Another wargame - Competitions / Projects

chroniccommand

So I just whipped up another wargame in ASM. All the user has to do is open the wargame in gdb and examine the memory address of the variable "Password"

Here is the source of wargame.s:


# Wargame for iExploit
# Coded by Chroniccommand

&#46;data
	Password&#58;
		&#46;ascii \"welikeasm\"

	OneByte&#58;
		&#46;byte 15
	Message&#58;
		&#46;ascii \"This is not the password&#46;&#46;&#46;&#46;\"

&#46;text
	&#46;globl _start

	_start&#58;
		movl $1, %eax
		movl $0, %ebx
		int $0x80

To compile:


as -o wargame&#46;o wargame&#46;s

Then link it:


ld -o wargame wargame&#46;o

Solution:


&#91;chronic@vandal tmp&#93;$ gdb -q wargame
Reading symbols from /tmp/wargame&#46;&#46;&#46;(no debugging symbols found)&#46;&#46;&#46;done&#46;
(gdb) info variables
All defined variables&#58;

Non-debugging symbols&#58;
0x08049080  Password
0x08049089  OneByte
0x0804908a  Message
(gdb) x/12cb 0x08049080
0x8049080 &lt;Password&gt;&#58;   119 'w' 101 'e' 108 'l' 105 'i' 101 'e' 107 'k' 97 'a'  115 's'
0x8049088 &lt;Password+8&gt;&#58; 109 'm' 15 '\017'       84 'T'  104 'h'
(gdb) q

Sh3llc0d3

I was going to say this program just exits but thats obviously the point.

Edit: interesting choice in assembler syntax too, not many people follow my line and go for it, most use NASM.

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