[NEWS] Backdoor Menu on Conexant Chipset Dsl Router (Zoom X3)

From: SecuriTeam (support_at_securiteam.com)
Date: 07/08/04

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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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