how to prevent xss attacks in javascript

This article mainly introduces xss defense. php uses httponly to defend against xss attacks. The following describes how to set HttpOnly in PHP. if you need a friend, you can refer to the concept of xss, this means that once your website has an xss vulnerability, attackers c

website is used to send your cookie information to a website that records cookies of attack nature, or you can use the XSS vulnerability of the website to embed a hidden IMG to embed such a URL. Then, your cookie will be stolen without knowing it, however, most websites now use cookies to represent users' identities. In this way, when attackers obtain cookies, they can impersonate your identities. The website has been opened. The above is a typical

on JavaScript and HTML tags (sometimes with a CSS-style XSS vector).There are generally four ways to do this: Page label comes with script Dom property comes with script Request address comes with script Enter blank break filter limit Give two little plums:The means of XSS attack defenseBecause the root of

In fact, this topic is very early to say, and found that many of the domestic PHP site has XSS loopholes. Today, I happened to see an XSS loophole in PHP5, here to summarize. By the way, friends who use PHP5 best to lay patches or upgrade them. If you don't know what XSS is, you can look here, or here (Chinese may understood some). Many domestic forums have cro

user accounts, such as machine login account, user network Bank account, all kinds of administrator account 2, control enterprise data, including read, tamper, add, delete enterprise sensitive data ability 3, the theft of business important business value of the information 4. Illegal transfer 5. Mandatory e-mail delivery 6. The website hangs the horse 7. Control the victim's machine to launch attacks on other websites Back to top 2, reason analysis

Many domestic forums have a cross-site scripting loophole, foreign also many such examples, even Google has appeared, but in early December revised. (Editor's note: For cross-site scripting exploits, readers can refer to the "detailed XSS cross-site scripting Attack"). Cross-station attacks are easy to construct, and very covert, not easy to be Chage (usually steal information immediately jump back to the o

marks, With Htmlspecialchars ($string, ent_noquotes).In addition, as far as possible to use Htmlentities, in all English time htmlentities and htmlspecialchars no difference, can achieve the goal. However, in Chinese, htmlentities translates all HTML code, Along with its unrecognized Chinese characters are also converted.Htmlentities and Htmlspecialchars These two functions of the "string support is not good, can not be converted, so with htmlentities and Htmlspecialchars converted strings can

The basic principles of XSS cross-site scripting attacks are similar to those of SQL injection attacks (in my opinion). They all use the system to execute unfiltered dangerous code, the difference is that XSS is a web script-based injection method, that is, it writes the Script attack load to the web page for execution

conversion to 16 binary is a fixed length, which for some English fonts is a waste of storage space, we see the following table to know:Unicode Symbol Range | UTF - 8 Encoding Method (hex) | (binary) 0000 0000 - 0000 007F | 0xxxxxxx 0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx 0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx 0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx JavaScript uses \u to represent the end of Unicode encoding:

in JavaScript A cookie cannot be obtained by a cookie statement. The user's input needs to be processed, allowing the user to enter only the data we expect, and the other values are filtered out. For example: In a TextBox of age, only users are allowed to enter numbers.　　and the characters outside the numbers are filtered out. HTML Encode processing of data filters or removes special HTML tags, such as: XSS