Public Vulnerability Reports

3Com OfficeConnect Remote 812 ADSL Router Authentication Bypass Vulnerability



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.


02/18/2004   Exploit acquired by iDEFENSE
03/08/2004   iDEFENSE Clients notified
03/11/2004   Initial vendor notification - no response
03/30/2004   Secondary vendor notification - no response
05/27/2004   Public Disclosure


Rafel Ivgi is credited with this discovery.

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Copyright © 2004 Verisign, Inc.

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