Preventing log evasion in IIS

Monday, 29 August 2005, 4:18 PM EST

While performing a security review of Microsoft Internet Information Server (IIS), I started to explore IIS's logging capabilities and how they worked. Months earlier I discovered an issue in Sun One Application server that allowed an attacker to evade certain logging functionality by sending a carefully crafted request. With this in mind, I started looking at IIS to see if it had similar issues. I discovered that if an attacker sends more then 4,097 characters to any logged field, IIS will substitute the data within that field with three periods. (I.E., ... )

By Robert Auger at the Web Application Security Consortium.

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