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Sorcerer

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Gaining Access

Nmap scan:

$ nmap -p- --min-rate 4000 -Pn 192.168.168.100
Starting Nmap 7.93 ( https://nmap.org ) at 2023-07-10 13:52 +08
Nmap scan report for 192.168.168.100
Host is up (0.17s latency).
Not shown: 65526 closed tcp ports (conn-refused)
PORT      STATE SERVICE
22/tcp    open  ssh
80/tcp    open  http
111/tcp   open  rpcbind
2049/tcp  open  nfs
7742/tcp  open  msss
33603/tcp open  unknown
41637/tcp open  unknown
42193/tcp open  unknown
59253/tcp open  unknown

Did a detailed scan in case:

$ sudo nmap -p 80,111,2049,7742,33603,41637 -sC -sV --min-rate 5000 -Pn 192.168.168.100
Starting Nmap 7.93 ( https://nmap.org ) at 2023-07-10 13:55 +08
Nmap scan report for 192.168.168.100
Host is up (0.21s latency).

PORT      STATE SERVICE VERSION
80/tcp    open  http    nginx
|_http-title: Site doesn't have a title (text/html).
111/tcp   open  rpcbind 2-4 (RPC #100000)
| rpcinfo: 
|   program version    port/proto  service
|   100000  2,3,4        111/tcp   rpcbind
|   100000  2,3,4        111/udp   rpcbind
|   100003  3           2049/udp   nfs
|   100003  3,4         2049/tcp   nfs
|   100005  1,2,3      41637/tcp   mountd
|   100005  1,2,3      52180/udp   mountd
|   100021  1,3,4      42193/tcp   nlockmgr
|   100021  1,3,4      58389/udp   nlockmgr
|   100227  3           2049/tcp   nfs_acl
|_  100227  3           2049/udp   nfs_acl
2049/tcp  open  nfs_acl 3 (RPC #100227)
7742/tcp  open  http    nginx
|_http-title: SORCERER
33603/tcp open  mountd  1-3 (RPC #100005)
41637/tcp open  mountd  1-3 (RPC #100005)

NFS and Port 7742 look the most promising.

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NFS Enumeration -> Dead End

I first enumerated NFS to see if there was anything to mount:

There was nothing, so let's move on.

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Web Enumeration -> Zipfiles

Port 7742 just shows us a login page:

I ran a gobuster directory scan while I tested some weak default passwords. I found a few directories present:

The /zipfiles directory looks the most interesting. Within it, there were zip files named after the users on the machine:

max.zip was the largest and hence the only one I downloaded. When unzipped, it contained all the files like his SSH key:

However, attempts to SSH in as max fail.

It seems that something is blocking us. When we read the scp_wrapper.sh file, we see that ssh is being blocked, but not scp:

Since scp is allowed, we can transfer our public key into the authorized_keys folder:

Afterwards. we can just ssh in:

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Privilege Escalation

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SUID Binary -> Root Shell

I did a search for SUID binaries on the machine:

start-stop-daemon is an SUID binary, and it can spawn a root shell for us.

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