The grey area below represents what is going to be logged in the web server‘s log file.
* Your goal is to make it like a username "admin" has succeeded into logging in.
* Elevate your attack by adding a script to the log file.
灰色框框的部分是日志输出部分，日志的记录是Login failed for username：输入的username
但是当输入的username是smith%0D%0ALogin Succeeded for username admin，如下图所示，会误认为admin账户登录成功了。
WebGoat教程学习(六)--日志欺骗（Log Spoofing）
原文：http://www.cnblogs.com/cindy-2014/p/6062909.html