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Category:   Device (Router/Bridge/Hub)  >   OfficeConnect Router (3Com) Vendors:   3Com
3Com OfficeConnect ADSL Router Authentication Can Be Bypassed By Remote Users
SecurityTracker Alert ID:  1010320
SecurityTracker URL:
CVE Reference:   CVE-2004-0477   (Links to External Site)
Date:  May 27 2004
Impact:   Root access via network, User access via network
Exploit Included:  Yes  

Description:   iDEFENSE reported a vulnerability in the 3Com OfficeConnect Remote 812 ADSL Router. A remote user can bypass the authentication process to gain access to the device.

It is reported that a remote user can connect to the router via HTTP and make a series of authentication attempts with an arbitrary username and password combination to gain administrative access to the device.

The vendor was reportedly notified on March 11, 2004 and March 30, 2004 without response.

The original advisory is available at:

Impact:   A remote user can gain administrative access to the router.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Authentication error

Message History:   None.

 Source Message Contents

Subject:  iDEFENSE Security Advisory 05.27.04: 3Com OfficeConnect Remote 812

3Com OfficeConnect Remote 812 ADSL Router Authentication Bypass

iDEFENSE Security Advisory 05.27.04
May 27, 2004


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.


Remote exploitation of an authentication bypass vulnerability in 3Com's
OfficeConnect Remote 812 ADSL Router could allow remote users to
arbitrarily manipulate network traffic.

By making multiple successive authorization attempts to connect to the
router, it is eventually possible to authenticate with any
username/password combination. While the root cause of the vulnerability
is not known, exploitation is trivial and does not require either a
known username or password.


Successful exploitation allows an attacker to perform any administrative
function that a legitimate administrator could perform.

More information about the 3Com OfficeConnect Remote 812 ADSL Router is
available at


iDEFENSE has confirmed that the 3Com OfficeConnect Remote 812 ADSL
Router with the last firmware patch is vulnerable


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.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2004-0477 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


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
05/27/04  Public Disclosure


Rafel Ivgi is credited with this discovery.

Get paid for vulnerability research


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 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.


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