hash collisions

Hash collisions are a type of vulnerability that can affect web services, including those built on Microsoft technologies. A notable example is the Microsoft Security Advisory (2659883) addressing a hash collision attack method that could allow unauthenticated denial of service on servers running ASP.NET. This attack exploits hash tables and is not specific to Microsoft, impacting other web service software as well. The vulnerability affects all versions of Microsoft .NET Framework, though sites serving only static content or disallowing certain dynamic content types are not vulnerable. Understanding hash collisions is important for securing web applications against such denial of service threats.