Afternoon Ron,
Thanks for your tips and I applied it. The next tests are tomorrow night.
I'll send you the results.
Thanks lads for your help :o)
Thomas Nguyen Van (CEH) | OneIT Technical Security Consultant | OneIT
Operations | BT |
E: thomas.nguyenvan@bt.com |Mobile: +353 86 1720 692 | Fax: +353 1 432 5899|
www.btireland.com
-----Original Message-----
From: Ron Gula [mailto:rgula@tenablesecurity.com]
Sent: 15 January 2007 20:32
To: John Scherff
Cc: Thomas Nguyen Van; nessus@list.nessus.org
Subject: Re: SSH Credentials problem
Something I like to do when diagnosing why SSH credentials might not work
from UNIX to UNIX is to throw sshd into debug mode.
If you set LogLevel to DEBUG in sshd_config and then attempt a login, it
will log exactly why a login attempt failed. Don't forget to put it back to
INFO or to restart sshd when you make changes.
Ron Gula, CTO
Tenable Network Security
John Scherff wrote:
Thomas,
Does your Nessus scanner have a PTR record (reverse-map entry) in the
DNS? Some implementations of sshd have a bug wherein you can't turn
off reverse-map checking (setting 'ReverseMappingCheck' to 'no' in the
sshd_config file has no effect).
Also, are you doing anything with TCP wrappers on the target?
John Scherff
________________________________
From: nessus-bounces@list.nessus.org
[mailto:nessus-bounces@list.nessus.org] On Behalf Of Thomas Nguyen Van
Sent: Tuesday, December 19, 2006 8:26 AM
To: 'nessus@list.nessus.org'
Subject: RE: SSH Credentials problem
Good afternoon,
In addition to my previous mail of today, I would like to add those
information:
We did the following tests:
Test 1 - Manual SSH connection to IP_Nessus_Target with password: Ok
Test 2 - Manual SSH connection to IP_Nessus_Target with public/private
keys: Ok
Test 3 - Nessus SSH connection to IP_Nessus_Target with password: Ok
Test 4 - Nessus SSH connection to IP_Nessus_Target with public/private
keys: Failed
The analyse of the /var/adm/messages file on IP_Nessus_Target showed
that:
Dec 19 16:05:55 IP_Nessus_Target sshd[13422]: [ID 800047 auth.info] Did
not receive ident string from IP_Nessus_Scanner.
Dec 19 16:05:56 IP_Nessus_Target sshd[13423]: [ID 800047 auth.info]
Could not reverse map address IP_Nessus_Scanner. Dec 19 16:05:56
IP_Nessus_Target sshd[13423]: [ID 800047 auth.info] Connection closed
by IP_Nessus_Scanner Dec 19 16:06:01 IP_Nessus_Target sshd[13424]: [ID
800047 auth.info] Could not reverse map address IP_Nessus_Scanner.
Dec 19 16:06:01 IP_Nessus_Target sshd[13424]: [ID 800047 auth.info]
Connection closed by IP_Nessus_Scanner
Dec 19 16:06:01 IP_Nessus_Target sshd[13425]: [ID 800047 auth.info] Did
not receive ident string from IP_Nessus_Scanner.
Do you know why I read the message "Did not receive ident string from
IP_Nessus_Scanner." on the Nessus_Target?
Many thanks in advance
Regards,
Thomas
-----Original Message-----
From: Thomas Nguyen Van
Sent: 19 December 2006 13:04
To: 'nessus@list.nessus.org'
Subject: SSH Credentials problem
Good afternoon,
I checked your Nessus' FAQ before calling you
(http://mail.nessus.org/pipermail/nessus/2006-September/msg00186.html)
and I have quiet the same problem as JeanPaul.
Actually, I activated the plugins "Local Checks Failed" (21745) and
scanned a solaris server. On the /var/log/message file, I can see that
nessus account was able to connect on the target server:
Dec 19 13:01:09 Server_Target sshd[7724]: [ID 800047
auth.info] Accepted publickey for nessus_account from nessus_server
port 56364 ssh2
However, when I checked the .nbe file, I got the error message
associated to the plugin 21745 and I can't get any information like
security holes or general information with the plugin 12634.
I would really appreciate a clue to understand what happened.
Thanks a million
Thomas
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