Debian: DSA-2842-1 Critical: libspring-java DoS Due To XXE Injection

Alvaro Munoz discovered a XML External Entity (XXE) injection in the
Spring Framework which can be used for conducting CSRF and DoS attacks
on other sites.

The Spring OXM wrapper did not expose any property for disabling entity
resolution when using the JAXB unmarshaller. There are four possible
source implementations passed to the unmarshaller:

DOMSource
StAXSource
SAXSource
StreamSource

For a DOMSource, the XML has already been parsed by user code
and that code is responsible for protecting against XXE.

For a StAXSource, the XMLStreamReader has already been created
by user code and that code is responsible for protecting
against XXE.

For SAXSource and StreamSource instances, Spring processed
external entities by default thereby creating this
vulnerability.

The issue was resolved by disabling external entity processing
by default and adding an option to enable it for those usersthat need to use this feature when processing XML from a
trusted source.

It was also identified that Spring MVC processed u...