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Date: Fri, 25 Mar 2016 16:04:38 +0100
From: Jörg Schaible <joerg.schaible@....de>
To: oss-security@...ts.openwall.com
Subject: CVE request - XStream: XXE vulnerability
Hi all,
XStream (x-stream.github.io) is a Java library to marshal Java objects into
XML and back. For this purpose it supports a lot of different XML parsers.
Some of those can also process external entities which was enabled by
default.
An attacker could therefore provide manipulated XML as input to access data
on the file system, see
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing
Since XStream 1.4.9 all parsers are configured to ignore external entities
by default as far as such behavior is configurable:
http://x-stream.github.io/changes.html#1.4.9
Luckily XStream's default parser Xpp3 does not parse entities at all.
However, all application that use XStream >= 1.4.8 explicitly with parsers
based on StAX, W3C DOM, Dom4J, JDOM or JDOM2 were affected unless the
parsers had been properly configured manually.
Applications using XOM or explicitly BEA's old StAX reference parser are
still vulnerable, we found no way to deactivate processing of external
entities for those two.
Regards,
Jörg
On behalf of the XStream community
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