bugtraq - Re: AIX password enumeration possible

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Date: Thu, 12 Feb 2004 11:01:10 +0100
From: Sven Specker <specker@...uni-frankfurt.de>
To: Scott J <mrbinary@...oo.com>
Cc: specker@...uni-frankfurt.de, bugtraq@...urityfocus.com
Subject: Re: AIX password enumeration possible

Tested with AIX 5.1 ML05, Commercial SSH v3.2.2

Known account on yyyy set to rlogin=false, ssh allows only 1 connection attempt before error.

Case 1: Incorrect Password given.

user@...x:> ssh yyyy
user's password: 
warning: Authentication failed.
Disconnected; no more authentication methods available (No further authentication methods available.).

Case 2: Correct Password given.

user@...x:> ssh yyyy
user's password: 
warning: Authentication failed.
Disconnected; no more authentication methods available (No further authentication methods available.).

It seems as if the commercial ssh behaves differently and uses it's own messages. All r-services and telnet are no longer existant on our systems, so it appears to me that the easiest solution would be to use the commercial ssh and dump the r-services. That's seems the best way for ppl who are eligible to use the source release of the commercial ssh. 

Regards,

Sven Specker

-- 
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*** Sven Specker -- University of Frankfurt Computing Center   ***
************ UNIX System Administration (NIM/Security) ***********
***** specker@...uni-frankfurt.de [Phone (+49)-69-798-25188] *****
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