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Date: Sat, 13 Jun 2009 11:22:35 +0300
From: "Antonios F. Atlasis" <atlasis@...ecom.ece.ntua.gr>
To: john-users@...ts.openwall.com
Subject: Re: cracking MD5 hashes more than 8 characters long
with a dictionary
Dear Alexander,
thanks a lot for your very quick response!
checking (counting) the precise length of these passwords, this is
exactly 16 characters. Hence, I suppose this is due to the limitation
that you mentioned concerning the MD5, right? A limitation that
obviously does not exist in Blowfish implementation, I guess.
Is there any work-around on this?
Thanks again
Antonios
Solar Designer wrote:
> On Sat, Jun 13, 2009 at 09:57:35AM +0300, Antonios F. Atlasis wrote:
>
>> I tried to use John 1.7.3-1 Pro against a shadow file with MD5 (FreeBSD)
>> hashes. This shadow contains some hashes that are longer than
>> 8-characters. I create a custom wordlist, that contains the actual
>> passwords included in this shadow. When I try to crack this shadow
>> using this custom wordlist, it cracks the passwords whose length is 8
>> characters or less, but not the ones whose length is more than 8
>> characters (although I feed the wordlist with the correct passwords)
>>
>
> That's weird. Those passwords should be getting cracked, assuming that
> they're not longer than 15 characters (a limitation of the current
> implementation of MD5-based crypt hashes in JtR).
>
> I suggest that you post a sample line from your shadow file and the
> corresponding plaintext password (the way you set it). Obviously, reset
> the password on the real account before you post this info.
>
>
>> Using exactly the same passwords and wordlist against a Blowfish shadow,
>> John successfully cracks all the passwords, even the ones whose length
>> is more than 8-characters.
>>
>
> Indeed, and this should be working for the MD5-based hashes too.
>
>
>> I tried to change maxlength of john.conf to 16, but this didn't hep me.
>>
>
> The MaxLen setting is for "incremental" mode only, not wordlist.
>
> Alexander
>
>
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