CVE-2017-3203

Public Exploit
Pivotal/Spring Spring-flex's Action Message Format (AMF3) Java implementation is vulnerable to insecure deserialization

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.

Category

8.1
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 14.02% Top 10%
Third-Party Advisory cert.org Third-Party Advisory securityweek.com Third-Party Advisory blogspot.com Third-Party Advisory securityfocus.com
Affected: Pivotal/Spring Spring-flex
Published at:
Updated at:

References

Link Tags
https://codewhitesec.blogspot.com/2017/04/amf.html exploit third party advisory mitigation
https://www.kb.cert.org/vuls/id/307983 third party advisory us government resource
http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution third party advisory
https://www.securityfocus.com/bid/97376 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2017-3203?
CVE-2017-3203 has been scored as a high severity vulnerability.
How to fix CVE-2017-3203?
To fix CVE-2017-3203, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-3203 being actively exploited in the wild?
It is possible that CVE-2017-3203 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~14% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-3203?
CVE-2017-3203 affects Pivotal/Spring Spring-flex.
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