CVE-2018-20189

En GraphicsMagick 1.3.31, la función ReadDIBImage de coders/dib.c tiene una vulnerabilidad que permite un cierre inesperado y una denegación de servicio (DoS) mediante un archivo dib que está manipulado para que aparezca con valores de píxel directos, así como mapeo por color (que no está disponible más allá de las muestras de 8 bits) y, por lo tanto, carece de indexación.

It was discovered that GraphicsMagick was not properly performing bounds checks when processing TGA image files, which could lead to a heap buffer overflow. If a user or automated system were tricked into processing a specially crafted TGA image file, an attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. It was discovered that GraphicsMagick was not properly validating bits per pixel data when processing DIB image files. If a user or automated system were tricked into processing a specially crafted DIB image file, an attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.