The netpbm packages contain a library of functions which support programsfor handling various graphics file formats, including .pbm (Portable BitMap), .pgm (Portable Gray Map), .pnm (Portable Any Map), .ppm (PortablePixel Map), and others.Two heap-based buffer overflow flaws were found in the embedded JasPerlibrary, which is used to provide support for Part 1 of the JPEG 2000 imagecompression standard in the jpeg2ktopam and pamtojpeg2k tools. An attackercould create a malicious JPEG 2000 compressed image file that could causejpeg2ktopam to crash or, potentially, execute arbitrary code with theprivileges of the user running jpeg2ktopam. These flaws do not affectpamtojpeg2k. (CVE-2011-4516, CVE-2011-4517)A stack-based buffer overflow flaw was found in the way the xpmtoppm toolprocessed X PixMap (XPM) image files. An attacker could create a maliciousXPM file that would cause xpmtoppm to crash or, potentially, executearbitrary code with the privileges of the user running xpmtoppm.(CVE-2009-4274)Red Hat would like to thank Jonathan Foote of the CERT Coordination Centerfor reporting the CVE-2011-4516 and CVE-2011-4517 issues.All users of netpbm are advised to upgrade to these updated packages,which contain backported patches to correct these issues.