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



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   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)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
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3Com OfficeConnect Remote 812 ADSL Router Authentication Bypass Vulnerability


Detail
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iDEFENSE Security Advisory 05.27.04 
www.idefense.com/application/poi/display?id=106&type=vulnerabilities
May 27, 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 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.

III. ANALYSIS

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 
http://www.3com.com/products/en_US/detail.jsp?tab=support&pathtype=suppo
rt&sku=3CP4144.

IV. DETECTION

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

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-2004-0477 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
05/27/04  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@xxxxxxxxxxxx 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



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UNIRAS wishes to acknowledge the contributions of iDefense for the information 
contained in this Briefing. 
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<End of UNIRAS Briefing>