CVE-2021-21342

XStream is a Java library to serialize objects to XML and back again. In
XStream before version 1.4.16, there is a vulnerability where the processed
stream at unmarshalling time contains type information to recreate the
formerly written objects. XStream creates therefore new instances based on
these type information. An attacker can manipulate the processed input
stream and replace or inject objects, that result in a server-side forgery
request. No user is affected, who followed the recommendation to setup
XStream’s security framework with a whitelist limited to the minimal
required types. If you rely on XStream’s default blacklist of the Security
Framework, you will have to use at least version 1.4.16.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985843&gt;