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AUSCERT External Security Bulletin Redistribution
ESB-2002.228 -- Macromedia Product Security Bulletin (MPSB02-01)
Certain DOS Reserved Filenames May Cause ColdFusion to Display the
Physical Web Root Directory when ColdFusion is Used with Microsoft IIS.
13 May 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: ColdFusion Server for Windows 4.x (All Editions)
ColdFusion Server for Windows 5 (All Editions)
Vendor: Macromedia
Operating System: Windows
Impact: Access Privileged Data
Access Required: Remote
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Macromedia Product Security Bulletin (MPSB02-01)
Certain DOS reserved filenames may cause ColdFusion to display the physical
web root directory when ColdFusion is used with Microsoft IIS.
Originally Posted: May 9, 2002
Last Updated: May 9, 2002
Summary
Certain DOS reserved filenames, such as NUL or PRN, can cause ColdFusion
to display the path to the web root directory in an error message.
For example:
Error Diagnostic Information
Cannot open CFML file
The requested file "c:inetpubwwwrootNUL.cfm" cannot be found.
When two or more periods are used in the filename, a different message is
displayed:
Error Diagnostic Information
The template specification, 'c:InetPubwwwrootNUL..cfm', is illegal.
Information about the web root location does not by itself grant
unauthorized access. This information could potentially be useful in
conjunction with some other vulnerability, especially if the web root has
been changed from the default location: c:Inetpubwwwroot.
Issue
Two solutions are available to prevent IIS from passing DOS reserved
filenames to ColdFusion for processing.
Install and configure the Microsoft URLScan Security Tool
Change IIS properties to check that files exist
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Method 1 - The Microsoft URLScan utility The URLScan IIS Security Tool
and instructions is available at
http://www.microsoft.com/technet/security/tools/URLscan.asp
To configure URLScan to prohibit DOS reserved filenames, add the following
entries to the urlscan.ini file located in
C:WINNTsystem32inetsrvurlscan.
[DenyUrlSequences]
/NUL. ; Don't allow DOS reserved filenames as valid files
/COM1.
/COM2.
/COM3.
/LPT1.
/LPT2.
/PRN.
/AUX.
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Method 2 - IIS Check that file exists
In the IIS Properties dialog:
choose: Master Properties for [WWW Service]
select: [Edit]
select: [Home Directory] tab
select: [Configuration] button
find: Application Mappings for:
.cfm C:CFUSIONiniscf.dll ALL
select: [Edit]
enable: [Check that file exists] checkbox
select: [OK]
When prompted - apply this change to all virtual directories which can
contain ColdFusion templates
Repeat this procedure to change the Application Mappings for:
.dbm C:CFUSIONiniscf.dll ALL
This second method may have two disadvantages:
The IIS error page will display for non-existent template, instead of the
ColdFusion error page CFGRAPH cannot be used to create graphs as .jpg
(JPEG) files
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Affected Software Versions
ColdFusion Server for Windows 4.x , 5 (All Editions)
What Macromedia is Doing
Macromedia has notified customers of the security issues through standard
communication channels.
What Customers Should Do Customers are advised to implement one of the two
methods described if disclosure of the IIS web root is a security concern.
Revisions
May 9, 2002 -- Bulletin first created.
Reporting Security Issues Credit
Macromedia would like to thank KPMG in Frederiksberg, Denmark for bringing
this to our attention.
Reporting Security Issues
Macromedia is committed to addressing security issues and providing
customers with the information on how they can protect themselves. If you
identify what you believe may be a security issue with a Macromedia
product, please send an email to secure@macromedia.com. We will work to
appropriately address and communicate the issue.
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When Macromedia becomes aware of a security issue that we believe
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when appropriate. Typically this notification will be in the form of a
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For additional information on security issues at Macromedia, please visit:
http://www.macromedia.com/security.
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Macromedia reserves the right, from time to time, to update the information
in this document with current information.
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