Andy Reek created LANG-871:
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Summary: [XSS] Possible attacks through
StringEscapeUtils.escapeEcmaScript?
Key: LANG-871
URL: https://issues.apache.org/jira/browse/LANG-871
Project: Commons Lang
Issue Type: Bug
Components: lang.*
Affects Versions: 3.1
Reporter: Andy Reek
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 the implementation used by
OWASP?
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