(also frohoff, YSoSerial, ysoserial.net)
Ysoserial is a programming tool that can be used to exploit Java deserialization vulnerabilities. It consists of modules known as playloads. These playloads generate a serialized object that invokes some action when instantiated, compromising the system or its data.
How can Ysoserial be used to compromise data?
- Access unauthorized resources
- Execute malicious code on targeted servers
- Upload malicious files
How to spot and prevent insecure data deserialization with Ysoserial
- Implement integrity checks (e.g., digital signatures) to prevent data tampering.
- Enforce strict type constraints during deserialization.
- Restrict and monitor incoming and outgoing network connectivity from servers that deserialize.
- Log deserialization exceptions and failures.