CVE-2017-3203 Pivotal/Spring Spring-flex's Action Message Format (AMF3) Java implementation is vulnerable to insecure deserialization
Remote attackers can execute arbitrary code via insecure deserialization in Spring-flex AMF3 implementation when controlling RMI connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-3203?
CVE-2017-3203 is a high-severity unsafe deserialization vulnerability in Pivotal/Spring Spring-flex, published on 11 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2017-3203?
2 open source packages ship an affected version, including org.springframework.flex:spring-flex. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework.flex:spring-flex Maven | All versions to 1.5.2.RELEASE | None |
org.springframework.flex:spring-flex Maven | All versions to 1.5.2.RELEASE | None |
Products include Pivotal Spring-Flex.
How do I fix CVE-2017-3203?
No fix has been published for CVE-2017-3203 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2017-3203 being exploited?
There is no known exploitation of CVE-2017-3203 in the wild and no public exploit code.
Sources
Also known as GHSA-8v4h-j42h-wfhc.