5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.107 Low
EPSS
Percentile
95.0%
Intruders may be able to cause the IIS service to fail by sending a particular kind of overly-long URL.
ISAPI is a programming interface to IIS that can be used to modify or extend the behavior of IIS. Programs written using ISAPI are known as either filters or extension, depending on the way in which they’re implemented. One of the primary differences is that extensions only run when called (by a reference in a URL) whereas filters run for every URL submitted to the server. For more information on the difference between filters an extensions, see <http://msdn.microsoft.com/library/en-us/vccore/html/_core_What_Is_the_Difference_Between_an_ISAPI_Server_Extension_and_a_Filter.3f.asp>.
There is an ISAPI filter that ships as part of Microsoft Fronpage Extensions and ASP.NET that handles overly long URLs by replacing them with a null value. When IIS attempts to process the page (to send it back to the client as an error message) an access violation results. Other ISAPI filters may engage in similar behavior, which would trigger the same vulnerability. However, the only known extension to trigger this error ships with ASP.NET and Front Page Extensions. Quoting from Microsoft Security Bulletin MS02-018,
The sole ISAPI filter known to generate the error that results in the access violation ships only as part of FrontPage Server Extensions and ASP.NET. ASP.NET is not installed by default, and FPSE can be uninstalled if desired.
If you have custom extensions or filters, you may wish to examine them to see if they would trigger this behavior too.
An intruder could cause the IIS service to fail. IIS 5.0 and 5.1 will automatically restart, though a sustained attack could be mounted relatively easily; IIS 4.0 would have to be manually restarted.
Apply a patch as described in MS02-018.
521059
Filter by status: All Affected Not Affected Unknown
Filter by content: __ Additional information available
__ Sort by: Status Alphabetical
Expand all
Javascript is disabled. Click here to view vendors.
Updated: April 10, 2002
Affected
See <http://www.microsoft.com/technet/security/bulletin/ms02-018.asp>
The vendor has not provided us with any further information regarding this vulnerability.
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](<mailto:[email protected]?Subject=VU%23521059 Feedback>).
Group | Score | Vector |
---|---|---|
Base | ||
Temporal | ||
Environmental |
<http://www.microsoft.com/technet/security/bulletin/MS02-018.asp>
Our thanks to Microsoft Corporation, upon whose advisory this document is based.
This document was written by Shawn V. Hernan.
CVE IDs: | CVE-2002-0072 |
---|---|
Severity Metric: | 33.30 Date Public: |