RHSA-2021:5014

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 94.

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.

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash.

Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols.

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

When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not properly escaped.

Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL.

Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by embedding additional content.

It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.

By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks.