ASP.NET Security Vulnerability (1.0 - 4.0)

It's very important, check it out if you haven't take any action yet:

• http://weblogs.asp.net/scottgu/archive/2010/09/18/important-asp-net-security-vulnerability.aspx
• http://www.microsoft.com/technet/security/advisory/2416728.mspx 
• http://weblogs.asp.net/scottgu/archive/2010/09/20/frequently-asked-questions-about-the-asp-net-security-vulnerability.aspx

<configuration>
  <system.web>
    <customErrors mode="On" defaultRedirect="~/error.html" />
  </system.web>
</configuration>