V-SOL GPON/EPON OLT Platform 2.03 - Unauthenticated Configuration Download

# Title: V-SOL GPON/EPON OLT Platform 2.03 - Unauthenticated Configuration Download
# Date: 2019-09-27
# Author: LiquidWorm
# Vendor: Guangzhou V-SOLUTION Electronic Technology Co., Ltd.
# Product web page: https://www.vsolcn.com
# Affected version: V2.03.62R_IPv6
# V2.03.54R
# V2.03.52R
# V2.03.49
# V2.03.47
# V2.03.40
# V2.03.26
# V2.03.24
# V1.8.6
# V1.4

Summary: GPON is currently the leading FTTH standard in broadband access
technology being widely deployed by service providers around the world.
GPON/EPON OLT products are 1U height 19 inch rack mount products. The
features of the OLT are small, convenient, flexible, easy to deploy, high
performance. It is appropriate to be deployed in compact room environment.
The OLTs can be used for 'Triple-Play', VPN, IP Camera, Enterprise LAN and
ICT applications.

Desc: The device OLT Web Management Interface is vulnerable to unauthenticated
configuration download and information disclosure vulnerability when direct
object reference is made to the usrcfg.conf file using an HTTP GET method. This
will enable the attacker to disclose sensitive information and help her in
authentication bypass, privilege escalation and/or full system access.

Tested on: GoAhead-Webs


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2019-5534
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5534.php

25.09.2019

--
# PoC

1# curl http://192.168.8.200/device/usrcfg.conf
2# curl http://192.168.8.201/action/usrcfg.conf