FIX: Requests that contain unescaped percent signs (%) can be used to bypass the request filtering module in IIS 7.0

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Article ID: 960728 - View products that this article applies to.
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SYMPTOMS

The classic Request.QueryString Active Server Pages (ASP) helper function (also known as the "key" function) returns values in which the function drops unescaped percent sign (%) characters. Therefore, requests that contain unescaped percent signs (%) can be used to bypass request filtering. For example, if the exec string is blocked, a malicious user can send an e%xec string that bypasses the check.

RESOLUTION

Download information

The following files are available for download from the Microsoft Download Center:

Update for Windows Server 2008 (KB960728)

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Download the Update for Windows Server 2008 package now.

Update for Windows Server 2008 for Itanium-based Systems (KB960728)

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Download the Update for Windows Server 2008 for Itanium-based Systems package now.

Update for Windows Server 2008 x64 Edition (KB960728)

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Download the Update for Windows Server 2008 x64 Edition package now.

Update for Windows Vista (KB960728)

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Download the Update for Windows Vista package now.

Update for Windows Vista for x64-based Systems (KB960728)

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Download the Update for Windows Vista for x64-based Systems package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

You must have Windows Vista Service Pack 1 or Windows Server 2008 installed to apply this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
IIS 7.0, x86
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Modrqflt.dll7.0.6001.2233137,88816-Dec-200804:29x86
Admwprox.dll7.0.6001.2233151,71216-Dec-200804:26x86
Ahadmin.dll7.0.6001.2233127,13616-Dec-200804:26x86
Appcmd.exe7.0.6001.22331154,11216-Dec-200802:42x86
Appcmd.xmlNot Applicable3,65418-Dec-200721:00Not Applicable
Applicationhost.configNot Applicable7,98918-Dec-200721:00Not Applicable
Appobj.dll7.0.6001.22331311,80816-Dec-200804:26x86
Aspnetca.exe7.0.6001.22331182,78416-Dec-200802:42x86
Aspnet_schema.xmlNot Applicable38,78618-Dec-200721:00Not Applicable
Fx_schema.xmlNot Applicable26,97118-Dec-200721:00Not Applicable
Iismig.dll7.0.6001.22331209,40816-Dec-200804:32x86
Iisreg.dll7.0.6001.2233189,08816-Dec-200804:27x86
Iisres.dll7.0.6001.22331193,02416-Dec-200802:42x86
Iisreset.exe7.0.6001.2233114,84816-Dec-200802:42x86
Iisrstap.dll7.0.6001.223318,19216-Dec-200804:27x86
Iisrstas.exe7.0.6001.2233131,23216-Dec-200802:42x86
Iisrtl.dll7.0.6001.22331153,60016-Dec-200804:27x86
Iissetup.exe7.0.6001.22331228,86416-Dec-200802:43x86
Iissyspr.dll7.0.6001.2233159,39216-Dec-200804:27x86
Iisutil.dll7.0.6001.22331202,75216-Dec-200804:27x86
Iis_schema.xmlNot Applicable77,83015-Dec-200823:22Not Applicable
Nativerd.dll7.0.6001.22331331,26416-Dec-200804:30x86
Redirection.configNot Applicable49018-Dec-200721:00Not Applicable
Rsca.dll7.0.6001.2233126,62416-Dec-200804:31x86
Rscaext.dll6.0.6001.2233138,91216-Dec-200804:31x86
Rscaext.xmlNot Applicable8,36318-Dec-200721:00Not Applicable
W3ctrlps.dll7.0.6001.223319,21616-Dec-200804:32x86
Wamregps.dll7.0.6001.2233110,75216-Dec-200804:32x86
IIS 7.0, x64
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Modrqflt.dll7.0.6001.2233146,59216-Dec-200804:55x64
Admwprox.dll7.0.6001.2233154,78416-Dec-200804:51x64
Ahadmin.dll7.0.6001.2233161,44016-Dec-200804:51x64
Appcmd.exe7.0.6001.22331191,48816-Dec-200803:17x64
Appcmd.xmlNot Applicable3,65418-Dec-200721:00Not Applicable
Applicationhost.configNot Applicable7,98918-Dec-200721:00Not Applicable
Appobj.dll7.0.6001.22331379,39216-Dec-200804:51x64
Aspnetca.exe7.0.6001.22331218,62416-Dec-200803:17x64
Aspnet_schema.xmlNot Applicable38,78618-Dec-200721:01Not Applicable
Fx_schema.xmlNot Applicable26,97118-Dec-200721:01Not Applicable
Iismig.dll7.0.6001.22331242,68816-Dec-200804:58x64
Iisreg.dll7.0.6001.22331111,61616-Dec-200804:53x64
Iisres.dll7.0.6001.22331193,02416-Dec-200803:17x64
Iisreset.exe7.0.6001.2233116,89616-Dec-200803:16x64
Iisrstap.dll7.0.6001.2233111,26416-Dec-200804:53x64
Iisrstas.exe7.0.6001.2233134,81616-Dec-200803:16x64
Iisrtl.dll7.0.6001.22331192,51216-Dec-200804:53x64
Iissetup.exe7.0.6001.22331280,06416-Dec-200803:17x64
Iissyspr.dll7.0.6001.2233166,56016-Dec-200804:53x64
Iisutil.dll7.0.6001.22331275,45616-Dec-200804:53x64
Iis_schema.xmlNot Applicable77,83015-Dec-200823:22Not Applicable
Nativerd.dll7.0.6001.22331416,76816-Dec-200804:56x64
Redirection.configNot Applicable49018-Dec-200721:01Not Applicable
Rsca.dll7.0.6001.2233131,23216-Dec-200804:58x64
Rscaext.dll6.0.6001.2233144,03216-Dec-200804:58x64
Rscaext.xmlNot Applicable8,36318-Dec-200721:01Not Applicable
W3ctrlps.dll7.0.6001.2233113,82416-Dec-200804:59x64
Wamregps.dll7.0.6001.2233115,87216-Dec-200804:59x64
Modrqflt.dll7.0.6001.2233137,88816-Dec-200804:29x86
Admwprox.dll7.0.6001.2233151,71216-Dec-200804:26x86
Ahadmin.dll7.0.6001.2233127,13616-Dec-200804:26x86
Appcmd.exe7.0.6001.22331154,11216-Dec-200802:42x86
Appcmd.xmlNot Applicable3,65418-Dec-200721:00Not Applicable
Appobj.dll7.0.6001.22331311,80816-Dec-200804:26x86
Aspnetca.exe7.0.6001.22331182,78416-Dec-200802:42x86
Iismig.dll7.0.6001.22331209,40816-Dec-200804:32x86
Iisreg.dll7.0.6001.2233189,08816-Dec-200804:27x86
Iisres.dll7.0.6001.22331193,02416-Dec-200802:42x86
Iisreset.exe7.0.6001.2233114,84816-Dec-200802:42x86
Iisrstap.dll7.0.6001.223318,19216-Dec-200804:27x86
Iisrtl.dll7.0.6001.22331153,60016-Dec-200804:27x86
Iissetup.exe7.0.6001.22331228,86416-Dec-200802:43x86
Iissyspr.dll7.0.6001.2233159,39216-Dec-200804:27x86
Iisutil.dll7.0.6001.22331202,75216-Dec-200804:27x86
Nativerd.dll7.0.6001.22331331,26416-Dec-200804:30x86
Rsca.dll7.0.6001.2233126,62416-Dec-200804:31x86
Rscaext.dll6.0.6001.2233138,91216-Dec-200804:31x86
W3ctrlps.dll7.0.6001.223319,21616-Dec-200804:32x86
Wamregps.dll7.0.6001.2233110,75216-Dec-200804:32x86
IIS 7.0, ia64
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Modrqflt.dll7.0.6001.2233196,25616-Dec-200804:36IA-64
Admwprox.dll7.0.6001.22331119,80816-Dec-200804:31IA-64
Ahadmin.dll7.0.6001.2233182,43216-Dec-200804:31IA-64
Appcmd.exe7.0.6001.22331404,99216-Dec-200803:03IA-64
Appcmd.xmlNot Applicable3,65418-Dec-200721:00Not Applicable
Applicationhost.configNot Applicable7,98918-Dec-200721:00Not Applicable
Appobj.dll7.0.6001.22331727,55216-Dec-200804:31IA-64
Aspnetca.exe7.0.6001.22331432,12816-Dec-200803:04IA-64
Aspnet_schema.xmlNot Applicable38,78618-Dec-200721:01Not Applicable
Fx_schema.xmlNot Applicable26,97118-Dec-200721:01Not Applicable
Iismig.dll7.0.6001.22331452,09616-Dec-200804:39IA-64
Iisreg.dll7.0.6001.22331143,87216-Dec-200804:34IA-64
Iisres.dll7.0.6001.22331193,02416-Dec-200803:03IA-64
Iisreset.exe7.0.6001.2233134,81616-Dec-200803:03IA-64
Iisrstap.dll7.0.6001.2233118,94416-Dec-200804:34IA-64
Iisrstas.exe7.0.6001.2233178,33616-Dec-200803:03IA-64
Iisrtl.dll7.0.6001.22331393,21616-Dec-200804:34IA-64
Iissetup.exe7.0.6001.22331543,23216-Dec-200803:04IA-64
Iissyspr.dll7.0.6001.22331134,65616-Dec-200804:34IA-64
Iisutil.dll7.0.6001.22331513,02416-Dec-200804:35IA-64
Iis_schema.xmlNot Applicable77,83015-Dec-200823:21Not Applicable
Nativerd.dll7.0.6001.22331899,58416-Dec-200804:37IA-64
Redirection.configNot Applicable49018-Dec-200721:01Not Applicable
Rsca.dll7.0.6001.2233174,24016-Dec-200804:39IA-64
Rscaext.dll6.0.6001.22331111,61616-Dec-200804:39IA-64
Rscaext.xmlNot Applicable8,36318-Dec-200721:01Not Applicable
W3ctrlps.dll7.0.6001.2233122,52816-Dec-200804:40IA-64
Wamregps.dll7.0.6001.2233128,16016-Dec-200804:40IA-64
Modrqflt.dll7.0.6001.2233137,88816-Dec-200804:29x86
Admwprox.dll7.0.6001.2233151,71216-Dec-200804:26x86
Ahadmin.dll7.0.6001.2233127,13616-Dec-200804:26x86
Appcmd.exe7.0.6001.22331154,11216-Dec-200802:42x86
Appcmd.xmlNot Applicable3,65418-Dec-200721:00Not Applicable
Appobj.dll7.0.6001.22331311,80816-Dec-200804:26x86
Aspnetca.exe7.0.6001.22331182,78416-Dec-200802:42x86
Iismig.dll7.0.6001.22331209,40816-Dec-200804:32x86
Iisreg.dll7.0.6001.2233189,08816-Dec-200804:27x86
Iisres.dll7.0.6001.22331193,02416-Dec-200802:42x86
Iisreset.exe7.0.6001.2233114,84816-Dec-200802:42x86
Iisrstap.dll7.0.6001.223318,19216-Dec-200804:27x86
Iisrtl.dll7.0.6001.22331153,60016-Dec-200804:27x86
Iissetup.exe7.0.6001.22331228,86416-Dec-200802:43x86
Iissyspr.dll7.0.6001.2233159,39216-Dec-200804:27x86
Iisutil.dll7.0.6001.22331202,75216-Dec-200804:27x86
Nativerd.dll7.0.6001.22331331,26416-Dec-200804:30x86
Rsca.dll7.0.6001.2233126,62416-Dec-200804:31x86
Rscaext.dll6.0.6001.2233138,91216-Dec-200804:31x86
W3ctrlps.dll7.0.6001.223319,21616-Dec-200804:32x86
Wamregps.dll7.0.6001.2233110,75216-Dec-200804:32x86

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

REFERENCES

The feature that this hotfix introduces was first introduced in the hotfix that Microsoft Knowledge Base article 957508 describes. Installing the hotfix that this article describes enables the feature that article 957508 describes. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
957508 An update is available that provides improved features for the Request Filtering module in IIS 7.0
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
For more information about how to use these enhanced features, visit the following Microsoft Web site:
http://learn.iis.net/page.aspx/504/using-enhanced-request-filtering-features-in-iis7
For more information about how to use request filtering, visit the following Microsoft Web site:
http://learn.iis.net/page.aspx/143/how-to-use-request-filtering

Properties

Article ID: 960728 - Last Review: February 3, 2009 - Revision: 2.1
APPLIES TO
  • Microsoft Internet Information Services 7.0
Keywords: 
kbsurveynew kbhotfixserver kbautohotfix kbexpertiseinter kbqfe KB960728

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