Hackfest 2016 Orcus Walkthrough

This is a write up for Hackfest 2016 Orcus found in Vulnhub, just to fill my leisure time!
Download here Hackfest 2016 Orcus

Nmap

 

[email protected]:~# nmap -sC -sV -p- 192.168.1.108

Starting Nmap 7.25BETA1 ( https://nmap.org ) at 2017-03-25 20:41 WIB
Nmap scan report for 192.168.1.108
Host is up (0.00028s latency).
Not shown: 65519 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.1 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 3a:48:6e:8e:3f:32:26:f8:b6:a1:c6:b1:70:73:37:75 (RSA)
|_ 256 04:55:e6:48:50:d6:93:d7:12:80:a0:68:bc:97:fa:33 (ECDSA)
53/tcp open domain ISC BIND 9.10.3-P4-Ubuntu
| dns-nsid:
|_ bind.version: 9.10.3-P4-Ubuntu
80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
| http-robots.txt: 30 disallowed entries (15 shown)
| /exponent.js.php /exponent.js2.php /exponent.php
| /exponent_bootstrap.php /exponent_constants.php /exponent_php_setup.php
| /exponent_version.php /getswversion.php /login.php /overrides.php
| /popup.php /selector.php /site_rss.php /source_selector.php
|_/thumb.php
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Site doesn't have a title (text/html).
110/tcp open pop3 Dovecot pop3d
|_pop3-capabilities: TOP STLS RESP-CODES PIPELINING SASL AUTH-RESP-CODE CAPA UIDL
| ssl-cert: Subject: commonName=localhost/organizationName=Dovecot mail server
| Not valid before: 2016-10-09T03:44:10
|_Not valid after: 2026-10-09T03:44:10
|_ssl-date: TLS randomness does not represent time
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 2,3,4 2049/tcp nfs
| 100003 2,3,4 2049/udp nfs
| 100005 1,2,3 34286/udp mountd
| 100005 1,2,3 57208/tcp mountd
| 100021 1,3,4 40200/tcp nlockmgr
| 100021 1,3,4 43588/udp nlockmgr
| 100227 2,3 2049/tcp nfs_acl
|_ 100227 2,3 2049/udp nfs_acl
139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
143/tcp open imap Dovecot imapd
|_imap-capabilities: SASL-IR more ID have post-login LITERAL+ IDLE listed IMAP4rev1 ENABLE LOGINDISABLEDA0001 Pre-login STARTTLS LOGIN-REFERRALS OK capabilities
| ssl-cert: Subject: commonName=localhost/organizationName=Dovecot mail server
| Not valid before: 2016-10-09T03:44:10
|_Not valid after: 2026-10-09T03:44:10
|_ssl-date: TLS randomness does not represent time
443/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.1 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 3a:48:6e:8e:3f:32:26:f8:b6:a1:c6:b1:70:73:37:75 (RSA)
|_ 256 04:55:e6:48:50:d6:93:d7:12:80:a0:68:bc:97:fa:33 (ECDSA)
445/tcp open netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
993/tcp open ssl/imap Dovecot imapd
|_imap-capabilities: SASL-IR ID more listed LITERAL+ IDLE AUTH=PLAINA0001 IMAP4rev1 post-login have ENABLE Pre-login LOGIN-REFERRALS OK capabilities
|_ssl-date: TLS randomness does not represent time
995/tcp open ssl/pop3 Dovecot pop3d
|_pop3-capabilities: TOP SASL(PLAIN) RESP-CODES PIPELINING USER AUTH-RESP-CODE CAPA UIDL
|_ssl-date: TLS randomness does not represent time
2049/tcp open nfs_acl 2-3 (RPC #100227)
37442/tcp open mountd 1-3 (RPC #100005)
40200/tcp open nlockmgr 1-4 (RPC #100021)
52958/tcp open mountd 1-3 (RPC #100005)
57208/tcp open mountd 1-3 (RPC #100005)
MAC Address: 00:0C:29:D4:8C:09 (VMware)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_nbstat: NetBIOS name: DHCPPC8, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| smb-os-discovery:
| OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
| Computer name:
| NetBIOS computer name: ORCUS
| Workgroup: WORKGROUP
|_ System time: 2017-03-25T09:42:04-04:00
| smb-security-mode:
| account_used: guest
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
|_smbv2-enabled: Server supports SMBv2 protocol

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 62.23 seconds

 

Scanning the web with nikto

[email protected]:~# nikto -h 192.168.1.108
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP: 192.168.1.108
+ Target Hostname: 192.168.1.108
+ Target Port: 80
+ Start Time: 2017-03-25 20:45:15 (GMT7)
---------------------------------------------------------------------------
+ Server: Apache/2.4.18 (Ubuntu)
+ Server leaks inodes via ETags, header found with file /, fields: 0x65 0x53ff6086e56aa
+ The anti-clickjacking X-Frame-Options header is not present.
+ The X-XSS-Protection header is not defined. This header can hint to the user agent to protect against some forms of XSS
+ The X-Content-Type-Options header is not set. This could allow the user agent to render the content of the site in a different fashion to the MIME type
+ Cookie PHPSESSID created without the httponly flag
+ No CGI Directories found (use '-C all' to force check all possible dirs)
+ Entry '/exponent.js.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/exponent.js2.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/exponent.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/exponent_bootstrap.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/exponent_constants.php' in robots.txt returned a non-forbidden or redirect HTTP code (500)
+ Entry '/exponent_php_setup.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/exponent_version.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/getswversion.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/login.php' in robots.txt returned a non-forbidden or redirect HTTP code (302)
+ Entry '/overrides.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/selector.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/site_rss.php' in robots.txt returned a non-forbidden or redirect HTTP code (302)
+ Entry '/source_selector.php' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/thumb.php' in robots.txt returned a non-forbidden or redirect HTTP code (302)
+ Entry '/ABOUT.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/CHANGELOG.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/CREDITS.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/INSTALLATION.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/README.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/RELEASE.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ Entry '/TODO.md' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ OSVDB-3268: /files/: Directory indexing found.
+ Entry '/files/' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ OSVDB-3268: /tmp/: Directory indexing found.
+ Entry '/tmp/' in robots.txt returned a non-forbidden or redirect HTTP code (200)
+ "robots.txt" contains 30 entries which should be manually viewed.
+ Multiple index files found: /index.php, /index.html
+ Allowed HTTP Methods: GET, HEAD, POST, OPTIONS
+ OSVDB-2870: /index.php?download=/etc/passwd: Snif 1.2.4 allows any file to be retrieved from the web server.
+ OSVDB-59085: /index.php?|=../../../../../../../../../etc/passwd: Portix-PHP Portal allows retrieval of arbitrary files via the '..' type filtering problem.
+ /index.php?page=../../../../../../../../../../etc/passwd: The PHP-Nuke Rocket add-in is vulnerable to file traversal, allowing an attacker to view any file on the host. (probably Rocket, but could be any index.php)
+ OSVDB-59085: /index.php?l=forum/view.php&topic=../../../../../../../../../etc/passwd: Portix-PHP Portal allows retrieval of arbitrary files via the '..' type filtering problem.
+ OSVDB-8193: /index.php?module=ew_filemanager&type=admin&func=manager&pathext=../../../etc/&view=passwd: EW FileManager for PostNuke allows arbitrary file retrieval.
+ OSVDB-3092: /admin/: This might be interesting...
+ OSVDB-3092: /files/: This might be interesting...
+ Uncommon header 'x-ob_mode' found, with contents: 1
+ OSVDB-3092: /tmp/: This might be interesting...
+ OSVDB-3092: : This might be interesting... possibly a system shell found.
+ OSVDB-3093: /admin/index.php: This might be interesting... has been seen in web logs from an unknown scanner.
+ OSVDB-3092: /xmlrpc.php: xmlrpc.php was found.
+ OSVDB-3233: /icons/README: Apache default file found.
+ OSVDB-3092: /test.php: This might be interesting...
+ /phpmyadmin/: phpMyAdmin directory found
+ 9338 requests: 0 error(s) and 48 item(s) reported on remote host
+ End Time: 2017-03-25 20:45:39 (GMT7) (24 seconds)

OK first I’m interested with admin directory, let’s check it out!


Hmm.. just like that, try to check backups directory

I try to download this file “SimplePHPQuiz-Backupz.tar.gz” for find some information..

Yupp I found user and password for database here.
Login into phpmyadmin, the first step I try to upload file into root apache directory but not successfull because this mysql use the newest version, which is in the newest mysql version running with the –secure-file-priv

From mysql, it said that I can only write to the directory /var/lib/mysql-files/

OK trying to find another way..
Check all database, and there is zenphoto database here but still empty.
Let’s check zenphoto directory

Just try to install this zenphoto cms, set user and password database with “dbuser:dbpassword”
Then we can login into admin page zenphoto, so let’s take advantage with this way
First, we can enable elfinder plugins for trying upload backdoor into zenphoto.

Success!! Reverse shell now!

 Privilege Escalation

Day to day I have no idea for privilege escalation, and finaly I remember another lab with misconfiguration in nfs.
First, check with showmount.

Nice!! we can mount this folder into my machine.

Second, I try to create linux setuid setgid with c and compile!

Third, execute this “shell” and get root 😀

Thanks to Vulnhub and @ViperBlackSkull !

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