Debian: 2842-1: libspring-java: denial of service
Posted by Benjamin D. Thomas   
Debian 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. [More...]
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Debian Security Advisory DSA-2842-1                   security@debian.org
http://www.debian.org/security/                           Markus Koschany
January 13, 2014                       http://www.debian.org/security/faq
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Package        : libspring-java
Vulnerability  : denial of service
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2013-4152
Debian Bug     : 720902

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 users
that need to use this feature when processing XML from a
trusted source.

It was also identified that Spring MVC processed user provided
XML with JAXB in combination with a StAX XMLInputFactory
without disabling external entity resolution. External entity
resolution has been disabled in this case.

For the stable distribution (wheezy), this problem has been fixed in
version 3.0.6.RELEASE-6+deb7u1.

For the unstable distribution (sid), this problem has been fixed in
version 3.0.6.RELEASE-10.

We recommend that you upgrade your libspring-java packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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