2010 za con_ian_de_villiers
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This document discusses techniques for attacking and reversing Java applications. It begins by introducing Java archive (JAR) files, which contain compiled Java classes and can be easily extracted. It then outlines some common difficulties in reversing Java applications, such as many classes and libraries, non-clean decompilation, and obfuscated code. The document presents methods for defeating Java application signing and modifying classes. It also introduces newer attack techniques using tools like Burp and JavaSnoop that target serialized objects without requiring reversing. In the end, it claims that both traditional reversing and newer attack methodologies can enable attacking Java applications.
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The document provides an introduction to Java, highlighting its features, runtime environment, and installation process. It details the differences between Java and C++, along with new features introduced in various Java versions. Additionally, it covers the structure of Java programs, the role of the Java Virtual Machine (JVM), and tools for Java development.BP-9 Share Customization Best Practices
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2010 za con_ian_de_villiers
- 1. The JAR of Joy SensePost - 2010
- 2. `whoami` ≒ SensePost ≒ ian@sensepost.com Break some stuff Write reports about breaking some stuff Abuse the staff SensePost - 2010
- 3. Why This Talk ? ≒ import disclaimer; ≒ Not ground breaking stuff no 0-day ≒ Java applications and applets appear to be popular again ≒ Reversing Java applications can be difficult ≒ Tips for reversing Java in less time (in my experience in any case) SensePost - 2010
- 4. The JAR File ≒ Java ARchive ≒ Used to distribute Java applications / applets etc. ≒ ZIP file containing compiled classes, libraries, settings, certificates, * ≒ Trivial to extract ≒ Normally disclose a vast amount of information SensePost - 2010
- 5. Attacking Java is fun ≒ Trivial to reverse engineer ≒ Compiled applications are vulnerable to virtually all attacks traditional web apps are vulnerable to ≒ but all wrapped up in increased sense of developer smugness ≒ Repurposed Java applications make *awesome* attack tools SensePost - 2010
- 6. Difficulties Attacking Java ≒ Many classes and libraries in JAR files of complex applications ≒ Class files often do not decompile cleanly ≒ Impossible to fix all java sources in large application ≒ Applets and applications are frequently signed ≒ Obfuscated Code ≒ Frequently have to rely on other tools too SensePost - 2010
- 7. ≒ Certificate information stored in META-INF ≒ MANIFEST.MF contains hashes for resources ≒ These files can easily be deleted Defeating Signing SensePost - 2010
- 8. ≒ Now possible to modify classes in JAR file ≒ Signing normally used specifically for Java applets Allow applets to access network resources Allow applets to read / write files ≒ However, the applet runs on *my* machine Can specify own security model What this Means SensePost - 2010
- 9. Obfuscation ≒ Defeating Java obfuscation is difficult ≒ Depends on the obfuscation mechanism used ≒ In most cases, virtually impossible ≒ however, the newer attack methodologies outlined later will help but wait there is more SensePost - 2010
- 10. Obfuscation ≒ A bunch of classes depending on reflection methods and serialized objects can not normally be obfuscated ≒ in obfuscated applications this provides us with a nice area to attack SensePost - 2010
- 11. Java Quick Kills ≒ Not necessary to fix all compiler errors ≒ Only need to fix specific classes with functionality you need Sanitisation libraries Network Stream libraries ≒ Updated classes can be recompiled with the original JAR file to satisfy dependancies SensePost - 2010
- 12. Demo and Walkthrough SensePost - 2010 ≒ Decompile Application and export sources
- 13. Demo and Walkthrough SensePost - 2010 ≒ Identify key source files and include in project
- 14. Demo and Walkthrough SensePost - 2010 ≒ Remove compiled class files from original JAR ≒ Rebuild JAR file
- 15. Demo and Walkthrough SensePost - 2010 ≒ Link modified JAR file to compiler CLASSPATH
- 16. Demo and Walkthrough SensePost - 2010 ≒ Modify source code and run
- 17. Demo and Walkthrough SensePost - 2010 ≒ Repurposing uses the same technique ≒ but changes the functionality in order to turn the application into an attack tool
- 18. Newer Attack Methods ≒ New research and toolsets make reversing and recompiling unneccessary ≒ Also make it easier to attack obfuscated applications ≒ Cannot always be used for repurposing SensePost - 2010
- 19. BlackHat Europe 2010 ≒ Manish Saindane Demonstrated attacks against serialized objects Provided Burp plug-in to view and modify serialized objects http://www.blackhat.com/html/bh-eu-10/bh-eu-10-archives.html SensePost - 2010
- 20. Demo Serialized Objects SensePost - 2010
- 21. BlackHat Las Vegas 2010 ≒ Arshan Dabirsiaghi JavaSnoop : How to Hack Anything Written in Java ≒ Stephen de Vries Hacking Java Clients ≒ Both talks outlined new methods for attacking Java Applications http://www.blackhat.com/html/bh-us-10/bh-us-10-archives.html SensePost - 2010
- 22. Demo JavaSnoop SensePost - 2010
- 23. In Summary ≒ Java reversing is fun ≒ Java reversing can be easy ≒ Newer attack methodologies no longer require attackers to reverse the application ≒ Traditional reversing techniques still normally apply for repurposing applications SensePost - 2010
- 24. Ta Muchly ≒ ZaCon folkses SensePost - 2010