![[object Object],[object Object],[object Object],[object Object],# who am i # who am i 16:08 up 4:26, 1 user, load averages: 0.28 0.40 0.33 USER TTY FROM LOGIN@ IDLE WHAT saumil console - 11:43 0:05 bash](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Writing Metasploit Plugins
- 1. More on Metasploit plugins from vulnerability to exploit Saumil Shah ceo, net-square IT Underground - Prague 2007
- 3. From Vulnerability to Exploit Fuzzing EIP = 0x41414141 Debugger Attack Vector Reliable EIP return address Bad characters Test Shellcode (INT 3) INT 3? Final Shellcode Working exploit Shellcode Handling
- 5. The Process Memory Map environment vars cmd line arguments **envp **argv argc main() local vars … v heap ^ stack … heap - malloc’ed data .bss .data .text 0xc0000000 0x08000000
- 6. Win32 Process Memory Map No access Shared user page PEB First TEB DLLs DLLs DLLs heap program image error trapping 0x7FFFFFFF 0x00000000 0x00010000 stack 0x7FFE1000 0x7FFE0000 0x7FFDF000 0x7FFDE000 0x40000000
- 10. Exception handling … implementation params saved EIP saved EBP Bottom of stack more frames frame w/ exception handling local vars addr of exception handler exception handler code (catch block)
- 13. SEH on the stack address of exception handler 0xFFFFFFFF main() ^ stack func_z() initial entry frame MSVCRT!exhandler address of exception handler ptr to next SEH record ex_handler_z() params saved EBP saved EIP local vars
- 15. Overwriting SEH address of exception handler ptr to next SEH record ex_handler() params saved EBP saved EIP buffer
- 16. Overwriting SEH AAAA AAAA AAAA : : : AAAA AAAA ex_handler() AAAA AAAA AAAA AAAA AAAA Illegal memory access causes segmentation fault. OS invokes registered exception handler in the chain EIP = 0x42424242 AAAA
- 25. Heap Spraying NOP sled shellcode NOP sled shellcode NOP sled shellcode <script> : spray = build_large_nopsled(); a = new Array(); for(i = 0; i < 100; i++) a[i] = spray + shellcode; : </script> <html> : exploit trigger condition goes here : </html> a[7] a[8] a[9]
- 43. How Metasploit runs an exploit List of known target values user supplied exploit info Metasploit Shellcode Library Encoders Payload handlers create payload launch attack get connection EXPLOIT preamble
- 45. Structure of the exploit perl module package Msf::Exploit::name; use base “Msf::Exploit”; use strict; use Pex::Text; my $advanced = { }; my $info = { }; sub new { } sub Exploit { } information block constructor return an instance of our exploit exploit block
- 58. Thank You! Saumil Shah [email_address] http://net-square.com +91 98254 31192