🛡️ MGASA-2021-0551 — firefox

Updated firefox packages fix security vulnerability

Under certain circumstances, asynchronous functions could have caused a

navigation to fail but expose the target URL (CVE-2021-43536).

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an

attacker to corrupt memory leading to a potentially exploitable crash due to a

heap buffer overflow when using structured clone (CVE-2021-43537).

By misusing a race in our notification code, an attacker could have forcefully

hidden the notification for pages that had received both full screen and

pointer lock access, which could have been used for spoofing attacks

(CVE-2021-43538).

Failure to correctly record the location of live pointers across wasm instance

calls resulted in a GC occurring within the call not tracing those live

pointers. This could have led to a use-after-free causing a potentially

exploitable crash (CVE-2021-43539).

When invoking protocol handlers for external protocols, a supplied parameter

URL containing spaces was not properly escaped (CVE-2021-43541).

Using XMLHttpRequest, an attacker could have identified installed applications

by probing error messages for loading external protocols (CVE-2021-43542).

Documents loaded with the CSP sandbox directive could have escaped the

sandbox's script restriction by embedding additional content (CVE-2021-43543).

Using the Location API in a loop could have caused severe application hangs

and crashes (CVE-2021-43545).

It was possible to recreate previous cursor spoofing attacks against users

with a zoomed native cursor (CVE-2021-43546).

Mozilla developers and community members Julian Hector, Randell Jesup,

Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported

memory safety bugs present in Firefox ESR 91.3. Some of these bugs showed

evidence of memory corruption and we presume that with enough effort some of

these could have been exploited to run arbitrary code (CVE-2021-4129).