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#7672 11/27/02 02:31 PM
Joined: Nov 2002
Posts: 1
Junior Member
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Junior Member
Joined: Nov 2002
Posts: 1
As part of a class project I need to write an exploit for the read below:

Code
unsigned char data[200];
int i,j,n;
 
n=open(filename, O_RDONLY);
 
i=-1;
do{
i++;
j=read(n,data+i,1);
}while(j>0);
I have the binary code for NOP/open a shell/etc, but I can't figure out how to store it correctly in data since I have to read from a file - It ends up stored as ascii characters, having different values from what I need.

Any help would be appreciated.

#7673 11/27/02 06:34 PM
Joined: May 2002
Posts: 189
Member
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Member
Joined: May 2002
Posts: 189
isnt this what they would call cheating...
(i couldnt help you anyway)

#7674 11/28/02 08:22 AM
Joined: Mar 2002
Posts: 1,273
DollarDNS Owner
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DollarDNS Owner
Joined: Mar 2002
Posts: 1,273
Are you trying to get a buffer overflow with that? seems you're reading characters from a file one at a time into the data buffer. If you read over 200 bytes, then possibly the data in the file after 200 bytes could be shell code and somehow get it executed. But anyway, that seems awefully vague.


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