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Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution.

Use-after-free in HTTP2 Session object may cause exploitable crashes (MOZ-2021-0008).

Memory safety bugs in Firefox 93 and Firefox ESR 91.2 could result in arbitrary code execution (MOZ-2021-0007).

URL Parsing may incorrectly parse internationalized domains (MOZ-2021-0006).

'Copy Image Link' context menu action could have been abused to see authentication tokens (MOZ-2021-0005).

Download Protections were bypassed by.

Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509).

Web Extensions could access pre-redirect URL when their context menu was triggered by a user (MOZ-2021-0004).

Permission Prompt could be overlaid, resulting in user confusion and potential spoofing (CVE-2021-38508).

Improper sanitization when processing a QR code resulted in Universal XSS (MOZ-2021-0003).

Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports (CVE-2021-38507).

Firefox could be coaxed into going into fullscreen mode without notification or warning (CVE-2021-38506).

Windows 10 Cloud Clipboard may have recorded sensitive user data (CVE-2021-38505).

Use-after-free in file picker dialog (CVE-2021-38504).

Iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503).

Details of these vulnerabilities are as follows: Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), the most severe of which could allow for arbitrary code execution.

Large and medium business entities: HIGH.

Large and medium government entities: HIGH.

There are currently no reports of these vulnerabilities being exploited in the wild.

Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights. Depending on the privileges associated with the user an attacker could then install programs view, change, or delete data or create new accounts with full user rights. Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.

Mozilla Firefox is a web browser used to access the Internet. Multiple Vulnerabilities in Mozilla Firefox Could Allow for Arbitrary Code Execution MS-ISAC ADVISORY NUMBER: 2021-142 DATE(S) ISSUED: OVERVIEW: