[Full-Disclosure] iDEFENSE Security Advisory 05.26.04: 3Com OfficeConnect Remote 812 ADSL Router Telnet Protocol Denial of Service Vulnerability

idlabs-advisories_at_idefense.com
Date: 05/26/04

  • Next message: Kurt Lieber: "[ GLSA 200405-21 ] Midnight Commander: Multiple vulnerabilities"
    To: <idlabs-advisories@idefense.com>
    Date: Wed, 26 May 2004 12:01:03 -0400
    
    

    iDEFENSE Security Advisory 05.26.04
    www.idefense.com/application/poi/display?id=105&type=vulnerabilities
    May 26, 2004

    I. BACKGROUND

    The 3Com OfficeConnect Remote 812 ADSL Router is a standalone
    bridge/router, with interfaces to a Local Area Network and an ADSL
    interface to a Wide Area Network.

    II. DESCRIPTION

    Remote exploitation of a buffer overflow in firmware release 1.1.9.4 of
    3Com's OfficeConnect Remote 812 ADSL Router could allow a denial of
    service.

    By sending a specially formed long string to the telnet port of a
    vulnerable device containing Telnet escape sequences, it is possible to
    get it to either reboot or stop handling packets. If the device does not
    reboot spontaneously, it will require a manual reboot before continuing
    normal operation.

    III. ANALYSIS

    Successful exploitation allows an attacker to stop the device from
    responding thereby preventing legitimate users from accessing the
    internet.

    More information about the 3Com OfficeConnect Remote 812 ADSL Router is
    available at
    http://www.3com.com/products/en_US/detail.jsp?tab=support&pathtype=suppo
    rt&sku=3CP4144.

    IV. DETECTION

    3Com OfficeConnect Remote 812 ADSL Router with the last firmware patch
    available has been confirmed vulnerable.

    V. WORKAROUNDS

    A previously given workaround for other issues with the http interface
    is available at the link shown. This shows how to configure the router
    to prevent external access to the http port. By changing occurences of
    port 80 into port 23, this method should also work for the telnet port.

    http://support.3com.com/infodeli/tools/remote/ocradsl/http_filtering.pdf

    VI. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2004-0476 to this issue. This is a candidate for inclusion in
    the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    VII. DISCLOSURE TIMELINE

    02/18/04 Exploit acquired by iDEFENSE
    03/08/04 iDEFENSE Clients notified
    03/11/04 Initial vendor notification - no response
    03/30/04 Secondary vendor notification - no response
    05/26/04 Public Disclosure

    VIII. CREDIT

    Rafel Ivgi is credited with this discovery.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    IX. LEGAL NOTICES

    Copyright (c) 2004 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert
    electronically. It may not be edited in any way without the express
    written consent of iDEFENSE. If you wish to reprint the whole or any
    part of this alert in any other medium other than electronically, please
    email customerservice@idefense.com for permission.

    Disclaimer: The information in the advisory is believed to be accurate
    at the time of publishing based on currently available information. Use
    of the information constitutes acceptance for use in an AS IS condition.
    There are no warranties with regard to this information. Neither the
    author nor the publisher accepts any liability for any direct, indirect,
    or consequential loss or damage arising from use of, or reliance on,
    this information.

    _______________________________________________
    Full-Disclosure - We believe in it.
    Charter: http://lists.netsys.com/full-disclosure-charter.html


  • Next message: Kurt Lieber: "[ GLSA 200405-21 ] Midnight Commander: Multiple vulnerabilities"

    Relevant Pages