mirror of
https://github.com/AbdullahRizwan101/CTF-Writeups
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104 lines
5.9 KiB
Markdown
104 lines
5.9 KiB
Markdown
# TryHackMe-Anonymous
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## NMAP
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```
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Nmap scan report for 10.10.126.173
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Host is up (0.41s latency).
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Not shown: 996 closed ports
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PORT STATE SERVICE VERSION
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21/tcp open ftp vsftpd 2.0.8 or later
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| ftp-anon: Anonymous FTP login allowed (FTP code 230)
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|_drwxrwxrwx 2 111 113 4096 Jun 04 2020 scripts [NSE: writeable]
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| ftp-syst:
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| STAT:
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| FTP server status:
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| Connected to ::ffff:10.2.54.209
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| Logged in as ftp
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| TYPE: ASCII
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| No session bandwidth limit
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| Session timeout in seconds is 300
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| Control connection is plain text
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| Data connections will be plain text
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| At session startup, client count was 4
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| vsFTPd 3.0.3 - secure, fast, stable
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|_End of status
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22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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| 2048 8b:ca:21:62:1c:2b:23:fa:6b:c6:1f:a8:13:fe:1c:68 (RSA)
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| 256 95:89:a4:12:e2:e6:ab:90:5d:45:19:ff:41:5f:74:ce (ECDSA)
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|_ 256 e1:2a:96:a4:ea:8f:68:8f:cc:74:b8:f0:28:72:70:cd (ED25519)
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139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
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445/tcp open netbios-ssn Samba smbd 4.7.6-Ubuntu (workgroup: WORKGROUP)
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Service Info: Host: ANONYMOUS; OS: Linux; CPE: cpe:/o:linux:linux_kernel
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Host script results:
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|_clock-skew: mean: 0s, deviation: 1s, median: -1s
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|_nbstat: NetBIOS name: ANONYMOUS, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
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| smb-os-discovery:
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| OS: Windows 6.1 (Samba 4.7.6-Ubuntu)
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| Computer name: anonymous
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| NetBIOS computer name: ANONYMOUS\x00
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| Domain name: \x00
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| FQDN: anonymous
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|_ System time: 2020-12-11T21:44:31+00:00
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| smb-security-mode:
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| account_used: guest
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| authentication_level: user
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| challenge_response: supported
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|_ message_signing: disabled (dangerous, but default)
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| smb2-security-mode:
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| 2.02:
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|_ Message signing enabled but not required
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| smb2-time:
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| date: 2020-12-11T21:44:31
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|_ start_date: N/A
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Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
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Nmap done: 1 IP address (1 host up) scanned in 54.45 seconds s
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```
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From the nmap scan we can anonymously login into ftp since it's enabled
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## FTP (PORT 21)
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<img src="https://imgur.com/lgkDur4.png"/>
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<img src="https://imgur.com/orbnWlZ.png"/>
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These are the files that we see on the ftp server
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<img src="https://imgur.com/Vc3APQQ.png"/>
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There wasn't anything on the ftp server so just a Rabbit Hole...but there is another port open which is `SMB` on port 445 and by running `smbmap` to check if `anonymous` user read any share
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<img src="https://imgur.com/Rwq5D7A.png"/>
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So it looks like we can read share `pics` on the box , now we are going to use `smbclient` to access that share
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<img src="https://imgur.com/v2TfQwl.png"/>
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We only have two image files `.jpg` and `.jpeg`
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<img src="https://imgur.com/nw9vyJk.png"/>
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And through `strings` and `steghide` I couldn't find anything, But then I thought about that ftp server and went back and it had all permissions setup means that we can write files on it so I edited the `clean.sh` and put a bash reverse sehll in it
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<img src="https://imgur.com/XUoA7M5.png"/>
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Then putted it on the ftp server and I saw that `removed_files.log` is modified so when downloaded it to see what changes happened it I got a reverse shell on my netcat
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Now I ran a find command to look for SUID's
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<img src="https://imgur.com/QTu3Vtv.png"/>
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<img src="https://imgur.com/rJpXRGd.png"/>
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Here I found that `env` has a SUID so I visited `GTFOBIN` to see I can become root with it
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<img src="https://imgur.com/zR9e4PF.png"/>
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So we can become root , let's put this into practice
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<img src="https://imgur.com/H72GLZQ.png"/>
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This could have also been done with `lxd` but for that you have to make image , transfer to target then run 4-5 commands and I was lazy to do that so we got root that's the only thing that matters ( :
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