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CERT Coordination Center

Microsoft Internet Information Server (IIS) vulnerable to buffer overflow via malformed server-side include directive

Vulnerability Note VU#630531

Original Release Date: 2002-07-13 | Last Revised: 2002-07-13

Overview

A buffer overflow in the code that processes server-side include files on IIS 4.0 and IIS 5.0 could allow an intruder to execute code with the privileges of the web server.

Description

A buffer overflow exists in the code that processes server side include directives on IIS versions 4 and 5. An intruder who can create or modify files on the web server can subsequently use this buffer overflow to execute arbitrary code with the privileges of the web server. Quoting from Microsoft Security Bulletin MS01-044:

A buffer overrun vulnerability involving the code that performs server-side include (SSI) directives. An attacker who had the ability to place content onto a server could include a malformed SSI directive that, when the content was processed, would result in code of the attacker’s choice running in Local System context.

Under ordinary circumstances, only web administrators would be able to create or modify the necessary files.

Impact

An intruder can execute arbitrary code with the privileges of the web server.

Solution

Apply a patch as described in http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS01-044.asp. Alternately, Microsoft has indicated this issue will be addressed in Windows 2000 service pack 3.

Vendor Information

630531
 
Affected   Unknown   Unaffected

Microsoft Corporation

Updated:  July 13, 2002

Status

  Vulnerable

Vendor Statement

See http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS01-044.asp.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Credit

Thanks to the NSFocus Team for reporting this vulnerability and to Microsoft for the information contained in their bulletin.

This document was written by Shawn V Hernan.

Other Information

CVE IDs: CVE-2001-0506
Severity Metric: 12.66
Date Public: 2001-08-15
Date First Published: 2002-07-13
Date Last Updated: 2002-07-13 21:36 UTC
Document Revision: 12

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