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From "Rob Tompkins (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEXT-42) [XSS] Possible attacks through StringEscapeUtils.escapeEcmaScript?
Date Mon, 02 Jan 2017 15:15:58 GMT

     [ https://issues.apache.org/jira/browse/TEXT-42?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rob Tompkins updated TEXT-42:
-----------------------------
    Fix Version/s:     (was: 1.0)
                   1.x

> [XSS] Possible attacks through StringEscapeUtils.escapeEcmaScript?
> ------------------------------------------------------------------
>
>                 Key: TEXT-42
>                 URL: https://issues.apache.org/jira/browse/TEXT-42
>             Project: Commons Text
>          Issue Type: Bug
>            Reporter: Andy Reek
>              Labels: XSS
>             Fix For: 1.x
>
>
> org.apache.commons.lang3.StringEscapeUtils.escapeEcmaScript does the escape via a prefixed
'\' on all characters which must be escaped. I am not sure if this is really secure, if am
looking at the comments on https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet#RULE_.233_-_JavaScript_Escape_Before_Inserting_Untrusted_Data_into_JavaScript_Data_Values.
They say it is possible to do an attack by escape the escape. I tested this with the string
'\"' and the output was '\\\"'. Is this really ecma-/java-script secure? Or is it better to
use the implementation used by OWASP?



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