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Old 11-01-2001, 02:16 PM   #1
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Registered: Oct 2001
Posts: 5

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Unhappy a student

I know nothing about this exercise in a course about security...have been trying to understand this problem for last 3 hours...still in vain...can someone give me a hint??

#include <iostream>

char command[40]; // Send command to
int time_of_day; // Avoid replay attack?
const bool ever = 1;

for ( ;ever; )
cin >> time_of_day >> command;
cout << "Command was " << command << " at time " << time_of_day << endl;

if we try input:
13 report
13 shoot-to-kill
15 shoot only if they shoot first
12:00 fire

how can someone perform a denial of service attack on this server? This same error was present in NT4, prior to service pack 2. This problem is difficult to fix with the C++ stream library, but easy to fix with C's I/O library:
#include <stdio.h>

#define ever 1


{ char command[40]; // Send command to
int time_of_day; // Avoid replay attack?

for ( ;ever; )
scanf("%d %[^\n]",&time_of_day,command);
printf("Command %s at time %d\n",command,time_of_day);

The regular expression matcher %[^\n] means `match any object consisting of any character up to end of line'.
Why is it safer now?
Old 11-01-2001, 05:51 PM   #2
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Registered: Jun 2001
Posts: 1,635

Rep: Reputation: 45
this thread is also in the programming forum.
please post anything further on that thread. we forgive you this time, but in the future, please don't double post

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