[OASIS Issue Tracker] Commented: (ODATA-461) Explicitly disallow certain XML constructs (for CSDL, ATOM) to enhance OData security

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    [ http://tools.oasis-open.org/issues/browse/ODATA-461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33947#action_33947 ] 

Evan Ireland commented on ODATA-461:
------------------------------------

At the same time, we might consider explicitly disallowing the use of xsi:schemaLocation and xsi:noNamespaceSchemaLocation, as they might be used by a client to initiate denial of service attacks (by specifying a "rogue" XSD location).


> Explicitly disallow certain XML constructs (for CSDL, ATOM) to enhance OData security
> -------------------------------------------------------------------------------------
>
>                 Key: ODATA-461
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-461
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData ATOM Format , OData CSDL
>    Affects Versions: V4.0_WD01
>            Reporter: Evan Ireland
>
> Considering the XML security vulnerabilities detailed in:
>   http://stackoverflow.com/questions/1906927/xml-vulnerabilities
> it might be prudent to explicitly disallow certain XML constructs (DOCTYPE, ENTITY definitions and processing instructions) in ATOM, CSDL and any other XML documents used by OData.
> Specifically, a server receiving an XML document from the client, and a client receiving a document from the server, would be "permitted to ignore" (or preferably, "required to reject"):
> (1)  XML DOCTYPE definitions
> (2)  XML ENTITY definitions
> (3)  XML processing instructions

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