Hi Fabrice,

Thanks for the hint; definitely interesting to track down. Did you already manage to trigger this behavior in BaseX (with the REST interface, or anything else)?

Best, Christian

On Wed, Mar 14, 2018 at 4:28 PM, Fabrice ETANCHAUD fetanchaud@pch.cerfrance.fr wrote:

Hello,

I found this MarkLogic post interesting,

So I forward it to the BaseX users.

I do not remember loading data I did not trust, but did somebody experience this kind of issue ?

Best regards,

Fabrice Etanchaud

De : general-bounces@developer.marklogic.com [mailto:general-bounces@developer.marklogic.com] De la part de Marcel de Kleine Envoyé : mercredi 14 mars 2018 13:43 À : general@developer.marklogic.com Objet : [MarkLogic Dev General] Marklogic XXE and XML Bomb prevention

Hello,

We have noticed Marklogic is vulnerable to xxe (entity expansion) and xml bomb attacks. When loading an malicious document using xdmp:document-insert it won’t catch these and cause either loading of unwanted external documents (xxe) and lockup of the system (xml bomb).

For example, if I load this document :

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE foo [ <!ELEMENT foo ANY >

<!ENTITY xxe SYSTEM "file:///c:/text.xml" >]>

<foo>&xxe;</foo>

The file test.xml gets nicely added to the xml document.

See OWASP and others for examples.

This is clearly a xml processing issue so the question is : can we disable this? And if so, on what levels would this be possible. Best should be system-wide.

( And if you cannot disable this, I think this is something ML should address immediately.

Thank you in advance,

Marcel de Kleine, EPAM

Marcel de Kleine

Senior Software Engineer

Office: +31 20 241 6134 x 30530 Cell: +31 6 14806016 Email: marcel_de_kleine@epam.com

Delft, Netherlands epam.com

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