cauchy_htb's KeygenMe #1
| Download cauchy_keygenme1.zip, 9 kb (password: crackmes.de) Browse contents of cauchy_keygenme1.zip A little crypto + need to patch ONE byte, should be no problem, but definetly not for newbies ;]
Difficulty: 3 - Getting harder | Send a message to cauchy_htb » View profile of cauchy_htb » |
Solutions
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Discussion and comments
| Bauer Bimpf 09. Aug 2005 | This keygenme is faulty and should be removed or fixed by the author. At 401353, ESI is pointing at the user name. There will be garbage after that string on all executions after the first execution, because the buffer is not zero_init'ed. That garbage affects calculation for all names that do not end on a dword boundary, ie. (namelength MOD 4 != 0). Guys, get your keygenmes right! Such errors can piss people off, good that I noticed it early on! |
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