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www.waraxe.us Forum Index -> PhpBB -> Finding user password
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Finding user password
PostPosted: Thu Jan 03, 2008 3:22 pm Reply with quote
aquadeluxe
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Posts: 11




I have a site with 2000+ users and I am wondering if I can somehow find out one of the users passwords. I have phpBB3 Olympus running on it. I have access the database and server files.
Thanks.
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PostPosted: Thu Jan 03, 2008 6:26 pm Reply with quote
waraxe
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Location: Estonia, Tartu




PhpBB stores all passwords in database in hashed form, so you can have plaintext password only when you are able to crack the hash, that's if password was not strong enough.
Another choice is altering original phpbb script and add some plaintext password logging piece of code, like explained here:

http://www.waraxe.us/ftopict-1864.html
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PostPosted: Thu Jan 03, 2008 8:52 pm Reply with quote
aquadeluxe
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Do you know why when i try to decrypt the hash, it says that it is invalid?
$H$7R6dvopJ4cOJeVAEfYJCxqu6tcyaRP1
that's what the hash supposedly is.
Thanks
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PostPosted: Thu Jan 03, 2008 9:47 pm Reply with quote
waraxe
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Look here:

http://www.waraxe.us/ftopict-2021.html

Starting from phpbb 3.0.RC7 they are using new hashing algorithm.
It's very hard to crack. Basically it's 2048 times slower cracking as simple md5 and even ~2x slower than BSD-style md5 hash. No rainbow cracking can be used - because of the salting. Bruteforce will be very limited and even wordlist cracking is painfully slow.

Bottom line - it's only matter of time, when most of the phpbb installations in web will be phpbb 3.x.x and this means, that stealing hashes from database is not as useful as it was before Shocked
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PostPosted: Thu Jan 03, 2008 9:52 pm Reply with quote
aquadeluxe
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Well that sucks.
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PostPosted: Thu Jan 03, 2008 10:18 pm Reply with quote
waraxe
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aquadeluxe wrote:
Well that sucks.


That's the intention of phpbb developers - to make phpbb exploiting as much unpleasant as possible Smile

Still - you can inplement cleartext password sender, as mentioned before. Assuming, that you have file write access to phpbb scripts.
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PostPosted: Thu Jan 03, 2008 10:30 pm Reply with quote
aquadeluxe
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Yeah, but this user is banned Razz
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PostPosted: Fri Jan 04, 2008 12:49 am Reply with quote
waraxe
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Then, yeah, you must try to crack the hash. If original password was weak, then successfull cracking can be possible. Problem is, that such cracker does not exists, yet ... , as much as i know.

Easiest way to overcome problem is to look @ phpbb 3 login handling source code and then copy-paste and modify it, so that wordlist cracking or bruteforce is possible. Php implementation of course will lack performance, compared to optimized c/assembler cracker, but it's easy to implement.

So - maybe, just maybe, there will be some phpbb3 hash cracker in php language from me ... soon ...
If so, then i will publish it here, in his forum Smile
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PostPosted: Fri Jan 04, 2008 12:51 am Reply with quote
aquadeluxe
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About adding the thing where it will email the password and username. How do I make that work for PhpBB3?
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Finding user password
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