[NEWS] Backdoor Menu on Conexant Chipset Dsl Router (Zoom X3)
From: SecuriTeam (support_at_securiteam.com)
Date: 07/08/04
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To: list@securiteam.com Date: 8 Jul 2004 15:07:37 +0200
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Backdoor Menu on Conexant Chipset Dsl Router (Zoom X3)
------------------------------------------------------------------------
SUMMARY
<http://www.zoom.com/products/adsl_overview.html> Zoom ADSL modems
"provide superior data rate transmission and extended reach, even over
challenging line conditions". A vulnerability in the product leaves out an
administrative port that is password protected by a default password (this
default password cannot be changed).
DETAILS
Vulnerable Systems:
* Zoom X3
Telneting to port 254 gives you access to a menu, which identifies itself
as "ATU-R ACCESS RUNNER ADSL TERMINAL (Annex A) 3.27", and uses the
DEFAULT HTML management password, zoomadsl, even if you have changed it to
something else. i.e. changing the HTML password does not change this one.
From this menu you can change DSL settings and issue a complete "Factory
Reset".
Workaround:
The workaround is to create dummy "Virtual Servers" on port TCP 254 this
will block any incoming connections.
ADDITIONAL INFORMATION
The information has been provided by <mailto:adam@algroup.co.uk> Adam
Laurie.
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