ZStack is open source IaaS(infrastructure as a service) software. In ZStack before versions 3.10.12 and 4.1.6 there is a pre-auth unsafe deserialization vulnerability in the REST API. An attacker in control of the request body will be able to provide both the class name and the data to be deserialized and therefore will be able to instantiate an arbitrary type and assign arbitrary values to its fields. This issue may lead to a Denial Of Service. If a suitable gadget is available, then an attacker may also be able to exploit this vulnerability to gain pre-auth remote code execution. For additional details see the referenced GHSL-2021-087.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
| Link | Tags |
|---|---|
| https://github.com/zstackio/zstack/security/advisories/GHSA-jfvq-548h-342x | third party advisory |
| https://securitylab.github.com/advisories/GHSL-2021-087-zstack/ | third party advisory exploit |