[jira] [Updated] (DERBY-6807) XXE attack possible by using XmlVTI and the XML datatype

["Bryan Pendleton (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-6807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bryan Pendleton updated DERBY-6807:
-----------------------------------
    Attachment: secureXmlVTI.diff

Attached secureXmlVTI.diff is my proposed change to
make the XmlVTI secure against external entity attacks.

It does so by disabling external entity expansion entirely,
which is a loss in functionality, but a gain in security.

Since the Derby VTI interface is public and fully extensible
(see https://db.apache.org/derby/docs/10.11/devguide/cdevspecialtfbasic.html ),
anyone who wishes to have an XmlVTI which supports external
entity expansion can simply define their own.

But the built-in Derby XmlVTI will not, for security reasons.

> XXE attack possible by using XmlVTI and the XML datatype
> --------------------------------------------------------
>
>                 Key: DERBY-6807
>                 URL: https://issues.apache.org/jira/browse/DERBY-6807
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.11.1.1
>            Reporter: Rick Hillegas
>         Attachments: error-stacktrace.out, externalGeneralEntities.diff, secureXmlVTI.diff, xmltest.diff
>
>
> The Derby XML datatype and XmlVTI can be exploited, via XXE-based attacks, to expose sensitive information or launch denial-of-service assaults. This issue has CVE id CVE-2015-1832. This issue was brought to our attention by Philippe Arteau.



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