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Kenobi

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Scanning

sudo nmap -sS -A -T4 10.10.184.162 -oN initialscan.nmap

Starting Nmap 7.60 ( https://nmap.org ) at 2023-03-26 05:54 BST
Nmap scan report for ip-10-10-184-162.eu-west-1.compute.internal (10.10.184.162)
Host is up (0.00064s latency).
Not shown: 993 closed ports
PORT     STATE SERVICE     VERSION
21/tcp   open  ftp         ProFTPD 1.3.5
22/tcp   open  ssh         OpenSSH 7.2p2 Ubuntu 4ubuntu2.7 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 b3:ad:83:41:49:e9:5d:16:8d:3b:0f:05:7b:e2:c0:ae (RSA)
|   256 f8:27:7d:64:29:97:e6:f8:65:54:65:22:f7:c8:1d:8a (ECDSA)
|_  256 5a:06:ed:eb:b6:56:7e:4c:01:dd:ea:bc:ba:fa:33:79 (EdDSA)
80/tcp   open  http        Apache httpd 2.4.18 ((Ubuntu))
| http-robots.txt: 1 disallowed entry 
|_/admin.html
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Site doesn't have a title (text/html).
111/tcp  open  rpcbind     2-4 (RPC #100000)
| rpcinfo: 
|   program version   port/proto  service
|   100000  2,3,4        111/tcp  rpcbind
|   100000  2,3,4        111/udp  rpcbind
|   100003  2,3,4       2049/tcp  nfs
|   100003  2,3,4       2049/udp  nfs
|   100005  1,2,3      47705/tcp  mountd
|   100005  1,2,3      48332/udp  mountd
|   100021  1,3,4      39455/tcp  nlockmgr
|   100021  1,3,4      54592/udp  nlockmgr
|   100227  2,3         2049/tcp  nfs_acl
|_  100227  2,3         2049/udp  nfs_acl
139/tcp  open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp  open  netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
2049/tcp open  nfs_acl     2-3 (RPC #100227)
MAC Address: 02:EE:F3:F5:03:59 (Unknown)
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.60%E=4%D=3/26%OT=21%CT=1%CU=33751%PV=Y%DS=1%DC=D%G=Y%M=02EEF3%T
OS:M=641FD021%P=x86_64-pc-linux-gnu)SEQ(SP=FB%GCD=1%ISR=FB%TI=Z%CI=I%TS=8)S
OS:EQ(SP=FB%GCD=1%ISR=FB%TI=Z%CI=I%II=I%TS=8)SEQ(SP=FB%GCD=1%ISR=FB%TI=Z%TS
OS:=8)OPS(O1=M2301ST11NW7%O2=M2301ST11NW7%O3=M2301NNT11NW7%O4=M2301ST11NW7%
OS:O5=M2301ST11NW7%O6=M2301ST11)WIN(W1=68DF%W2=68DF%W3=68DF%W4=68DF%W5=68DF
OS:%W6=68DF)ECN(R=Y%DF=Y%T=40%W=6903%O=M2301NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40
OS:%S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=
OS:%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%
OS:W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=
OS:)U1(R=Y%DF=N%T=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%
OS:DFI=N%T=40%CD=S)

Network Distance: 1 hop
Service Info: Host: KENOBI; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_nbstat: NetBIOS name: KENOBI, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
|   Computer name: kenobi
|   NetBIOS computer name: KENOBI\x00
|   Domain name: \x00
|   FQDN: kenobi
|_  System time: 2023-03-25T23:54:52-05:00
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   2.02: 
|_    Message signing enabled but not required
| smb2-time: 
|   date: 2023-03-26 05:54:52
|_  start_date: 1600-12-31 23:58:45

TRACEROUTE
HOP RTT     ADDRESS
1   0.64 ms ip-10-10-184-162.eu-west-1.compute.internal (10.10.184.162)

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 32.85 seconds
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Ports open

7

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Enmerate SMB Shares

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Nmap smb enumeration scripts

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Connect with smbclient to the share

A file is present log.txt. Used the get command to download it.

log.txt contain important information about ftp and NFS

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ssh key location

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Anonymous ftp login allowed

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Using the nmap command above, how many shares have been found?

3

Once you're connected, list the files on the share. What is the file can you see?

log.txt

What port is FTP running on?

21

What mount can we see?

/var

Enumerate RPC Bind

We have /var directory as mount

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Gain initial access with ProFtpd

search for exploits for proFtpd 1.3.5

The vulnerable Proftpd 1.3.5 version allows copying of files unauthenticated. copy the ssh key we found earlier to var folder.

The mod_copy module implements SITE CPFR and SITE CPTO commands, which can be used to copy files/directories from one place to another on the server. Any unauthenticated client can leverage these commands to copy files from any part of the filesystem to a chosen destination.

Now we can mount the /var folder on our machine and get the private key

copy the key to current folder and use that to access the machine

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Lets get the version of ProFtpd. Use netcat to connect to the machine on the FTP port.

What is the version?

1.3.5

How many exploits are there for the ProFTPd running?

4

What is Kenobi's user flag (/home/kenobi/user.txt)?

d0b0f3f53b6caa532a83915e19224899

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Priv Escalation

check for SUID binaries

we found a suspicious binary

checking the strings, we get to know that the binaries are being called without full path

copy the shell to the current directory and rename it to curl, add permissions to it and add it to PATH

Now run menu and select the option and we will get the root shell. using curl did not work for me

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What file looks particularly out of the ordinary?

/usr/bin/menu

Run the binary, how many options appear?

3

What is the root flag (/root/root.txt)?

177b3cd8562289f37382721c28381f02

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Gaining direct shell

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