CVE-2014-3676

Desbordamiento de buffer basado en la memoria dinámica en Shim permite a atacantes remotos ejecutar código arbitrario a través de una dirección IPv6 manipulada, relacionado con la opción de arranque 'tftp:// DHCPv6.'

A heap-based buffer overflow flaw was found the way shim parsed certain IPv6 addresses. If IPv6 network booting was enabled, a malicious server could supply a crafted IPv6 address that would cause shim to crash or, potentially, execute arbitrary code.

Shim is the initial UEFI bootloader that handles chaining to a trusted full bootloader under secure boot environments. A heap-based buffer overflow flaw was found the way shim parsed certain IPv6 addresses. If IPv6 network booting was enabled, a malicious server could supply a crafted IPv6 address that would cause shim to crash or, potentially, execute arbitrary code. An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys. A local attacker could potentially use this flaw to execute arbitrary code on the system.