XStream is a simple library to serialize objects to XML and back again. In affected versions 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 version 14 to 8. No user is affected, who followed the recommendation to setup XStreams security framework with a whitelist limited to the minimal required types. If you rely on XStreams default blacklist of the Security Framework, you will have to use at least version 1.4.18.
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xstream | Xstream_project | * | 1.4.18 (excluding) |
| Red Hat Data Grid 8.3.0 | RedHat | xstream | * |
| Red Hat Enterprise Linux 7 | RedHat | xstream-0:1.3.1-16.el7_9 | * |
| Red Hat Integration | RedHat | xstream | * |
| Red Hat Integration Camel Quarkus | RedHat | xstream | * |
| RHDM 7.12.0 | RedHat | xstream | * |
| RHPAM 7.12.0 | RedHat | xstream | * |
| Libxstream-java | Ubuntu | bionic | * |
| Libxstream-java | Ubuntu | focal | * |
| Libxstream-java | Ubuntu | hirsute | * |
| Libxstream-java | Ubuntu | impish | * |
| Libxstream-java | Ubuntu | trusty | * |
| Libxstream-java | Ubuntu | xenial | * |
It is often convenient to serialize objects for communication or to save them for later use. However, deserialized data or code can often be modified without using the provided accessor functions if it does not use cryptography to protect itself. Furthermore, any cryptography would still be client-side security – which is a dangerous security assumption. Data that is untrusted can not be trusted to be well-formed. When developers place no restrictions on “gadget chains,” or series of instances and method invocations that can self-execute during the deserialization process (i.e., before the object is returned to the caller), it is sometimes possible for attackers to leverage them to perform unauthorized actions, like generating a shell.