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Re: WebEx Downloader Plug-in Multiple Vulnerabilities + rant
From: Mark Rowe <mark.rowe () pentest co uk>
Date: Fri, 14 Jul 2006 15:51:34 +0100

Hi all,

I've spoken with Mark Litchfield this week and I just want to clarify
that in no way did Skype divulge any information imparted to them to
Pentest Limited or to our knowledge any one else regarding Mark's
discoveries. It was purely coincidence that one of the vulnerabilities
we reported to Skype was the same as discovered by Mark.

I did ask Mark to post to this list to clear this up but I guess he is
too busy.

I like conspiracy theories as much as the next person but this
definitely isn't an X-file :)


Mark Litchfield wrote:

All these vulnerabilities were reported to WebEx by NGS Software back on
the 24th February 2005 along with some other issues.

The current Director of the X-Force new about these issues as at the
time of their discovery, he worked with NGS.

Seeing as I'm the subject, here is another example whereby I found a bug
(in Skype) except Pentest-Limited were credited with it's discovery -
http://www.theregister.co.uk/2005/10/25/skype_vuln/  An extract from an
email below from Kurt Sauer (Security Operations / Skype Technologies),
shows that Mark Rowe of Pentest Ltd for some unknown reason had access
to my email sent to Kurt.

In reviewing our mail archives, I see that you *DID* report the vuln (the
VCARD aspect) to us -- to ME, directly -- before Mark Rowe did.  However, I
(gulp) mishandled the e-mail.

As you surmised, it appears that Mark Rowe read that mail and found another
instantiation of the same bug, namely the handling of the command-line

Completely my fault on that.  It will take one "push" cycle (typically less
than a day) to get a correction posted, but I will both correct our
announcement and also redistribute it with corrected attribution.

I should have asked you to CC security () skype net on the actual vuln report,
because mail sent to that address is read by more than just me.

Importantly, I am going to hire a dedicated incident manager (as fast as
our hiring practices will allow) so that there is someone spending full
workdays just handing inbound messages on this topic.

Could never be bothered before to make an issue of it.  But to sit on a
large number of flaws in a vendors software product for 498 days and see
other companies credited is a tad annoying :)

All the best

Mark Litchfield

----- Original Message ----- From: "David Litchfield" <>
To: "Mark Litchfield" <mark () ngssoftware com>
Sent: Friday, July 07, 2006 4:12 PM
Subject: Fw: [SA20956] WebEx Downloader Plug-in Multiple Vulnerabilities

You're not credited - are any of these yours?

----- Original Message ----- From: "Secunia Security Advisories"
<sec-adv () secunia com>
To: <>
Sent: Friday, July 07, 2006 12:32 PM
Subject: [SA20956] WebEx Downloader Plug-in Multiple Vulnerabilities


Reverse Engineer Wanted

Secunia offers a Security Specialist position with emphasis on
reverse engineering of software and exploit code, auditing of
source code, and analysis of vulnerability reports.



WebEx Downloader Plug-in Multiple Vulnerabilities



Highly critical

System access

From remote

WebEx Downloader plug-in 2.x

Some vulnerabilities have been reported in WebEx Downloader plug-in,
which can be exploited by malicious people to compromise a user's

1) An error exists in the ActiveX and Java versions of the WebEx
Downloader plug-in where the source of downloaded components is not
properly verified. This can be exploited to install malicious
components on a user's system.

Successful exploitation allows execution of arbitrary code, but
requires that the user e.g. is tricked into visiting a malicious web

The vulnerability has been reported in version Other
versions may also be affected.

2) Some unspecified boundary errors in an included ActiveX control
can be exploited to cause a buffer overflow.

Successful exploitation may allow execution of arbitrary code.

Apply update.

1) Discovered by an anonymous person and reported via ZDI.
1-2) David Dewey and Mark Dowd, ISS X-Force.

WebEx Communications:

Zero Day Initiative:

ISS X-Force:


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Mark Rowe
IT Security Consultant
Pentest Limited

Office: +44 (0) 161 233 0100
Fax:    +44 (0) 161 233 0990
Mobile:    +44 (0) 7813 803 929


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