SB2021120711 - Multiple vulnerabilities in Mozilla Firefox
Published: December 7, 2021 Updated: February 22, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 13 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2021-4128)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when transitioning in and out of fullscreen mode. A remote attacker can trick the victim to visit a specially crafted website, trigger a use-after-free error and execute arbitrary code on the system.
Note, the vulnerability affects Firefox installations on macOS only.
2) Information disclosure (CVE-ID: CVE-2021-43536)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to URL leakage when executing asynchronous functions. A remote attacker can trick the victim to open a specially crafted web page and reveal the URL of the page that is being visited afterwards.
3) Type conversion (CVE-ID: CVE-2021-43537)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a type conversion error when processing sizes from 64bit to 32bit integers when using structured clone. A remote attacker can trick the victim to visit a specially crafted web page, trigger a heap-based buffer overflow and execute arbitrary code on the system.
4) Spoofing attack (CVE-ID: CVE-2021-43538)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to a race in notification code. A remote attacker can hide the notification for pages that had received full screen and pointer lock access. Successful exploitation of the vulnerability may allow an attacker to perform spoofing attack.
5) Use-after-free (CVE-ID: CVE-2021-43539)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in GC rooting when calling wasm instance methods. A remote attacker can trick the victim to open a specially crafted web page, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
6) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-43540)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to an error with WebExtensions that causes a WebExtension with the correct permissions to create and install ServiceWorkers for third-party websites that cannot be uninstalled with the extension.
7) Input validation error (CVE-ID: CVE-2021-43541)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input when handling spaces in URLS with external protocol handlers. A remote attacker can trick the victim to click on a specially crafted link and pass unescaped input to a third-party application via URI handler.
8) Information disclosure (CVE-ID: CVE-2021-43542)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way Firefox handles XMLHttpRequest requests. A remote attacker can initiate a XMLHttpRequest and identify installed applications by probing error messages for loading external protocols.
9) Security features bypass (CVE-ID: CVE-2021-43543)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to an error when handling CSP policies. Documents loaded with the CSP sandbox directive can escape the sandbox's script restriction by embedding additional content.
10) Input validation error (CVE-ID: CVE-2021-43544)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to insufficient validation of user-supplied input, when receiving a URL through a SEND intent. A remote attacker can trick the application to search for the specially crafted text, however subsequent usages of the address bar might caused the URL to load unintentionally, leading to XSS or spoofing attacks.
11) Infinite loop (CVE-ID: CVE-2021-43545)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop when using Location API. A remote attacker can consume all available system resources and cause denial of service conditions.
12) Spoofing attack (CVE-ID: CVE-2021-43546)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data, when native cursor is zoomed. A remote attacker can perform cursor spoofing attack.
13) Buffer overflow (CVE-ID: CVE-2021-4129)
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.
Remediation
Install update from vendor's website.