Microsoft IIS 4.0, circa March 2000, contained a vulnerability that allowed an intruder to consume unlimited memory on a vulnerable server.
Older versions of IIS 4.0, circa March 2000, contained a vulnerability in the chunked-encoding transfer mechanism that permitted an intruder to allocate unlimited memory on the server. Quoting from Microsoft security bulletin MS00-018:
_IIS 4.0 supports chunked encoding transfers, but does not limit the size of the buffer that can be reserved. This would allow a malicious user to request an extremely large buffer for a POST or PUT operation, but never actually send data, thereby blocking memory on the server that had been allocated to the session. _
This would not permit an intruder to execute code.
Intruders can interrupt the ordinary operation of a vulnerable IIS 4.0 server, potentially preventing it from responding to legitimate requests. Additionally, an intruder may be able to degrade the overall performance of other process on the machine.
Apply a patch as described in MS00-018.
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Updated: June 13, 2002
The vendor has not provided us with any further information regarding this vulnerability.
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Group | Score | Vector
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Temporal | |
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Thanks to Petteri Stenius for reporting this vulnerability.
This document was written by Shawn V Hernan based on information provided by Microsoft in MS00-018.
CVE IDs: | CVE-2000-0226
Severity Metric: | 2.62
Date Public: | 2000-03-20
Date First Published: | 2002-06-13
Date Last Updated: | 2002-06-13 18:42 UTC
Document Revision: | 3