ASA-2019-00436 – Mozilla Firefox and Thunderbird: HTML parsing error can contribute to content XSS

Due to an error while parsing page content, it is possible for properly sanitized user input to be misinterpreted and lead to XSS hazards on web sites in certain circumstances.

ASA-2019-00435 – Mozilla Firefox and Thunderbird: Empty or malformed p256-ECDH public keys may trigger a segmentation fault

Empty or malformed p256-ECDH public keys may trigger a segmentation fault due values being improperly sanitized before being copied into memory and used.

ASA-2019-00432 – Mozilla Firefox and Thunderbird: Cross-origin POST requests can be made with NPAPI plugins by following 308 redirects

POST requests made by NPAPI plugins, such as Flash, that receive a status 308 redirect response can bypass CORS requirements. This can allow an attacker to perform Cross-Site Request Forgery (CSRF) attacks.

ASA-2019-00431 – Mozilla Firefox and Thunderbird: Script injection within domain through inner window reuse

When an inner window is reused, it does not consider the use of document.domain for cross-origin protections. If pages on different subdomains ever cooperatively use document.domain, then either page can abuse this to inject script into arbitrary pages on the other subdomain, even those that did not use document.domain to relax their origin security.

ASA-2019-00430 – Mozilla Firefox and Thunderbird: Sandbox escape via installation of malicious language pack

As part of his winning Pwn2Own entry, Niklas Baumstark demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation.