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Microsoft IIS Long URL Denial of Service Vulnerability

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Microsoft IIS Long URL Denial of Service Vulnerability

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
06/01/1997
Created
07/25/2018
Added
11/01/2004
Modified
07/31/2012

Description

Microsoft Internet Information Server is vulnerable to a denial of service. This particular denial of service affects versions 2.0, 3.0 and 4.0 of the server prior to service pack 4.

The denial of service is initiated by sending a long URL of specific length to the server; the actual length required varies between installations but is typically between 4 and 8k.

The URL which causes this issue is of the format http://server/?anything=XXXXX - note that no existing file need be requested. It appears that the condition is related to the handling of CGI variable values.

This is not a buffer overflow; a URL of specific length must be sent, anything longer or shorter will not affect the server. The threshold varies from system to system.

Solution(s)

  • http-iis-0050

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