Buffer overflow in Mozilla Firefox - CVE-2020-35114

Vulnerability identifier: #VU49025

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-35114

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mozilla Firefox
Arch Linux
Ubuntu
firefox (Alpine package)
firefox (Ubuntu package)

Install updates from vendor's website.

Mozilla Firefox - update to 84.0
firefox (Alpine package) - update to 84.0.1-r0
firefox (Ubuntu package) - addressed in versions 84.0+build3-0ubuntu0.16.04.1, 84.0+build3-0ubuntu0.18.04.1, 84.0+build3-0ubuntu0.20.04.1, 84.0+build3-0ubuntu0.20.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Arch Linux update for firefox
• Buffer overflow in firefox (Alpine package)
• Ubuntu update for firefox