> Java serialization is the process of converting a Java object’s state into a byte stream, which can be stored or transmitted and later reconstructed (deserialized) back into the original object. Serialization in Java is primarily done using the `Serializable` interface, which marks a class as serializable, allowing it to be saved to files, sent over a network, or transferred between JVMs.
[frohoff/ysoserial](https://github.com/frohoff/ysoserial) : A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization.
- [NetSPI/JavaSerialKiller](https://github.com/NetSPI/JavaSerialKiller) - Burp extension to perform Java Deserialization Attacks
- [federicodotta/Java Deserialization Scanner](https://github.com/federicodotta/Java-Deserialization-Scanner) - All-in-one plugin for Burp Suite for the detection and the exploitation of Java deserialization vulnerabilities
- [summitt/burp-ysoserial](https://github.com/summitt/burp-ysoserial) - YSOSERIAL Integration with Burp Suite
- [NickstaDB/SerialBrute](https://github.com/NickstaDB/SerialBrute) - Java serialization brute force attack tool
- [NickstaDB/SerializationDumper](https://github.com/NickstaDB/SerializationDumper) - A tool to dump Java serialization streams in a more human readable form
SnakeYAML is a popular Java-based library used for parsing and emitting YAML (YAML Ain't Markup Language) data. It provides an easy-to-use API for working with YAML, a human-readable data serialization standard commonly used for configuration files and data exchange.
In Java, ViewState refers to the mechanism used by frameworks like JavaServer Faces (JSF) to maintain the state of UI components between HTTP requests in web applications. There are 2 major implementations:
* [Synacktiv-contrib/inyourface](https://github.com/Synacktiv-contrib/inyourface) - InYourFace is a software used to patch unencrypted and unsigned JSF ViewStates.
### Encoding
| Encoding | Starts with |
| ------------- | ----------- |
| base64 | `rO0` |
| base64 + gzip | `H4sIAAA` |
### Storage
The `javax.faces.STATE_SAVING_METHOD` is a configuration parameter in JavaServer Faces (JSF). It specifies how the framework should save the state of a component tree (the structure and data of UI components on a page) between HTTP requests.
The storage method can also be inferred from the viewstate representation in the HTML body.
By default MyFaces uses DES as encryption algorithm and HMAC-SHA1 to authenticate the ViewState. It is possible and recommended to configure more recent algorithms like AES and HMAC-SHA256.
| Encryption Algorithm | HMAC |
| -------------------- | ----------- |
| DES ECB (default) | HMAC-SHA1 |
Supported encryption methods are BlowFish, 3DES, AES and are defined by a context parameter.
The value of these parameters and their secrets can be found inside these XML clauses.
- [Detecting deserialization bugs with DNS exfiltration - Philippe Arteau - March 22, 2017](https://www.gosecure.net/blog/2017/03/22/detecting-deserialization-bugs-with-dns-exfiltration/)
- [How I found a $1500 worth Deserialization vulnerability - Ashish Kunwar - August 28, 2018](https://medium.com/@D0rkerDevil/how-i-found-a-1500-worth-deserialization-vulnerability-9ce753416e0a)
- [Jackson CVE-2019-12384: anatomy of a vulnerability class - Andrea Brancaleoni - July 22, 2019](https://blog.doyensec.com/2019/07/22/jackson-gadgets.html)
- [Java-Deserialization-Cheat-Sheet - Aleksei Tiurin - May 23, 2023](https://github.com/GrrrDog/Java-Deserialization-Cheat-Sheet/blob/master/README.md)
- [JSF ViewState upside-down - Renaud Dubourguais, Nicolas Collignon - March 15, 2016](https://www.synacktiv.com/ressources/JSF_ViewState_InYourFace.pdf)
- [Misconfigured JSF ViewStates can lead to severe RCE vulnerabilities - Peter Stöckli - August 14, 2017](https://www.alphabot.com/security/blog/2017/java/Misconfigured-JSF-ViewStates-can-lead-to-severe-RCE-vulnerabilities.html)
- [Misconfigured JSF ViewStates can lead to severe RCE vulnerabilities - Peter Stöckli - August 14, 2017](https://www.alphabot.com/security/blog/2017/java/Misconfigured-JSF-ViewStates-can-lead-to-severe-RCE-vulnerabilities.html)
- [On Jackson CVEs: Don’t Panic — Here is what you need to know - cowtowncoder - December 22, 2017](https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062#da96)
- [Pre-auth RCE in ForgeRock OpenAM (CVE-2021-35464) - Michael Stepankin (@artsploit) - June 29, 2021](https://portswigger.net/research/pre-auth-rce-in-forgerock-openam-cve-2021-35464)
- [Triggering a DNS lookup using Java Deserialization - paranoidsoftware.com - July 5, 2020](https://blog.paranoidsoftware.com/triggering-a-dns-lookup-using-java-deserialization/)
