CVE-2013-6954

La función png_do_expand_palette en libpng anteriores a 1.6.8 permite a atacantes remotos causar una denegación de servicio (referencia a puntero NULO y crash de la aplicación) a través de (1) un chunk PLTE de cero bytes o (2) una paleta NULL, relacionada con pngrtran.c y pngset.c

The png_do_expand_palette function in libpng before 1.6.8 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a PLTE chunk of zero bytes or a NULL palette, related to pngrtran.c and pngset.c. An integer overflow leading to a heap-based buffer overflow was found in the png_set_sPLT() and png_set_text_2() API functions of libpng. An attacker could create a specially-crafted image file and render it with an application written to explicitly call png_set_sPLT() or png_set_text_2() function, could cause libpng to crash or execute arbitrary code with the permissions of the user running such an application. An integer overflow leading to a heap-based buffer overflow was found in the png_set_unknown_chunks() API function of libpng. An attacker could create a specially-crafted image file and render it with an application written to explicitly call png_set_unknown_chunks() function, could cause libpng to crash or execute arbitrary code with the permissions of the user running such an application.