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onBeforeUpdate is called with the new user object.
You basically need to implement it in the same way as in the UserModelListener:
public void onBeforeUpdate(User newUser) throws ModelListenerException {
  try {
    User oldUser = _userLocalService.getUser(newUser.getUserId());
    List<Attribute> attributes = getModifiedAttributes(newUser, oldUser);
    if (!attributes.isEmpty())  trackChanges();
  }
  catch (Exception e) {
   throw new ModelListenerException(e);
  }
}
https://github.com/liferay/liferay-portal/blob/7.2.x/modules/apps/portal-security-audit/portal-security-audit-event-generators-user-management/src/main/java/com/liferay/portal/security/audit/event/generators/user/management/internal/model/listener/UserModelListener.java

Hi christoph!!I am having problem in implementing this. I think it is because I am using liferay 6.2  .  Can you please tell how to implement this in liferay 6.2 !!

Hi, The  problem that I am facing is that I pasted the code of christoph and imported necessary packages. But I am not able to impoort anything for auditmessagebuilder  in the  :-
if (!attributes.isEmpty())
{
AuditMessage auditMessage =AuditMessageBuilder.buildAuditMessage(EventTypes.UPDATE, User.class.getName(),newUser.getUserId(), attributes);
_auditRouter.route(auditMessage);
}
and hence not able to implement it..

So please help in how can i track what has been updated in the user ;example : firstname , lastname, email address , etc.  the code  snippet that you sent above contains the method   getModifiedAttributes(newUser, oldUser);    and in the document that you attached with it contains the definition for getModifiedAttributes(newUser, oldUser); as   :- 
protected List<Attribute> getModifiedAttributes(
            User newUser, User oldUser) {            AttributesBuilder attributesBuilder = new AttributesBuilder(
                newUser, oldUser);            attributesBuilder.add("active");
            attributesBuilder.add("agreedToTermsOfUse");
            attributesBuilder.add("comments");
            attributesBuilder.add("emailAddress");
            attributesBuilder.add("languageId");
            attributesBuilder.add("reminderQueryAnswer");
            attributesBuilder.add("reminderQueryQuestion");
            attributesBuilder.add("screenName");
            attributesBuilder.add("timeZoneId");
        
            List<Attribute> attributes = attributesBuilder.getAttributes();            if (newUser.isPasswordModified()) {
                attributes.add(new Attribute("password"));
            }            return attributes;
        }
    But here also AttributeBuilder class is not available for me. So how can i implement this code !!!!!!!!!!!!!!!!