KLA12336 Multiple vulnerabilities in Mozilla Firefox ESR

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

Below is a complete list of vulnerabilities:

1. Information disclosure vulnerability in Cloud Clipboard for Windows can be exploited to obtain sensitive information.
2. Security UI vulnerability can be exploited to spoof user interface or obtain sensitive information.
3. Security vulnerability in iframe sandbox rules can be exploited to bypass security restrictions.
4. Code execution vulnerability for MacOS can be exploited via special .inetloc files to execute arbitrary code.
5. Use after free vulnerability in file picker dialog can be exploited to cause denial of service.
6. Security vulnerability can be exploited to bypass security restrictions and spoof user interface.
7. Security bypass vulnerability in HTTP2 can be exploited to bypass security restrictions.
8. Security UI vulnerability in Javascript alert box can be exploited to spoof user interface.
9. Memory safety vulnerability can be exploited to execute arbitrary code.
10. Use after free vulnerability in HTTP2 Session object can be exploited to cause denial of service.

Original advisories

MFSA2021-49

Related products

Mozilla-Firefox-ESR

CVE list

CVE-2021-38505 high

CVE-2021-38506 warning

CVE-2021-38503 critical

CVE-2021-38510 critical

CVE-2021-38504 critical

CVE-2021-38508 warning

CVE-2021-38507 high

CVE-2021-38509 warning

CVE-2021-43535 critical

CVE-2021-43534 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.

• SB

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

• 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 91.3