// Deserialization ois.readObject();
: The official source code and releases for ysoserial are hosted on GitHub by Chris Frohoff.
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: If you specifically need version 0.0.4 features, you can clone the repository and check out that specific tag:
While version 0.0.4 is quite old (dating back to 2016), you can find it and more recent releases on the Official ysoserial GitHub Repository . ysoserial-0.0.4-all.jar ysoserial-0.0.4-all.jar download
java -jar ysoserial-0.0.4-all.jar CommonsCollections1 'calc.exe' > payload.bin Use code with caution.
For safety and the latest features, you should always download from the official source. Official GitHub Releases
If a specific pre-compiled version like 0.0.4 is unavailable or you want to ensure the integrity of the binary, compiling it from the official source code using is the standard industry best practice. Steps to Compile: Clone the repository: git clone https://github.com Use code with caution. Navigate to the directory: cd ysoserial Use code with caution.
For maximum security, it is recommended to clone the repository and build the JAR yourself using Maven . This ensures you are running the exact code you see in the repository. // Deserialization ois
Please share your specific so I can provide the most relevant next steps. Share public link
. It contains a collection of "gadget chains" discovered in common Java libraries (like Apache Commons Collections) that can be used to execute arbitrary commands when an application unsafely deserializes data. Download and Setup Instructions 1. Official Release Download
: Keep foundational libraries (like Apache Commons Collections, Spring, and Groovy) updated to versions where known gadget chains have been mitigated or blocked.
Ensure you have JDK 1.7+ installed. Maven: Required to build the project from source. 2. Build the JAR If you share with third parties, their policies apply
Avoid Untrusted Input: Whenever possible, replace Java serialization with safer data formats like JSON or Protobuf.
ysoserial is a proof-of-concept tool that generates Java deserialization payloads. It exploits the fact that many Java libraries and applications deserialize untrusted data without proper validation. The tool chains together various "gadget chains"—existing classes and methods in common Java libraries (like Apache Commons Collections, Spring, Groovy, etc.)—to execute arbitrary commands or code.
Once downloaded, the tool is executed via the Java Runtime Environment. A typical command structure looks like this: java -jar ysoserial-0.0.4-all.jar [PayloadType] '[Command]'
Get-FileHash ysoserial-0.0.4-all.jar -Algorithm SHA256
| Gadget Chain | Affected Library | Common Use | | :--- | :--- | :--- | | CommonsCollections1 | Apache Commons Collections 3.1 | RCE on older Java apps (e.g., WebLogic, JBoss) | | CommonsCollections2 | Apache Commons Collections 4.0 | Bypass some early sanitization attempts | | Groovy1 | Groovy 1.7+ | RCE via MethodClosure | | Spring1 / Spring2 | Spring Framework 3.x | RCE in Spring-based Java apps |
Transition to safer data serialization formats like JSON or Protocol Buffers wherever possible. Legal and Ethical Notice