CVE-2020-13753

El sandbox bubblewrap de WebKitGTK y WPE WebKit, versiones anteriores a 2.28.3, no pudo bloquear apropiadamente el acceso a CLONE_NEWUSER y al ioctl TIOCSTI. CLONE_NEWUSER podría ser usada potencialmente para confundir xdg-desktop-portal, que permite el acceso fuera del sandbox. TIOCSTI puede ser usado para ejecutar comandos directamente fuera del sandbox al escribir en el búfer de entrada del terminal de control, similar a CVE-2017-5226

A flaw was found in webkitgtk in versions prior to 2.28.3 and in WPE WebKit in versions prior to 2.28.3. The bubblewrap sandbox failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl. CLONE_NEWUSER could potentially be used to confuse xdg- desktop-portal, which allows access outside the sandbox. TIOCSTI can be used to directly execute commands outside the sandbox by writing to the controlling terminal’s input buffer, similar to CVE-2017-5226. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

An update that fixes 43 vulnerabilities is now available. This update for webkit2gtk3 fixes the following issues. Fixed logic issue allowing unexpectedly unenforced Content Security Policy when processing maliciously crafted web content. Fixed logic issue allowing universal cross site scripting when processing maliciously crafted web content.