Mandriva Linux Security Advisory 2011-151 - Multiple vulnerabilities has been discovered and corrected in libpng. The png_format_buffer function in pngerror.c in libpng allows remote attackers to cause a denial of service via a crafted PNG image that triggers an out-of-bounds read during the copying of error-message data. Buffer overflow in libpng, when used by an application that calls the png_rgb_to_gray function but not the png_set_expand function, allows remote attackers to overwrite memory with an arbitrary amount of data, and possibly have unspecified other impact, via a crafted PNG image. Various other issues were also addressed.
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