CVE-2020-12420

Al intentar conectarse a un servidor STUN, una condición de carrera podría haber causado un uso de la memoria previamente liberada de un puntero, conllevando a una corrupción de la memoria y un bloqueo potencialmente explotable. Esta vulnerabilidad afecta a Firefox ESR versiones anteriores a 68.10, Firefox versiones anteriores a 78 y Thunderbird versiones anteriores a 68.10.0

The Mozilla Foundation Security Advisory describes this flaw as: When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash.

An update that fixes 13 vulnerabilities is now available. This update for MozillaFirefox to version 78.0.1 ESR fixes the following issues. AppCache manifest poisoning due to url encoded character processing. Use-after-free in WebRTC VideoBroadcaster. Memory corruption due to missing sign-extension for ValueTags on ARM64. Information disclosure due to manipulated URL object. Use-after-free in nsGlobalWindowInner. Use-After-Free when trying to connect to a STUN server. RSA Key Generation vulnerable to side-channel attack. Add-On updates did not respect the same certificate trust rules as software updates. Integer overflow in nsJPEGEncoder::emptyOutputBuffer. DLL Hijacking due to searching %PATH% for a library. WebRTC permission prompt could have been bypassed by a compromised content process. Out of bound read in Date.parse. Memory safety bugs fixed in Firefox 78. This update was imported from the SUSE:SLE-15:Update update project.