cve/2017/CVE-2017-3203.md

### [CVE-2017-3203](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3203)
![](https://img.shields.io/static/v1?label=Product&message=Spring-flex&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=00%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-502%3A%20Deserialization%20of%20Untrusted%20Data&color=brighgreen)

### Description

The Java implementations of AMF3 deserializers in Pivotal/Spring Spring-flex derive class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A remote attacker with the ability to spoof or control an RMI server connection may be able to send serialized Java objects that execute arbitrary code when deserialized.

### POC

#### Reference
- http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution
- https://codewhitesec.blogspot.com/2017/04/amf.html
- https://www.kb.cert.org/vuls/id/307983

#### Github
- https://github.com/PalindromeLabs/Java-Deserialization-CVEs