KLA12305 Multiple vulnerabilities in Mozilla Firefox ESR

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to execute arbitrary code, cause denial of service, obtain sensitive information, spoof user interface.

Below is a complete list of vulnerabilities:

1. A memory safety vulnerability can be exploited to execute arbitrary code.
2. An use after free vulnerability in MessageTask can be exploited to cause denial of service.
3. A data race vulnerability in crossbeam-deque can be exploited to obtain sensitive information.
4. A security UI vulnerability in message validation can be exploited to spoof user interface.
5. An use after free vulnerability in nsLanguageAtomService object can be exploited to cause denial of service.

Original advisories

MFSA2021-45

Related products

Mozilla-Firefox-ESR

CVE list

CVE-2021-38501 critical

CVE-2021-38496 critical

CVE-2021-38500 critical

CVE-2021-32810 critical

CVE-2021-38497 high

CVE-2021-38498 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.

• OSI

Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.

• DoS

Denial of service. Exploitation of vulnerabilities with this impact can lead to loss of system availability or critical functional fault.

• 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 91.2