[jira] [Updated] (LANG-757) StringEscapeUtils.unescapeHtml: handle HTML escapes without semicolon

["Duncan Jones (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duncan Jones updated LANG-757:
------------------------------

    Attachment: commons-lang3-LANG-757.patch

Attached is a patch that adds overloaded unescapeHtml3 and unescapeHtml4 methods, which accept a boolean parameter to indicate if semicolons are optional (plus tests).
                
> StringEscapeUtils.unescapeHtml: handle HTML escapes without semicolon
> ---------------------------------------------------------------------
>
>                 Key: LANG-757
>                 URL: https://issues.apache.org/jira/browse/LANG-757
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*
>    Affects Versions: 2.x
>            Reporter: Steve Hale
>            Priority: Minor
>         Attachments: commons-lang3-LANG-757.patch
>
>
> org.apache.commons.lang.StringEscapeUtils.unescapeHtml is useful in detecting and correcting Cross-Site Scripting (XSS) attempts by converting escaped chars like &# 60; or & lt; (remove spaces) into normal chars like < so patterns like HTML tags can be detected.  Many browsers will allow variations without semicolons, particularly the long UTF-8 encoding like &#0000060.  Please see: http://ha.ckers.org/xss.html
> Since this may not be standard HTML, maybe adding a boolean bLenient parameter to the method could allow better backward compatibility.

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