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1.? Write vulnerability programAt present, what methods do we take to solve the attack? The first method shortens the waiting time and deletes the illegal request data packets waiting in the waiting queue as soon as possible. The second method is that the first handshake message is not put into the waiting queue. We return a 32-bit unsigned integer to the client as the Seq of the second handshake. The integer is obtained by adding a serial number of the server to the parameters requested by the user (including the requested address, port, etc.). If it is a normal user, it adds 1 as ACK after receiving this integer and returns it to the server. After receiving the data, the server subtracts 1 from this ACK and then performs inverse operation to obtain various parameters. Finally, the data sent out are compared. If they are completely consistent, it means that it is an effective response and stored in the corresponding data structure, otherwise it is not. Through this method, illegal requests cannot occupy system resources.The verification code changes when recording, so if you want to use BurpSuite for replay attacks, you need to find a login website that does not need the verification code. 2.2. 2 During the experiment, first of all, according to the above analysis of replay attacks, I chose Touniu Net for the experiment. You can see that its login page does not need to enter a verification code. Then log in, And open BurpSuite to observe the intercepted login information, Forward the unwanted response in the past, Find the important information part, and the intercepted content is shown in the following figure: the circled part is my login name and encrypted password. Record the information to carry out replay attack. When accessing the login page again, only the request needs to be released again to achieve the login effect, without inputting the user name and password. The way to replay the attack is as follows, Choose Block Login Info. Right-click SendtoRepeater for a replay attack, Then enter the Repeater tab to observe, You can see that the content of the attack that you will replay appears in the request interface. Stand-alone go makes replay attacks, The return information of the page appears in the response interface, It represents the success of login authentication, as shown in the following figure: Let's modify the login information just recorded and replay it again to see how the results will be different. Here, I have deleted several digits from the user name, so the login will fail. Through the Compare tab, we can compare the page response after two logins.11　二〇三高地不过，往后我就能帮你了。收到寄件人不明的塔罗牌之时，即是连续杀人案开幕的时候，自己最珍视的人们，接连被杀害……掌握着事件关键的，是像行凶预告一般的塔罗牌谜中生谜的连续杀人事件。但是事实上，塔罗牌不仅仅是简单的杀人预告，其中包含着不可治愈的深切悲痛和强烈愤慨。血亲被害的男人。赌上一切的悲壮的复仇计划即将开始。本剧改编自伊坂幸太郎的同名小说。