A libxstream-java security update has been released for Debian GNU/Linux 9 LTS to address several security vulnerabilities.

DLA 2507-1: libxstream-java security update

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Debian LTS Advisory DLA-2507-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
December 31, 2020   https://wiki.debian.org/LTS
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Package : libxstream-java
Version : 1.4.11.1-1+deb9u1
CVE ID : CVE-2020-26258 CVE-2020-26259
Debian Bug : 977625 977624

Several security vulnerabilities were discovered in XStream, a Java library to
serialize objects to XML and back again.

CVE-2020-26258

XStream is vulnerable to a Server-Side Forgery Request which can be
activated when unmarshalling. The vulnerability may allow a remote attacker
to request data from internal resources that are not publicly available
only by manipulating the processed input stream.

CVE-2020-26259

Xstream is vulnerable to an Arbitrary File Deletion on the local host when
unmarshalling. The vulnerability may allow a remote attacker to delete
arbitrary known files on the host as long as the executing process has
sufficient rights only by manipulating the processed input stream.

For Debian 9 stretch, these problems have been fixed in version
1.4.11.1-1+deb9u1.

We recommend that you upgrade your libxstream-java packages.

For the detailed security status of libxstream-java please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libxstream-java

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS