Difference between revisions of "OWASP Java Encoder Project"

Contextual Output Encoding

<body><%= Encode.forHtml(UNTRUSTED) %></body>

<textarea name="text"><%= Encode.forHtmlContent(UNTRUSTED) %></textarea>

<input type="text" name="address" value="<%= Encode.forHtmlAttribute(UNTRUSTED) %>" />

<div style="width:<= Encode.forCssString(UNTRUSTED) %>">
<div style="background:<= Encode.forCssUrl(UNTRUSTED) %>">

 <script type="text/javascript">
 var msg = "<%= Encode.forJavaScriptBlock(UNTRUSTED) %>";
 alert(msg);
 </script>

 <button 
 onclick="alert('<%= Encode.forJavaScriptAttribute(UNTRUSTED) %>');">
 click me</button>

<a href="/search?value=<%= Encode.forUriComponent(UNTRUSTED) %>&order=1#top">

<a href="/page/<%= Encode.forUriComponent(UNTRUSTED) %>">

String url = validateURL(untrustedInput);

 <a href="<%= Encode.forHtmlAttribute(untrustedUrl) %>">
 <%= Encode.forHtmlContent(untrustedLinkName) %>
 </a>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="e" uri="https://www.owasp.org/index.php/OWASP_Java_Encoder_Project" %>
<html>
   <head>
       <title><e:forHtml value="${param.title}" /></title>
   </head>
   <body>
       <h1>${e:forHtml(param.data)}</h1>
   </body>
</html>

var javaScriptNumber = <%= javaNumber %>;

<% // option (1)
String javaNumber = (untrusted data);
Double actualNumber = Double.parseDouble(javaNumber); // don’t forget to catch NumberFormatException
%>
<script>
var jsNumber = <%= actualNumber %>;
</script>

<% // option (2)
String javaNumber = (untrusted data);
%>
<script>
var jsNumber = parseInt("<%=Encode.forJavaScript(javaNumber)%>");
</script>

<dependency>
   <groupId>org.owasp.encoder</groupId>
   <artifactId>encoder</artifactId>
   <version>1.2.1</version>
</dependency>

<dependency>
   <groupId>org.owasp.encoder</groupId>
   <artifactId>encoder-jsp</artifactId>
   <version>1.2.1</version>
</dependency>

<input value="this is the value">
<input value=`this is the value`>

<div id=a><input value="``onmouseover=alert(1)"></div> 
<div id=b></div>
<script>b.innerHTML=a.innerHTML</script>

<input value=``onmouseover=alert(1)>

<input value="" onmouseover="alert(1)">

<input value="``onmouseover=alert(1)">

<script>a.innerHTML=b.innerHTML.replace(/`/g, "`");</script>

<input value=&#96;&#96;onmouseover=alert(1)>

@@ Line 6: / Line 6: @@
 ==OWASP Java Encoder Project ==
 The OWASP Java Encoder is a Java 1.5+ simple-to-use drop-in high-performance encoder class with no dependencies and little baggage. This project will help Java web developers defend against Cross Site Scripting!
-Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts (primarily JavaScript) are injected into otherwise trusted web sites. You can read more about Cross Site Scripting here: [[Cross-site_Scripting_%28XSS%29]]. One of the primary defenses to stop Cross Site Scripting is a technique called <i>Contextual Output Encoding</i>. You can read more about Cross Site Scripting prevention here: [[XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet]].
+Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts (primarily JavaScript) are injected into otherwise trusted web sites. You can read more about Cross Site Scripting here: [[Cross-site_Scripting_%28XSS%29]]. One of the primary defenses to stop Cross Site Scripting is a technique called <i>Contextual Output Encoding</i>.  <b>WARNING</b>: Please note that XSS prevention requires other defensive strategies besides encoding! For more information, please read about Cross Site Scripting prevention here: [[XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet]].
 As of February 2017 there are no issues submitted against this project! [https://github.com/OWASP/owasp-java-encoder/issues https://github.com/OWASP/owasp-java-encoder/issues]. We actively track project issues and seek to remediate any issues that arise. The project owners feel this project is stable and ready for production use and are seeking project status promotion.

Difference between revisions of "OWASP Java Encoder Project"

Revision as of 09:58, 9 April 2018

OWASP Java Encoder Project

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