KLA11945 Multiple vulnerabilities in Mozilla Firefox ESR

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to execute arbitrary code, spoof user interface, bypass security restrictions, gain privileges.

Below is a complete list of vulnerabilities:

1. Security UI vulnerability in eval() function can be exploited to spoof user interface and execute arbitrary code.
2. Memory safety vulnerabilities can be exploited to execute arbitrary code.
3. Elevation of privilege vulnerability on Windows can be exploited to bypass security restrictions, gain privileges and execute arbitrary code.

Original advisories

MFSA2020-38

Related products

Mozilla-Firefox-ESR

CVE list

CVE-2020-15663 critical

CVE-2020-15664 high

CVE-2020-15670 critical

Solution

Update to the latest version

Download Firefox ESR

Impacts

• ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

• SB

Security bypass. Exploitation of vulnerabilities with this impact can lead to performing actions restricted by current security settings.

• PE

Privilege escalation. Exploitation of vulnerabilities with this impact can lead to performing by abuser actions, which are normally disallowed for current role.

• SUI

Spoof user interface. Exploitation of vulnerabilities with this impact can lead to changes in user interface to beguile user into inaccurate behavior.

Affected Products

• Mozilla Firefox ESR earlier than 78.2