CVE-2017-3203: Deserialization of Untrusted Data

May 13, 2022 (updated July 1, 2022)

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.

References

www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution
codewhitesec.blogspot.com/2017/04/amf.html
github.com/advisories/GHSA-8v4h-j42h-wfhc
nvd.nist.gov/vuln/detail/CVE-2017-3203
www.kb.cert.org/vuls/id/307983

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