Crackmes: cyrex’s Linux CrackMe
Find the correct password to get the good boy message 
it would be great for an solution how you solve this , and with what i solve this
with the standard GNU Debugger (gdb)
Difficulty: 1 - Very easy, for newbies
Platform: Unix/Linux, etc.
Language: C/C++
[Solving the Crackme]
Solving crackmes is fun but if you screwed up, it sucks big time. Thank goodness, heavy tasks are over. Anyway, let us see what we can do with this.
joset@kee:~/src/crackmes/crackme_01$ ./crackme -[ Linux CrackMe (Level:2) by cyrex ]- -[ TODO: You have to get the valid Password ]- Enter Password: 0x7d7 -[ Ohhhh, your skills are bad try again later ]- joset@kee:~/src/crackmes/crackme_01$
Do we have to use the debugger first? How about this?
joset@kee:~/src/crackmes/crackme_01$ strings crackme /lib/ld-linux.so.2 libc.so.6 printf __deregister_frame_info strcmp scanf _IO_stdin_used __libc_start_main __register_frame_info __gmon_start__ GLIBC_2.0 PTRhP QVhP [^_] -[ Linux CrackMe (Level:2) by cyrex ]- -[ TODO: You have to get the valid Password ]- Enter Password: 47ghf6fh37fbgbgj -[ Good, You’re ready to begin linux reversing ]- -[ Ohhhh, your skills are bad try again later ]- joset@kee:~/src/crackmes/crackme_01$
Do you see what I see? What if we will try using that as the password?
joset@kee:~/src/crackmes/crackme_01$ ./crackme -[ Linux CrackMe (Level:2) by cyrex ]- -[ TODO: You have to get the valid Password ]- Enter Password: 47ghf6fh37fbgbgj -[ Good, You're ready to begin linux reversing ]- joset@kee:~/src/crackmes/crackme_01$
There’s no protection at all just use the strings command. Trivial.
=)
Comment by niel — October 28, 2006 @ 5:52 am
“do you see what i see” ?? isn’t that a line from a christmas song? anyway, grats on the solve. continue learning man.
Comment by south coast marine — October 28, 2006 @ 5:55 am
I am announcing to the public that niel = south coast marine. wahahaha! and you’re right! that line is from a christmas song. we’ll be hearing that line over and over soon.
Comment by Joset Anthony Zamora — October 29, 2006 @ 1:31 am
hahaha you’ve got my identity mixed up there.. i’m not niel. i don’t know the guy even.
Comment by south coast marine — October 29, 2006 @ 3:51 am