Secure FTP Applet Does Not Verify SSH Server Host Keys
SecurityTracker Alert ID: 1020346|
SecurityTracker URL: http://securitytracker.com/id/1020346
(Links to External Site)
Updated: Nov 19 2008|
Original Entry Date: Jun 23 2008
Disclosure of system information, Disclosure of user information, User access via network|
Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes |
Version(s): prior to 4.9.0|
A vulnerability was reported in Secure FTP Applet. A remote user can conduct man-in-the-middle attacks.|
The software does not verify the host key when the target user connects to the target server. A remote user can conduct a man-in-the-middle attack to monitor the connection between the target user and target server.
The vendor was notified on April 12, 2006.
Frank Dick and Thierry Zoller of n.runs AG reported this vulnerability.
A remote user can conduct man-in-the-middle attacks to monitor the connection.|
The vendor has issued a fixed version (4.9.0).|
Vendor URL: www.jscape.com/sftpapplet/index.html (Links to External Site)
|Underlying OS: Linux (Any), UNIX (Any), Windows (Any)|
Source Message Contents
Subject: [Full-disclosure] n.runs-SA-2008.001 - Jscape Secure FTP Applet|
Vendor: Jscape, http://www.jscape.com/
Affected Products: Jscape Secure FTP Applet
Vulnerability: SSH Host key is not verified allowing for Man in the
JSCAPE software has been deployed in a wide array of industries including
aerospace, banking, communications, education, insurance, finance,
government and software. With customers in more than 50 countries worldwide
the following is a small sample of companies who use JSCAPE products and
services. Customers include Boeing, SUN, ISS, SAP - See
http://www.jscape.com/clients.html for more details.
Secure FTP Applet is a secure FTP client component that runs within your web
browser. Secure FTP Applet [..] while encrypting all data exchanged between
the client and server using either the SFTP (FTP over SSH) or FTPS (FTP over
SSL) protocols [..] ensuring that all data exchanged is completely secure.
During the connection the Applet does not verify or display the host key. As
such n.runs was able to perform a man in the middle attack during a
penetration test at a client.
Read more about SSH Host verification:
The supposedly secure connection is no longer secure. n.runs was able to
extract login, password and data with a simple SSH Man in the Middle attack.
Upgrade to version 4.9.0 or above
2006/04/12 n.runs sends a Vulnerability notice informing Jscape about
nature of the problem and the impact.
2006/04/13 Jscape acknowledges and ask for more details
2006/04/13 n.runs sends more details
2007/07/26 n.runs asks for feedback and if the problem has been patched
2007/07/26 Jscape replies "We do not have a release date yet for this
2007/07/26 n.runs asks whether they can offer a estimate when the patch
will be available
2007/07/26 Jscape answers again "We do not have a release date yet for
2008/02/19 n.runs requests a statement to be used in the advisory as
seems to be no intention to patch and argues "you deem this
problem as low yet it renders the *secure connection*
2008/02/20 Jscape promises to "continue to look into this issue and
you when a patch is available.
2008/02/25 n.runs notifies Jscape that an advisory will be released by
end of the week if they do not patch the flaw n.runs reported
roughly 2 years ago.
"Given the long time this has already been reported
and the criticality of this issue, I would expect a patch to
ready by the end of the week. If the patch is not available
the end of this week (29.02.2008) I'll proceed with the
2008/02/29 Jscape notifies n.runs that the flaw has been patched
2008/06/01 n.runs verifies the patch and confirms that Man in the Middle
not longer possible if the user does not accept the new key.
n.runs however recommends that Jscape warns the users of the
security implications of a new SSH Host key rather then
displaying "New Host key".
Vulnerability discovered by Frank Dick and Thierry Zoller of n.runs AG.
n.runs AG is a vendor-independent consulting company specialising in the
areas of: IT Infrastructure, IT Security and IT Business Consulting. In
2007, n.runs expanded its core business area, which until then had been
project based consulting, to include the development of high-end security
Application Protection System - Anti Virus (aps-AV) is the first high-end
security solution that n.runs is bringing to the market.
Advisories can be found at : http://www.nruns.com/security_advisory.php
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indirect, incidental, consequential, loss of business profits or special
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