Mageia: 2020-0377 Moderate: Firefox Memory Safety Exploits

Mozilla developer Jason Kratzer reported memory safety bugs present in Firefox ESR 78.2. 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-2020-15673).
Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in a XSS issue due to JavaScript being executed after pasting attacker-controlled data into a contenteditable element (CVE-2020-15676).
By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from (CVE-2020-15677).
When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompo...