Firefox ESR

Exploit Ease: No known exploits are available

Patch Publication Date: 12/19/2023

Vulnerability Publication Date: 12/19/2023

Reference Information

CVE: CVE-2023-6856, CVE-2023-6857, CVE-2023-6858, CVE-2023-6859, CVE-2023-6860, CVE-2023-6861, CVE-2023-6862, CVE-2023-6863, CVE-2023-6864, CVE-2023-6865, CVE-2023-6867

IAVA: 2023-A-0702-S