[NT] Microsoft FrontPage Server Extensions XSS (MS06-017)

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  Microsoft FrontPage Server Extensions XSS (MS06-017)
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SUMMARY

Improper user validation allows attackers to perform a XSS on Microsoft 
Front-Page.

DETAILS

Vulnerable Systems:
 * Microsoft FrontPage Server Extensions 2002 shipped on Microsoft Windows 
Server 2003 and Microsoft Windows Server 2003 Service Pack 1    
<http://www.microsoft.com/downloads/details.aspx?FamilyId=5C03F85A-5228-47FB-A338-90FA23818E08> Download the update (KB908981)
 * Microsoft FrontPage Server Extensions 2002 shipped on Microsoft Windows 
Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 
with SP1 for Itanium-based Systems    
<http://www.microsoft.com/downloads/details.aspx?FamilyId=59F15A6B-CC1B-43D5-A007-BFC9ABB63486%A0> Download the update (KB908981)
 * Microsoft FrontPage Server Extensions 2002 (x64 Edition) downloaded and 
installed on Microsoft Windows Server 2003 x64 Edition and Microsoft 
Windows XP Professional x64 Edition    
<http://www.microsoft.com/downloads/details.aspx?FamilyId=F453530D-7063-49AB-B304-9C455DE6D8DA> Download the update (KB911831)
 * Microsoft FrontPage Server Extensions 2002 (x86 Editions) downloaded 
and installed on Microsoft Windows Server 2000 Service Pack 4, Microsoft 
Windows XP Service Pack 1, and Microsoft Windows XP Service Pack 2    
<http://www.microsoft.com/downloads/details.aspx?FamilyId=F453530D-7063-49AB-B304-9C455DE6D8DA> Download the update (KB911831)
 * Microsoft SharePoint Team Services    
<http://www.microsoft.com/downloads/details.aspx?FamilyId=EEE40662-39E6-4C07-8241-1AC4F5D24FFC> Download the update (KB911701)

Immune Systems:
 * Microsoft Windows SharePoint Services
 * Microsoft FrontPage 2002
 * Microsoft FrontPage Server Extensions 2000
 * Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and 
Microsoft Windows Millennium Edition (ME)

Cross-site Scripting FrontPage Server Extensions Vulnerability -  
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0015> 
CVE-2006-0015:
The cross-site scripting vulnerability could allow an attacker to run 
client-side script on behalf of an FPSE user. The script could spoof 
content, disclose information, or take any action that the user could take 
on the affected web site. Attempts to exploit this vulnerability require 
user interaction. An attacker who successfully exploited this 
vulnerability against an administrator could take complete control of a 
Front Page Server Extensions 2002 server.

Mitigating Factors for Cross-site Scripting FrontPage Server Extensions 
Vulnerability -  
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0015> 
CVE-2006-0015:
 * By default, Microsoft Internet Information Services (IIS) 6.0 is not 
enabled on Microsoft Windows Server 2003.

 * By default, FrontPage Server Extensions are not enabled on Microsoft 
Windows Server 2003.

 * You are not vulnerable if you have installed Microsoft Internet 
Information Services (IIS) 5.0 on Windows Server 2000 Service Pack 4. You 
are also not vulnerable if you have installed Microsoft Internet 
Information Services (IIS) 5.1 on Windows XP Service Pack 1 or on Windows 
XP Service Pack2 and if you have the default installation of FrontPage 
Server Extensions 2000.

 * In a Web-based attack scenario, an attacker would have to know the name 
of the Front Page Server Extensions 2002 or SharePoint Team Services 2002 
server to inject the malicious script. An attacker would have no way to 
force users to visit a malicious Web site. Instead, an attacker would have 
to persuade them to visit the Web site, typically by getting them to click 
a link that takes them to the attacker's site.

 * The vulnerability could not be exploited automatically through e-mail. 
For an attack to be successful, a user must click a Web link that is sent 
in an e-mail message.

 * An attacker who successfully exploited this vulnerability could gain 
the same rights as the user s rights on the Front Page Server Extensions 
2002 or SharePoint Team Services 2002 server. Users whose accounts are 
configured to have fewer user rights on the system could be less impacted 
than users who operate with administrative user rights.

Workarounds for Cross-site Scripting FrontPage Server Extensions 
Vulnerability -  
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0015> 
CVE-2006-0015:
We have not identified any workarounds for this vulnerability.

FAQ for FrontPage Server Extensions Vulnerability - CVE-2006-0015:
What is the scope of the vulnerability?
This is a cross-site scripting vulnerability that could allow an attacker 
to convince a user to run a malicious script. If this malicious script is 
run, it would execute in the security context of the user. Attempts to 
exploit this vulnerability require user interaction.

The script could take any action on the user's behalf that the Web site is 
authorized to take. This could include monitoring the Web session and 
forwarding information to a third party, running other code on the user's 
system, and reading or writing cookies.

If a user has administrative user rights on the Front Page Server 
Extensions 2002 or SharePoint Team Services 2002 server, an attacker who 
successfully exploited this vulnerability could take complete control of 
an affected system. An attacker could then install programs; view, change, 
or delete data; or create new accounts with full user rights. Users whose 
accounts are configured to have fewer user rights on the system could be 
less impacted than users who operate with administrative user rights.

What causes the vulnerability?
A cross-site scripting (XSS) vulnerability is caused by the way that 
FrontPage Server Extensions handles parameter validation.

What are the FrontPage Server Extensions?
FrontPage Server Extensions is a set of tools that can be installed on a 
Web site. They allow authorized personnel to manage the server, add or 
change content, and perform other tasks. They also add functions that Web 
pages frequently use, such as search and forms support.

What is cross-site scripting?
 <http://www.microsoft.com/technet/archive/security/news/crssite.mspx> 
Cross-site scripting (XSS) is a security vulnerability that could enable 
an attacker to "inject" code into a user's session with a Website. The 
attack involves Web servers that dynamically generate HTML pages. If these 
servers embed browser input in the dynamic pages that they send back to 
the browser, these servers can be manipulated to include content in the 
dynamic pages. This will allow malicious script to be executed. Web 
browsers may perpetuate this problem through their basic assumptions of 
"trusted" sites and their use of cookies to maintain persistent state with 
the Websites that they frequent. This attack does not modify Website 
content. Instead, it inserts new, malicious script that can execute at the 
browser level in the information context that is associated with a trusted 
server.

How does cross-site scripting work?
Web pages contain text and HTML markup. Text and HTML markup are generated 
by the server and are interpreted by the client. Servers that generate 
static pages have full control over the way that the client interprets the 
pages that the server sends. However, servers that generate dynamic pages 
do not have control over the way that the client interprets the servers  
output. If untrusted content is introduced into a dynamic page, neither 
the server nor the client has sufficient information to recognize that 
this action has occurred and to take protective measures.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited the vulnerability could perform 
actions on the behalf of the user on the Web site.

Who could exploit the vulnerability?
An attacker could create an e-mail message that is specially crafted to 
try to exploit this vulnerability. An attacker could exploit the 
vulnerability by sending this specially crafted e-mail message to a user 
of a server that is running an affected software application. An attacker 
could then persuade the user to click a link in the e-mail message.

In a Web-based attack scenario, an attacker would have to know the name of 
the Front Page Server Extensions 2002 or SharePoint Team Services 2002 
server to be successful which the user has access to in order to inject 
the malicious script. An attacker would have no way to force users to 
visit a malicious Website. Instead, an attacker would have to persuade 
them to visit the Website, typically by getting them to click a link that 
takes them to the attacker's site.

What systems are primarily at risk from the vulnerability?
Workstations and servers that have Microsoft Internet Information Services 
(IIS), FrontPage Server Extensions 2002 or SharePoint Team Services 
installed are primarily at risk. Servers could be at more risk if users 
who do not have sufficient administrative permissions are given the 
ability to log on to servers and to run programs. However, best practices 
strongly discourage allowing this.

Could the vulnerability be exploited over the Internet?
Yes. An attacker could try to exploit this vulnerability over the 
Internet.

What does the update do?
The update removes the vulnerability by modifying the way that FrontPage 
Server Extensions handles HTML validation.

When this security bulletin was issued, had this vulnerability been 
publicly disclosed?
No. Microsoft received information about this vulnerability through 
responsible disclosure.

When this security bulletin was issued, had Microsoft received any reports 
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this 
vulnerability had been publicly used to attack customers and had not seen 
any examples of proof of concept code published when this security 
bulletin was originally issued


ADDITIONAL INFORMATION

The information has been provided by Microsoft Security.
The original article can be found at:  
<http://www.microsoft.com/technet/security/Bulletin/MS06-017.mspx> 
http://www.microsoft.com/technet/security/Bulletin/MS06-017.mspx



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