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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Nice, share the knowledge and send the fail2ban rule ;) ill post
mine’s <o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>Jaswinder
Singh<br>
<b>Sent:</b> April-08-09 5:34 PM<br>
<b>To:</b> Asterisk Users Mailing List - Non-Commercial Discussion<br>
<b>Subject:</b> Re: [asterisk-users] Hacked<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Here's what fail2ban service
caught<br>
<br>
The IP 89.111.184.221 has just been banned by Fail2Ban after<br>
80 attempts against ASTERISK.<br>
<br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Apr 8, 2009 at 7:01 PM, Tilghman Lesher <<a
href="mailto:tilghman@mail.jeffandtilghman.com">tilghman@mail.jeffandtilghman.com</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>On Tuesday 07 April 2009
11:28:52 Tilghman Lesher wrote:<br>
> The recent vulnerability had nothing to do with this, but with the ability<br>
> of an attacker to scan a SIP server for legitimate usernames and
passwords.<br>
> This, by the way, merely took advantage of the SIP protocol, as written.<br>
> Normally, SIP allows you to differentiate between invalid usernames (404)<br>
> and invalid passwords (403). What we closed in the recent
vulnerability<br>
> patch was to allow administrators to send back 403, regardless of whether<br>
> the username existed or not.<o:p></o:p></p>
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<p class=MsoNormal>By the way, I am VASTLY oversimplifying the return codes
here for the sake of<br>
clarity. The actual return code is based upon a number of factors, but it
is<br>
modeled to return the same responses as would a bad password with a legitimate<br>
user account (thus making it impossible, externally, to tell the difference<br>
between a legitimate user account and a non-existent user account).<o:p></o:p></p>
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<p class=MsoNormal><br>
--<br>
Tilghman<br>
<br>
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