Debian DSA-4788-1 : firefox-esr - security update

high Nessus Plugin ID 142858

Synopsis

The remote Debian host is missing a security-related update.

Description

A use-after-free was found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code.

Solution

Upgrade the firefox-esr packages.

For the stable distribution (buster), this problem has been fixed in version 78.4.1esr-1~deb10u1.

See Also

https://security-tracker.debian.org/tracker/source-package/firefox-esr

https://packages.debian.org/source/buster/firefox-esr

https://www.debian.org/security/2020/dsa-4788

Plugin Details

Severity: High

ID: 142858

File Name: debian_DSA-4788.nasl

Version: 1.6

Type: local

Agent: unix

Published: 11/12/2020

Updated: 3/2/2022

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 7.7

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:F/RL:OF/RC:C

CVSS Score Source: CVE-2020-26950

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.2

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

Temporal Vector: E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:firefox-esr, cpe:/o:debian:debian_linux:10.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/10/2020

Vulnerability Publication Date: 12/9/2020

Exploitable With

Metasploit (Firefox MCallGetProperty Write Side Effects Use After Free Exploit)

Reference Information

CVE: CVE-2020-26950

DSA: 4788

IAVA: 2020-A-0531-S