Good Morning,
I got the official notice from SPI Dynamics to day on this issue. I am in no
way slamming people at all, but the interesting response was inability to
reproduce the XAS issue.
At what point and how much support should the discoverer give to the
company? Usually when I have a bug report it is a full set of instructions
on exactly how to reproduce the issue, from OS, software running in
background, what I was clicking or typing at the time.
My question is that if we are submitting bug reports and POC code, just how
much information do we give to the vendor, especially if they say that they
can not reproduce it? If the vendor can not reproduce it, how much time and
support should the discoverer give them?
Just a curiosity question based on the idea that we are all out there
discovering things, that we will or will not give up to folks depending on
what we discover. Its the inability to reproduce the issue that interests me
the most, and what as a community should we do when no one else can verify
our results? Well out side of providing POC code, that may or may not work.
R/Dan
Sometimes MSN E-mail will indicate that the mesasge failed to be delivered.
Please resend when you get those, it does not mean that the mail box is bad,
merely that MSN mail is over worked at the time.
From: 3APA3A <3APA3A@SECURITY.NNOV.RU>
Reply-To: 3APA3A <3APA3A@SECURITY.NNOV.RU>
To: bugTraq <bugtraq@securityfocus.com>, full-disclosure@lists.grok.org.uk
Subject: [Full-disclosure] SPIDynamics WebInspect
Cross-ApplicationScripting (XAS)
Date: Tue, 26 Jul 2005 13:45:29 +0400
Dear bugTraq,
Cross application scripting attacks (data obtained from untrusted
source is sent unfiltered from trusted application to browser) in
different applications are reported by anonymous author.
In Russian version of article "XSS - WEB = Cross-Applications
Scripting" (signed (c)oded by QQLan@yandex.ru)
http://www.security.nnov.ru/articles/xas/
there are remote cross-application scripting attack in SPIDynamics
WebInspect and domain level cross-application attack with potential
privilege escalation for user with limited delegated control under OU
to domain administrator account is also described for Windows domain
group policy editor (gpedit.msc) under Windows XP and Windows Server
2003.
Below is original anonymous report for cross application scripting in
SPIDynamics WebInspect
(http://www.security.nnov.ru/Fnews30.html)
SPIDynamics WebInspect Cross-Application Scripting (XAS)
I. BACKGROUND
SPIDynamics WebInspect is powerful security assessment tool for Web
application vulnerable to XAS which
could lead to remote code execution.
II. DESCRIPTION
As many applications WebInspect uses external programs and Windows
components for different purposes.
It is very common to use COM object of Internet Explorer for render reports
and displays data. WebInspect
in not an exception.
When reports is generated, some parts of scanned site (for example URLs)
are included into HTML file
(file://C:\Program Files\SPIDynamics\WebInspect\Working\vulnerability.htm),
which opens in IE.
Because WebInspect doesn't properly normalize displayed data, part of URL
or other data can be parsed by IE
as DHTML, for example JavaScript, and leads to code execution on the
computer where scanner is installed.
III. ANALYSIS
Successful exploitation allows remote attackers to execute arbitrary script
code on the host, where
scanner is installed with privileges of user who launch the scanner. Victim
should scan site and open
report.
Typically scanner runs on administrator's or security auditor's box with a
lot of interesting data.
It possibly runs under high-privileged account.
Attacker should create specially crafted site with vulnerability to be
displayed in report.
"Vulnerable" URL should include script code. Example of such report is a
"Hidden Form Value Vulnerability
ID: 4727".
By default script is executed in Internet Security Zone of IE (not sure).
But with little effort attacker
can use predictable resource location to bypass restrictions of Internet
Zone and execute script in "My
Computer" security zone.
Example:
<script>window.open('file://C:\\Program
Files\\SPIDynamics\\WebInspect\\Working\\vulnerability.htm')</script>
Attacker can use social engineering to install full featured application,
for example new version of
"SPIDynamics Reported ActiveX".
IV. DETECTION/POC
Following asp file can be used to reproduce vulnerability:
<*****************iisstart.asp***********************>
<HTML><HEAD><BODY>
<%
if request.querystring<>"" then
response.write request.querystring
end if
%>
<form action="script>/<script>window.open(%27file://C:\\Program
Files\\SPIDynamics\\WebInspect\\Working\\vulnerability.htm%27)</script>"
method=get> Please login:<br>
<input type=submit value="Login"><br> <input type=hidden name='hidden'
value="Login"><br> </form>
</BODY></HTML>
</*****************iisstart.asp***********************>
You should change default error page to iisstart.asp (see screenshot in
attach). Scan results can be found
in attached files.
V. VENDOR RESPONSE
Initial vendor response received
VII. DISCLOSURE TIMELINE
04/15/2005 Initial vendor notification
04/15/2005 Initial vendor response
VIII. WORKAROUND
Disable Active Scripting in My Computer Zone
(http://support.microsoft.com/default.aspx?scid=kb;en;833633)
IX. LEGAL NOTICES
This advisory is being provided to you under the RFPolicy documented at
http://www.wiretrip.net/rfp/policy.html. You are encouraged to read this
policy; however, in the interim,
you have approximately 5 days to respond to this initial email.
Thanks: 3APA3A for spellcheck & malware.com for some ideas.
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