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Ubuntu Security Notice USN-4714-1
January 28, 2021

libxstream-java vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in libxstream-java.

Software Description:
- libxstream-java: Java library to serialize objects to XML and back again

Details:

Zhihong Tian and Hui Lu found that XStream was vulnerable to remote code
execution. A remote attacker could run arbitrary shell commands by
manipulating the processed input stream. (CVE-2020-26217)

It was discovered that XStream was vulnerable to server-side forgery attacks.
A remote attacker could request data from internal resources that are not
publicly available only by manipulating the processed input stream.
(CVE-2020-26258)

It was discovered that XStream was vulnerable to arbitrary file deletion on
the local host. A remote attacker could use this to delete arbitrary known
files on the host as long as the executing process had sufficient rights only
by manipulating the processed input stream. (CVE-2020-26259)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
  libxstream-java                 1.4.11.1-1ubuntu0.1

Ubuntu 18.04 LTS:
  libxstream-java                 1.4.11.1-1~18.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4714-1
  CVE-2020-26217, CVE-2020-26258, CVE-2020-26259

Package Information:
  https://launchpad.net/ubuntu/+source/libxstream-java/1.4.11.1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxstream-java/1.4.11.1-1~18.04.1