SB2021090711 - Multiple vulnerabilities in Mozilla Firefox

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2021-38495)

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 web page, 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.

2) Buffer overflow (CVE-ID: CVE-2021-38494)

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 web page, 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.

3) Buffer overflow (CVE-ID: CVE-2021-38493)

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 web page, 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.

4) Input validation error (CVE-ID: CVE-2021-38492)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input when delegating navigations to the operating system. Firefox accept the mk scheme, which allows a remote attacker to launch pages and execute scripts in Internet Explorer in unprivileged mode.

5) Security restrictions bypass (CVE-ID: CVE-2021-38491)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to Mixed-Content-Blocking was unable to check opaque origins. As a result, the mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded.

6) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-29993)

The vulnerability allows a remote attacker to perform denial of service or spoofing attack.

The vulnerability exists due to Firefox allows navigation through the intent:// protocol. A remote attacker can trick the victim to follow a specially crafted link and perform a denial of service attack or spoof the UI.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-40/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-39/