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Microsoft IIS 'Malformed Extension Data in URL' Vulnerability patch MS00-030 Download

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License Freeware /
Downloads 43
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File size 1K
Date added 12-May-2000
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Microsoft has released a patch that eliminates a security vulnerability in Microsoft® Internet Information Server. The vulnerability could be used to slow the performance of an affected server, or temporarily stop it altogether. Incompliance with RFC 2396, the algorithm in IIS that processes URLs has flexibility built in to allow it to process any arbitrary sequence of file extensions or subresource identifiers (referred to in the RFC as path_segments). Byproviding an URL that contains specially-malformed file extension information, a malicious user could misuse this flexibility in order to arbitrarily increase the work factor associated with parsing the URL. This could consume much or all of the CPU availability on the server and preventuseful work from being done. The vulnerability does not provide any capability to cause the server to fail, or to add, change or delete data on it. Likewise, it provides nocapability to usurp administrative control of the web server. The slowdown would only last until the URL had been processed, at which point service would return to normal.

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