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#10304 06/10/04 06:49 PM
Joined: Jun 2004
Posts: 2
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Hi there,
here is a little quiz for you, i hope you can break it out, enjoy.

Here we go:

It was known, that at one server (bolero) runs a program exchanging secret messages. The client file in order to use this service can be seen here client.c

The client muss type the username and one-time-password, which sent unencrypted and can not be used for the next time.

Meanwhile, part of the Authenticationscomponents from the server is known, and unfortunately only three are arrive with SMS, namely:

Code
 #include <sys/socket.h> #include <netinet/in.h> #include <time.h> #define LISTENPORT 12012 #define MAXLINELEN 128 #define PASSLEN 32 void passwd_gen(char *pass) {int i; 
Code
  return; } int main(int argc, char **argv) {int s; int client; struct sockaddr_in addr; socklen_t addrlen;char *str,*str2; FILE *sock;char password[PASSLEN];char line[MAXLINELEN];
Code
 ;read(client,line,MAXLINELEN);if (strncmp (line,"USER QAEDA",10)) {fclose (sock);close (client);continue;}fflush (sock);fprintf(sock,"USER %s OK, SEND PASSWORD\n",line); 
The Mission:
The program in the server is vulnerable.
modify the client in order to get the secret message without any passwort

#10305 06/10/04 08:10 PM
Joined: Oct 2002
Posts: 955
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Don't post topics in multiple forums.

#10306 06/11/04 04:27 AM
Joined: Jan 2003
Posts: 217
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Oooo i love quizs, too bad i have no idea what to do. Could you some how do a goto and skip the password?


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