Rule Definition
For an application, if the pointers are exposed malicious code can change the value of the pointer, potentially allowing access to arbitrary locations in memory or causing application or system failures.

Remediation
try and always have these pointers as read-only, internal, or private.

Violation Code Sample

using System;

namespace SecurityRulesLibrary
{

   public class ExposedPointers
   {
      // Violation. The pointers should not be visibles
      public IntPtr Pointer1;
      public UIntPtr Pointer2;
    

}

Fixed Code Sample

using System;

namespace SecurityRulesLibrary
{

   public class ExposedPointers
   {
    
      // Violation Corrected
      internal UIntPtr Pointer1;
      private UIntPtr privatePointer2;

   }
}

http://msdn.microsoft.com/en-us/library/ms182306.aspx