# Zkar | A Java Serialization Protocol Analysis Tool Implement In Go **URL:** \ **Category:** Tools & Scripts\ **Tags:** tools, programming, freebies\ **Created:** [March 30, 2022, 1:04pm UTC](https://onehack.st/t/zkar-a-java-serialization-protocol-analysis-tool-implement-in-go/217628 "2022-03-30T13:04:34Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![TheStrength](https://onehack.st/user_avatar/onehack.st/thestrength/32/46753_2.png) [@TheStrength](https://onehack.st/u/TheStrength)\ **Post date:** [March 30, 2022, 1:04pm UTC](https://onehack.st/t/zkar-a-java-serialization-protocol-analysis-tool-implement-in-go/217628/1 "2022-03-30T13:04:35Z")
![image](https://onehack.st/uploads/default/original/3X/0/b/0b8644f5e7b967a8f26887ac69ba849a936d1903.jpeg) ZKar is a Java serialization protocol analysis tool implement in Go. This tool is still **work in progress** , so no complete API document and contribution guide. ZKar provides: - A Java serialization payloads parser and viewer in pure Go, no CGO or JDK is required - From the Java serialization protocol to a Go struct - A Go library that can manipulate the Java serialization data - WIP: [ysoserial](https://github.com/frohoff/ysoserial) implement in Go - WIP: Java class bytecodes parser, viewer and manipulation - WIP: An implementation of RMI/LDAP in Go ## 📦 Installing Using ZKar is easy. use `go get` to install the ZKar along with the library and its dependencies: go get -u [github.com/phith0n/zkar](http://github.com/phith0n/zkar) Next, use `github.com/phith0n/zkar/*` in your application: package main import ( “fmt” “[github.com/phith0n/zkar/serz](http://github.com/phith0n/zkar/serz)” “io/ioutil” “log” ) func main() { data, \_ := ioutil.ReadFile(“./testcases/ysoserial/CommonsCollections6.ser”) serialization, err := serz.FromBytes(data) if err != nil { log.Fatal(“parse error”) } fmt.Println(serialization.ToString()) } ## 💻 Command line utility tool ZKar also provides a command line utility tool that you can use it directly: $ go run main.go NAME: zkar - A Java serz tool USAGE: main [global options] command [command options] [arguments…] COMMANDS: generate generate Java serz attack payloads dump parse the Java serz streams and dump the struct help, h Shows a list of commands or help for one command GLOBAL OPTIONS: --help, -h show help (default: false) For example, you are able to dump the payload CommonsBeanutils3 from ysoserial like: $ go run main.go dump -f “$(pwd)/testcases/ysoserial/CommonsBeanutils3.ser” [![asciicast](https://camo.githubusercontent.com/30972d21736f6e5375027d395fda27c31c6dc8a8a52d174cd56d9cc8d16f36db/68747470733a2f2f61736369696e656d612e6f72672f612f5a6c726731794167686a676175476c6f67776d6246357650352e737667)](https://asciinema.org/a/Zlrg1yAghjgauGlogwmbF5vP5) ## 🛠 Tests ZKar is a well-tested tool that passed all ysoserial generated gadgets parsing and rebuilding tests. It means that gadget generating by ysoserial can be parsed by ZKar, and parsed struts can be converted back into bytes string which is equal to the original one. | Gadget | Package | Parse | Rebuild | Parse Time | | --- | --- | --- | --- | --- | | AspectJWeaver | ysoserial | ✅ | ✅ | 80.334µs | | BeanShell1 | ysoserial | ✅ | ✅ | 782.613µs | | C3P0 | ysoserial | ✅ | ✅ | 98.321µs | | Click1 | ysoserial | ✅ | ✅ | 573.298µs | | Clojure | ysoserial | ✅ | ✅ | 72.415µs | | CommonsBeanutils1 | ysoserial | ✅ | ✅ | 461.15µs | | CommonsCollections1 | ysoserial | ✅ | ✅ | 64.484µs | | CommonsCollections2 | ysoserial | ✅ | ✅ | 508.918µs | | CommonsCollections3 | ysoserial | ✅ | ✅ | 564.071µs | | CommonsCollections4 | ysoserial | ✅ | ✅ | 535.449µs | | CommonsCollections5 | ysoserial | ✅ | ✅ | 137.609µs | | CommonsCollections6 | ysoserial | ✅ | ✅ | 68.753µs | | CommonsCollections7 | ysoserial | ✅ | ✅ | 178.549µs | | FileUpload1 | ysoserial | ✅ | ✅ | 35.39µs | | Groovy1 | ysoserial | ✅ | ✅ | 150.991µs | | Hibernate1 | ysoserial | ✅ | ✅ | 789.674µs | | Hibernate2 | ysoserial | ✅ | ✅ | 168.624µs | | JBossInterceptors1 | ysoserial | ✅ | ✅ | 632.581µs | | JRMPClient | ysoserial | ✅ | ✅ | 32.967µs | | JRMPListener | ysoserial | ✅ | ✅ | 38.263µs | | JSON1 | ysoserial | ✅ | ✅ | 2.157225ms | | JavassistWeld1 | ysoserial | ✅ | ✅ | 468.596µs | | Jdk7u21 | ysoserial | ✅ | ✅ | 355.01µs | | Jython1 | ysoserial | ✅ | ✅ | 216.862µs | | MozillaRhino1 | ysoserial | ✅ | ✅ | 1.775193ms | | MozillaRhino2 | ysoserial | ✅ | ✅ | 409.124µs | | Myfaces1 | ysoserial | ✅ | ✅ | 22.997µs | | Myfaces2 | ysoserial | ✅ | ✅ | 38.131µs | | ROME | ysoserial | ✅ | ✅ | 485.804µs | | Spring1 | ysoserial | ✅ | ✅ | 797.469µs | | Spring2 | ysoserial | ✅ | ✅ | 358.041µs | | URLDNS | ysoserial | ✅ | ✅ | 21.502µs | | Vaadin1 | ysoserial | ✅ | ✅ | 438.729µs | | Wicket1 | ysoserial | ✅ | ✅ | 23.509µs | | JDK8u20\* | pwntester | ✅ | ✅ | 529.3µs | Notice: For parsing JDK8u20 payload, you should add `--jdk8u20` flag to `dump` command. As the payload is not a valid serialized data stream, it’s necessary to tell ZKar patches the data through this flag. ## 📝 TODO - Java bytecodes parser and generator - JDK/JRE 8u20 Gadget supporting - Serialization payloads generator - An implementation of RMI/LDAP in Go ## ⚖ License ZKar is released under the MIT license. See [LICENSE](https://github.com/phith0n/zkar/blob/master/LICENSE) ## 👀 See Also - [SerializationDumper](https://github.com/NickstaDB/SerializationDumper): A tool to dump and rebuild Java serialization streams and Java RMI packet contents in a more human readable form. - [ysoserial](https://github.com/frohoff/ysoserial): A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization. - [Java-Deserialization-Cheat-Sheet](https://github.com/GrrrDog/Java-Deserialization-Cheat-Sheet): The cheat sheet about Java Deserialization vulnerabilities ## GitHub: > **[GitHub - phith0n/zkar: ZKar is a Java serialization protocol analysis...](https://github.com/phith0n/zkar)** > > ZKar is a Java serialization protocol analysis tool implement in Go.