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From "Henri Yandell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-572) [XSS] StringEscapeUtils.escapeHtml() must escape ' chars to &#39;
Date Sat, 19 Dec 2009 21:23:18 GMT

    [ https://issues.apache.org/jira/browse/LANG-572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792907#action_12792907
] 

Henri Yandell commented on LANG-572:
------------------------------------

Even in 2.4 this could easily be:

<input type='text' name='input' value='<%=StringEscapeUtils.escapeHtml(request.getParameter("input")).replaceAll("'",
"\\'")%>'>

> [XSS] StringEscapeUtils.escapeHtml() must escape ' chars to &#39; 
> ------------------------------------------------------------------
>
>                 Key: LANG-572
>                 URL: https://issues.apache.org/jira/browse/LANG-572
>             Project: Commons Lang
>          Issue Type: Improvement
>          Components: lang.*
>    Affects Versions: 2.4
>         Environment: Operating System: All
> Platform: All 
>            Reporter: Keisuke Kato
>            Priority: Minor
>
> If developers putting untrusted data into attribute values using the single quote character
' and StringEscapeUtils.escapeHtml() like:
> <input type='text' name='input' value=*'<%=StringEscapeUtils.escapeHtml(request.getParameter("input"))%>'*>
> Then, the attacker is able to break out of the HTML attribute context like:
> hxxp://example.org/?input=*' onfocus='alert(document.cookie);' id='*
> <input type='text' name='input' value='*'onfocus='alert(document.cookie);'id='*'>
> I think [LANG\-122|https://issues.apache.org/jira/browse/LANG-122] is not truly fixed
from this aspect (XSS).

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