MS01-044: Patch available for SSI privilege elevation vulnerability (301625)


The information in this article applies to:

  • Microsoft Internet Information Services 5.0
  • Microsoft Internet Information Server 4.0
This article was previously published under Q301625
We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx

Note If you download and install the fix included in this article onto a computer running IIS 3.0, the IIS 3.0 Web, FTP, and Proxy services will fail. This fix should only be applied to computers running IIS 4.0 or later. To verify your version of IIS, follow these steps:
  1. Click Start, click Settings, and then click Control Panel.
  2. Double-click Administrative Tools, and then click the Services icon.
  3. In the Services list, locate the IIS Admin Service.
If the IIS Admin Service is listed, download and apply the fix included in this article.

If the IIS Admin Service is not listed, your version of IIS is not vulnerable to the problem that is corrected by these fixes. Therefore, no action is needed. IIS 3.0 is not vulnerable and does not need this fix.

If you accidentally install this fix on IIS 3.0 it can be successfully removed via Add/Remove Programs in Control Panel to return the web site to its correct functioning.

SYMPTOMS

In Internet Information Services (IIS) 5.0 and Internet Information Server (IIS) 4.0, a buffer overrun vulnerability exists that an attacker could exploit to gain complete control over an affected server and take any type of action on it. This vulnerability can only be exploited by code that is running on the server. As a result, the attacker would need to already have the ability to install software on the server in order to exploit the vulnerability. Best practices strongly recommend that you never allow an untrusted user to install software on a Web server.

CAUSE

This vulnerability occurs because the code that processes server-side include files contains an unchecked buffer. If a server-side file that contains a malformed server-side include directive is installed on an affected server, an attacker could cause the buffer to overflow the next time the file is requested by a user.

RESOLUTION

Internet Information Services 5.0

To resolve this problem, obtain the latest service pack for Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to obtain the latest Windows 2000 Service Pack

To resolve this problem, either obtain the hotfix referenced in this section or Windows 2000 Security Rollup Package 1 (SRP1). For more information about SRP1, click the following article number to view the article in the Microsoft Knowledge Base:

311401 Windows 2000 Security Rollup Package 1 (SR about SRP1), January 2002

The following file is available for download from the Microsoft Download Center:

DownloadDownload Q301625_W2K_SP3_x86_en.exe now

NOTE: This patch can be installed on systems running Windows 2000 Service Pack 1 or Windows 2000 Service Pack 2.

Release Date: August 15, 2001

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. The English version of this fix should have the following file attributes or later:
Date         Time   Version        Size    File name
   ------------------------------------------------------
   06-Aug-2001  17:10  5.0.2195.4051  245,520  ADSIIS.DLL
   06-Aug-2001  17:10  5.0.2195.4051  333,072  ASP.DLL
   29-May-2001  19:37  4.0.2.4701     593,976  FP4AUTL.DLL
   06-Aug-2001  17:10  5.0.2195.3649  299,792  FSCFG.DLL
   06-Aug-2001  17:10  5.0.2195.4051    8,464  FTPCTRS2.DLL
   06-Aug-2001  17:10  5.0.2195.4051    6,416  FTPMIB.DLL
   06-Aug-2001  17:10  5.0.2195.4051  246,032  HTTPEXT.DLL
   06-Aug-2001  17:10  5.0.2195.4051    9,488  HTTPMIB.DLL
   06-Aug-2001  17:10  5.0.2195.4051   56,592  HTTPODBC.DLL
   06-Aug-2001  17:10  5.0.2195.3649  121,104  IDQ.DLL
   06-Aug-2001  17:10  5.0.2195.4063  122,640  IISRTL.DLL
   06-Aug-2001  17:10  5.0.2195.4051   13,584  INFOADMN.DLL
   06-Aug-2001  17:10  5.0.2195.4051  245,520  INFOCOMM.DLL
   06-Aug-2001  17:10  5.0.2195.4051   62,736  ISATQ.DLL
   06-Aug-2001  17:10  5.0.2195.3649   46,352  ISM.DLL
   06-Aug-2001  17:10  5.0.2195.3649   76,560  MSW3PRT.DLL
   30-May-2001  18:40  5.0.2195.3651    6,928  SCHMUPD.EXE
   14-Jun-2001  22:44  5.0.2195.3747   41,232  SSINC.DLL
   06-Aug-2001  17:10  5.0.2195.4051    7,440  W3CTRS.DLL
   06-Aug-2001  17:10  5.0.2195.4051  353,552  W3SVC.DLL

Internet Information Server 4.0

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that you determine are at risk of attack. Evaluate the computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to the computer. See the associated Microsoft Security Bulletin to help determine the degree of risk. This hotfix may receive additional testing. If the computer is sufficiently at risk, we recommend that you apply this hotfix now.

To resolve this problem immediately, download the hotfix by following the instructions later in this article or contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The following file is available for download from the Microsoft Download Center:

DownloadDownload Q301625i.exe now

Note Q301625is.exe contains the Symbols files.

Compaq Array Controller Users: If you have installed the Compaq Array Controller Driver (Cpqarray.sys) from the Compaq Web Site, Compaq FTP Site, or Compaq SmartStart, please see the following article in the Microsoft Knowledge Base for information on how to resolve this problem:

305228 "STOP 0xA" occurs after applying Windows NT 4.0 Security Rollup Package

Note This patch can be installed on systems running Windows NT 4.0 Service Pack 5 or Windows NT 4.0 Service Pack 6a.

Release Date: August 15, 2001

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. The English version of this fix should have the following file attributes or later:
Date         Time   Version        Size     File name
   --------------------------------------------------------
   10-Aug-2001  12:46  4.2.769.1      214,544  ADSIIS.DLL
   10-Aug-2001  12:47  4.2.769.1      330,672  ASP.DLL
   02-Apr-2001  16:55  4.0.2.4701     593,976  FP4AUTL.DLL
   10-Aug-2001  12:46  4.2.769.1       81,888  FTPSVC2.DLL
   10-Aug-2001  12:46  4.2.769.1       55,392  HTTPODBC.DLL
   13-Jul-2001  16:14  5.0.1782.4     193,296  IDQ.DLL
   10-Aug-2001  12:46  4.2.769.1       98,912  IISCHEMA.DLL
   10-Aug-2001  12:45  4.2.769.1       63,472  IISLOG.DLL
   10-Aug-2001  12:45  4.2.769.1      185,792  INFOCOMM.DLL
   10-Aug-2001  12:45  4.2.769.1       29,520  ISCOMLOG.DLL
   10-Aug-2001  12:48  4.2.769.1       54,560  ISM.DLL
   02-Apr-2001  16:55  4.0.1381.7086  375,056  KERNEL32.DLL
   10-Aug-2001  12:49  4.2.769.1        9,680  SCHMUPD.EXE
   10-Aug-2001  12:46  4.2.769.1       38,256  SSINC.DLL
   10-Aug-2001  12:46  4.2.769.1       25,360  SSPIFILT.DLL
   10-Aug-2001  12:46  4.2.769.1      229,536  W3SVC.DLL
   10-Aug-2001  12:45  4.2.769.1       88,032  WAM.DLL

If you apply this security patch to a server that is running Exchange 5.5 with Outlook Web Access (OWA), all OWA clients receive a message that states that the client password will expire in 0 days.

To resolve this, follow these steps after you apply the patch:
  1. Locate C:\Exchsrvr\Webdata\USA.
  2. Create a copy of the Root.asp file (for backup purposes only).
  3. Edit Root.asp.
  4. Locate the following line:
    if cint(days) < 0 then days = 10000
  5. Change the line to the following:
    if cint(days) < 1 then days = 10000
  6. Save the file.
  7. Stop the browser (that is, the OWA client).
  8. Log on to OWA again.

STATUS

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Internet Information Services 5.0 and Internet Information Server 4.0. This problem was first corrected in Windows 2000 Service Pack 3.

MORE INFORMATION

This patch also contains fixes for the problems described in the following Microsoft Knowledge Base article:

297860 IIS 5.0 Security and Post-Windows NT 4.0 SP5 IIS 4.0 Patch Rollup

For more information on this vulnerability, see the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/ms01-044.mspx

For more information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:

265173 The Datacenter program and Windows 2000 Datacenter server product

For more information about how to install multiple hotfixes with only one reboot, click the following article number to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to install multiple hotfixes with one reboot

Modification Type:MinorLast Reviewed:10/10/2006
Keywords:kbHotfixServer kbQFE kbbug kbfix KbSECBulletin KbSECHack kbSecurity KbSECVulnerability kbWin2000PreSP3Fix kbWin2000sp3fix KB301625
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