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UNIRAS Brief - 265/04 - 3Com OfficeConnect Remote 812 ADSL Router Authentication Bypass Vulnerability

   UNIRAS (UK Govt CERT) Briefing Notice - 265/04 dated 03.06.04  Time: 13:50  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk


3Com OfficeConnect Remote 812 ADSL Router Authentication Bypass Vulnerability


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 (http://cve.mitre.org), 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 http://www.idefense.com/poi/teams/vcp.jsp


Copyright (c) 2004 iDEFENSE, Inc.

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<End of UNIRAS Briefing>