CVE-2022-2601

Se encontró un desbordamiento del búfer en grub_font_construct_glyph(). Una fuente pf2 manipulada maliciosamente puede provocar un desbordamiento al calcular el valor max_glyph_size, asignando un búfer más pequeño de lo necesario para el glifo, lo que además provoca un desbordamiento del búfer y una escritura fuera de los límites basada en el heap. Un atacante puede utilizar esta vulnerabilidad para eludir el mecanismo de arranque seguro.

A flaw was found where a maliciously crafted pf2 font could lead to an out-of-bounds write in grub2. A successful attack can lead to memory corruption and secure boot circumvention.

Juraj Somorovsky, Marcel Maehren, Nurullah Erinola, and Robert Merget discovered that the DTLS implementation in the JSSE subsystem of OpenJDK did not properly restrict handshake initiation requests from clients. A remote attacker could possibly use this to cause a denial of service. Markus Loewe discovered that the Java Sound subsystem in OpenJDK did not properly validate the origin of a Soundbank. An attacker could use this to specially craft an untrusted Java application or applet that could load a Soundbank from an attacker controlled remote URL.