Persistence and Cleanup
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This document discusses penetration testing persistence and clean up. It defines persistence as getting back into a system without repeating the entire access process, even if the system is patched or reboots. Good persistence techniques include leaving an executable to run at startup, on intervals, or after a task, or setting a timer. Bad techniques are backdoors, open connections when not in use, and excessive data transfers. Ugly but effective ways are adding users or injecting into processes long-term. Metasploit and adding start-up executables or services are discussed for persistence. Clean up removes traces of access by modifying rather than deleting logs, and removing scripts or persistence artifacts. Windows and Linux clean up steps are also outlined.
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The document summarizes how to exploit a heap-based buffer overflow vulnerability in the Protostar Heap 3 challenge. It describes using the Doug Lea malloc implementation, modifying chunk size metadata to change program execution, overwriting pointers to hijack control flow, and crafting 12-byte shellcode to jump to a "winner()" function and complete the exploit.
Heap Base Exploitation
We introduce the fundamentals of dynamic memory allocation and highlight several exploitable properties. These ideas are put into practice in a set of heap overflow challenges from exploit-exercise.com's Protostar VM. We walk through the first three. Other uses of heap space such as heap spraying are mentioned.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Persistence and Cleanup
- 1. Penetration Testing: Persistence and Clean up November 1st 2017
- 2. What is Persistence 1. Getting back into the system without going through the entire process again 2. Leaving a way to get back in even if the system is patched 3. Getting back in after the system reboots 4. Not being seen on the box
- 3. Good ways to leave persistence 1. Leaving an executable that will… a. Run when the system starts b. Execute in intervals calling back to handler c. Run when a certain task is done d. Set a timer to run only after x minutes of system boot
- 4. Bad ways to leave persistence 1. Backdoors 2. Leaving connections open when not in use 3. Sending a lot of data back to your handler
- 5. Ugly but effective ways of leaving persistence 1. Adding users 2. Injecting into processes for long periods of time
- 8. Startup Executable Adding executable to Windows startup: C:Users<user name>AppDataRoamingMicrosoftWindowsStart MenuProgramsStartup Adding services in linux: ../init.d/malicious.service - systemctl enable malicious.service
- 9. What is Clean up 1. Removing any trace you were there 2. Modifying not deleting log files 3. Removing scripts that you left laying around 4. Removing persistence
- 10. Windows Clean up
- 11. Linux Clean up /var/log/messages Remove bash history ~./bash_history Any trace you were there in /var/log/