Advisory Weakness Curation

A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host ### Impact 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 with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. ### Patches If you rely on XStream's default blacklist of the Security Framework https://x-stream.github.io/security.html#framework, you will have to use at least version 1.4.18. ### Workarounds See workarounds https://x-stream.github.io/security.html#workaround for the different versions covering all CVEs. ### References See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for CVE-2021-39152 https://x-stream.github.io/CVE-2021-39152.html. ### Credits m0d9 of the Security Team of Alibaba Cloud found and reported the issue to XStream and provided the required information to reproduce it. ### For more information If you have any questions or comments about this advisory: * Open an issue in XStream https://github.com/x-stream/xstream/issues * Contact us at XStream Google Group https://groups.google.com/group/xstream-user

Server-Side Request Forgery (SSRF) XStream is a simple library to serialize objects to XML and back again. This vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime. Users who followed the recommendation to setup XStream's security framework with an allow list limited to the minimal required types are not impacted.