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Date: Fri, 16 Nov 2012 21:52:00 +0100
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: cracking passwords with a kerberos traffic dump

On 16 Nov, 2012, at 17:03 , Dhiru Kholia <dhiru.kholia@...il.com> wrote:
> On Fri, Nov 16, 2012 at 4:27 AM, buawig <buawig@...il.com> wrote:
>> I loaded the pcap file into cain but nothing showed up in the MS
>> Kerberos5 PreAuth section.
>> Yes, I inspected the pcap file with wireshark and in the AS-REP packet I
>> see the enc-part rc4-hmac but the actual value is a lot longer than the
>> sample in mskrb5_fmt_plug.c:24
>> and I wouldn't know where I can find the 'checksum' value.
> 
> What is the value of "Encryption type" when you view the AS-REQ packet
> in Wireshark?
> 
> On my setup (which is using default values) it is 18
> (aes256-cts-hmac-sha1-96 is being used).
> 
> We might need to implement http://www.packetizer.com/rfc/rfc3962/ in JtR.

That reminds me of our recent (currently only in git) krb5-18 format submitted by Camille Mougey. You need to uncomment HAVE_KRB5 in Makefile to build it (and you need libkrb5-dev installed).

We also have krb5-23 by the same author. That is arcfour-hmac. Tools are included too - see doc/README-krb5-18-23 for instructions.

Apparently both these would attack a dumped realm database though - not sniffed data.

fwiw,
magnum

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