Proving grounds Play: SunsetMidnight

- 2 mins
CTF Offsec labs OSCP Writeup Pg-Play Linux

NMAP

PORT     STATE SERVICE VERSION
22/tcp   open  ssh     OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
80/tcp   open  http    Apache httpd 2.4.38 ((Debian))
|_http-title: Did not follow redirect to http://sunset-midnight/
| http-robots.txt: 1 disallowed entry 
|_/wp-admin/
3306/tcp open  mysql   MySQL 5.5.5-10.3.22-MariaDB-0+deb10u1
| mysql-info: 
|   Protocol: 10
|   Version: 5.5.5-10.3.22-MariaDB-0+deb10u1

Fuzzing

Files

********************************************************
* Wfuzz 3.1.0 - The Web Fuzzer                         *
********************************************************

Target: http://sunset-midnight/FUZZ
Total requests: 37050

=====================================================================
ID           Response   Lines    Word       Chars       Payload                     
=====================================================================

000000005:   405        0 L      6 W        42 Ch       "xmlrpc.php"                
000000036:   200        87 L     300 W      4869 Ch     "wp-login.php"              
000000130:   200        97 L     823 W      7278 Ch     "readme.html"               
000000206:   200        384 L    3177 W     19915 Ch    "license.txt"               
000000248:   200        3 L      6 W        67 Ch       "robots.txt"                
000000263:   200        0 L      0 W        0 Ch        "wp-config.php"                            
000000413:   200        0 L      0 W        0 Ch        "wp-cron.php"                             
000000462:   200        11 L     24 W       228 Ch      "wp-links-opml.php"                           
000000838:   200        0 L      0 W        0 Ch        "wp-load.php"

Brute Forcing Mysql Credentials

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Logging into Mysql DB

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Get user credentials.

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Generate new password MD5 hash.

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Update user password.

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Sucessfuly logged into wordpress admin portal.

Uploading Reverse Shell in themes

Uploading revershell in the themes resulted in failure.

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Generate Malicious wordpress plugin

GitHub

The python code allows to create malicious reverse shell payload and write it to the zip file.

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Upload and install the malicious plugin

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Trigger reverse shell

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Shell obtained

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Post obtaining shell, hardcoded user credentials were found in the wordpress config files.

Found credentials for user jose

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SSH to user jose

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Privilege Escalation

SUIDs

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The status binary in the SUID runs services.

  • Create a service
  • Apply executable permission
  • Run /usr/bin/status binary

Service file contents

/bin/sh

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Root obtained

Thanks for reading!

For more insights and updates, follow me on Twitter: @thevillagehacker.

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Naveen J

Naveen J

Security Researcher | Appsec Specialist@SISA Information Security | Web 3 Security Enthusiast