ImageMagick: stack-based buffer overflow at coders/pnm.c in WritePNMImage because of a misplaced assignment

A stack-based buffer overflow was discovered in ImageMagick in the way it writes PNM images due to a misplaced assignment. Applications compiled against ImageMagick libraries that accept untrustworthy images or write PNM images may be vulnerable to this flaw. An attacker could abuse this flaw by...