Important: xstream

Issue Overview:

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. (CVE-2021-21342)

Affected Packages:

xstream

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update xstream to update your system.

New Packages:

noarch:  
    xstream-1.3.1-16.amzn2.0.2.noarch  
    xstream-javadoc-1.3.1-16.amzn2.0.2.noarch  
  
src:  
    xstream-1.3.1-16.amzn2.0.2.src  

Additional References

Red Hat: CVE-2021-21342

Mitre: CVE-2021-21342