RLSA-2021:5013

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

This update upgrades Firefox to version 91.4.0 ESR.

Security Fix(es):

• Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4

• Mozilla: URL leakage when navigating while executing asynchronous function (CVE-2021-43536)

• Mozilla: Heap buffer overflow when using structured clone (CVE-2021-43537)

• Mozilla: Missing fullscreen and pointer lock notification when requesting both (CVE-2021-43538)

• Mozilla: GC rooting failure when calling wasm instance methods (CVE-2021-43539)

• Mozilla: External protocol handler parameters were unescaped (CVE-2021-43541)

• Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler (CVE-2021-43542)

• Mozilla: Bypass of CSP sandbox directive when embedding (CVE-2021-43543)

• Mozilla: Denial of Service when using the Location API in a loop (CVE-2021-43545)

• Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed (CVE-2021-43546)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.