how to prevent xss

As shown in the preceding example, we still need to take the east and west websites written in notepad slowly, although all of them belong to low-end texts.These can be found everywhere on the Internet, but I think it is still necessary to understand your own language, so it may be wrong to understand it.0X01 same-origin policyThe same-origin policy does not need to be discussed. Here we only mention a concept related to CSRF and XSS:The same-origin policy only prevents scripts from reading cont

The cookie can be hijacked. You can view the source code on the video playback page of csrf. The content entered by the user is included in the script, such as the title introduction... Since the description content allows a maximum of characters to be entered, we construct the code '} in the introduction to the published video '}; first close the previous var p and then clear the content in the introduction to prevent others from being suspicious (s

There are countless discussions about how XSS is formed, how it is injected, how it can be done, and how to prevent it. Almost every article that talks about XSS will mention how to prevent it at the end. However, most of them remain unchanged. Escape, filter, or forget something. Despite all the well-known principles,

steal a user's cookie for play, but once it steals the cookie, it then integrates some other attack methods, such as csrf, it is very likely to cause very serious consequences. The MySpace attack in that year originated from this, not to mention the theft of user identities is not a good thing for most websites. Therefore, it is necessary to prevent XSS vulnerabilities. Based on the reasons for the

only some tags are allowed, write regular expressions for attributes, For example, the src attribute of a hyperlink is restricted to regular URLs. 0 × 05 A new type XSS Defense scheme XSS defense is believed to be a pain of many programmers. It is easy to filter the angle brackets and so on, However, when writing code or joining new users, there is always negligence. After all, when the business goes onli

?????????????????. - - Url-rule>Wuyi URLDisable= "true">/disableurl1.doURL> the Url-rule> - Wu url1 url1parameter??????????? url1prefixparameter??????????????????. - - Url-rule> About URL>/url1.doURL> $ params> - paramname= "Url1parameter"Usedefender= "false" /> - paramname= "Url1prefixparameter"Useprefix= "true"Usedefender= "false" /> - params> A Url-rule> + the

There are many ways to launch XSS attacks on a Web site, and just using some of the built-in filter functions of PHP is not going to work, even if you will Filter_var,mysql_real_escape_string,htmlentities,htmlspecialchars , strip_tags These functions are used and do not necessarily guarantee absolute security. So how to prevent XSS injection? The main still need

access a link that has been tampered with by the attacker, and when the user accesses the link, the inserted attack script is executed by the user's browser to achieve the purpose of the attack;This is mainly about persistent/storage XSS vulnerability attacks3. Here is an example1) This page is a simple add page2) After saving successfully, you can go to view the database, the JavaScript code in the Memo field has been stored in the database, as foll

surprising principle, On the one hand, to shield the system may bring dangerous error echo information); (3) Blind note. It is also possible to prevent SQL injection attacks by using a regular expression to validate request parameters, and parameter binding is a good way to do so, so that malicious SQL is executed as a parameter to SQL rather than as a command. PreparedStatement in JDBC is a statement object that supports parameter binding, and is si

An XSS attack is a malicious attacker who inserts malicious HTML code into a Web page, and when a user browses to the page, the HTML code embedded inside the Web is executed to achieve the special purpose of the malicious user. In general, the use of Cross-site scripting attacks allows attackers to steal session cookies, thereby stealing web site users ' privacy, including passwords. The techniques used by XSS