Select the product you need help with
MS02-018: Patch Available for Chunked Encoding Transfer Mechanism VulnerabilityArticle ID: 319688 - View products that this article applies to. This article was previously published under Q319688 We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 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 For more information about IIS 7.0, visit the following Microsoft Web site:
(http://www.microsoft.com/technet/security/prodtech/IIS.mspx)
http://www.iis.net/default.aspx?tabid=1
(http://www.iis.net/default.aspx?tabid=1)
On This PageSYMPTOMS
A buffer overrun
(http://www.microsoft.com/technet/security/bulletin/glossary.mspx)
vulnerability exists in Internet Information Server (IIS) 4.0 and Internet Information Services (IIS) 5.0. By sending a specially chosen request to an affected web server, an attacker could either disrupt Web services or gain the ability to run a program on the server. Such a program would run with full system privileges in IIS 4.0, and with fewer but nevertheless significant privileges in IIS 5.0.Customers who have used the IIS Lockdown Tool
(http://www.microsoft.com/technet/security/tools/locktool.mspx)
to configure their servers as static Web servers are already protected against this vulnerability. Likewise, the URLScan tool
(http://www.microsoft.com/technet/security/tools/urlscan.mspx)
can be configured to block the vulnerability, and the affected mechanism itself can be disabled. However, because of the seriousness of the vulnerability, Microsoft recommends that all customers install the patch, including those who have already taken these steps.
CAUSE
This vulnerability results because of an arithmetic error in the Active Server Pages (ASP) functionality that enables data to be uploaded to a Web server by using chunked encoding. The error causes IIS to allocate a buffer of the wrong size to hold incoming data, with the result that the data could overrun the end of the buffer and neighboring system memory.
RESOLUTIONPathLink Type="Bookmark" Value="IIS5"/> Internet Information Services 5.0The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:319733 To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the
Microsoft Knowledge Base:
(http://support.microsoft.com/kb/319733/EN-US/
)
MS02-018: April 2002 Cumulative Patch for Internet Information Services
260910
(http://support.microsoft.com/kb/260910/EN-US/
)
How to Obtain the Latest Windows 2000 Service Pack
Internet Information Server 4.0The update for this problem is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:319733
(http://support.microsoft.com/kb/319733/EN-US/
)
MS02-018: April 2002 Cumulative Patch for Internet Information Services
STATUSInternet Information Services 5.0Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 3.Internet Information Server 4.0Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Server 4.0.MORE INFORMATION
The vulnerability that is described in this article does not apply to Internet Information Services (IIS) 5.1. However, a variant of this vulnerability that affects IIS 4.0, 5.0, and 5.1 exists elsewhere in the chunked-encoding mechanism. This variant could be exploited in a similar manner as the preceding vulnerability, and would have the same scope. The update for these vulnerabilities is included in the "MS02-018: April 2002 Cumulative Patch for Internet Information Services". For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base: 319733
For more information about these vulnerabilities, see the following Microsoft Web site:
(http://support.microsoft.com/kb/319733/EN-US/
)
MS02-018: April 2002 Cumulative Patch for Internet Information Services
http://www.microsoft.com/technet/security/bulletin/MS02-018.mspx For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below
to view the article in the Microsoft Knowledge Base:
(http://www.microsoft.com/technet/security/bulletin/MS02-018.mspx)
265173 For additional information about how to install multiple hotfixes with only one reboot, click the article number below
to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/265173/EN-US/
)
Datacenter Program and Windows 2000 Datacenter Server Product
296861
(http://support.microsoft.com/kb/296861/EN-US/
)
Use QChain.exe to Install Multiple Hotfixes with One Reboot
PropertiesArticle ID: 319688 - Last Review: July 3, 2008 - Revision: 5.0
|
Back to the top
