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.net System.Security.Principal.WindowsPrincipal user namespace ldap injection

A recent scan of a .net web application detected an ldap injection vulnerability for a field that was used for a username assigned to an instance of a custom class named User. After stepping through ...
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How do I sanitize LDAP input and prevent injection attacks? What LDAP injection scenarios are possible?

In the following C# example I'm querying AD's configuration container for Exchange overrides. If the domain name in unsanitised the end user could get LDAP to read a different object then intended. ...