dillo: PNG-related integer overflow

Integer overflow in the Png_datainfo_callback function in Dillo 2.1 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a PNG image with crafted (1) width or (2) height values.

Format string vulnerability in the a_Interface_msg function in Dillo before 0.8.3-r4 allows remote attackers to execute arbitrary code via format string specifiers in a web page.