CVE-2021-46829

GdkPixbuf de GNOME (también se conoce como GDK-PixBuf) versiones anteriores a 2.42.8, permite un desbordamiento del búfer en la región heap de la memoria cuando son compuestos o borran fotogramas en archivos GIF, como es demostrado por el archivo io-gif-animation.c composite_frame. Este desbordamiento es controlable y podría ser abusado para la ejecución de código, especialmente en sistemas de 32 bits

A heap-based buffer overflow vulnerability was found in GNOME GdkPixbuf (aka GDK-PixBuf) when compositing or clearing frames in GIF files. The vulnerability exists due to a boundary error when processing GIF images. This flaw allows an attacker to create a specially crafted GIF image, trick the victim into opening it, triggering an out-of-bounds write, which allows executing arbitrary code on the target system or causing a potential crash.

Pedro Ribeiro discovered that the GDK-PixBuf library did not properly handle certain GIF images. If an user or automated system were tricked into opening a specially crafted GIF file, a remote attacker could use this flaw to cause GDK-PixBuf to crash, resulting in a denial of service, or possibly execute arbitrary code.