3Com OfficeConnect 812 ADSL Router Can Be Crashed With Long Telnet String
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SecurityTracker Alert ID: 1010298
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SecurityTracker URL: http://securitytracker.com/id?1010298
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CVE Reference: CAN-2004-0476
(Links to External Site)
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Date: May 26 2004
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Impact: Denial of service via network
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Exploit Included: Yes
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Advisory: iDEFENSE
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Version(s): firmware 1.1.9.4
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Description: iDEFENSE reported a buffer overflow vulnerability in the 3Com OfficeConnect Remote 812 ADSL Router. A remote user can cause the router to crash.
It is reported that a remote user can send a specially crafted packet containing telnet escape sequences to the telnet port on the
target device to cause the device to reboot or to crash. If the device crashes, a manual restart is required, the report said.
The
vendor was reportedly notified on March 11, 2004 and March 30, 2004 without response.
The original advisory is available at:
http://www.idefense.com/application/poi
/display?id=105&type=vulnerabilities
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Impact: A remote user can cause the device to reboot or to crash.
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Solution: No solution was available at the time of this entry.
The report indicates that as a workaround, you may be able to configure the
router to prevent external access to the telnet port, as described (for the http port) in the following document:
http://support.3com.com/infodeli/tools/remote/ocradsl
/http_filtering.pdf
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Vendor URL: www.3com.com/ (Links to External Site)
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Cause: Boundary error
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Reported By: idlabs-advisories@idefense.com
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Message History:
None.
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Source Message Contents
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Date: Wed, 26 May 2004 12:01:03 -0400
From: idlabs-advisories@idefense.com
Subject: iDEFENSE Security Advisory 05.26.04: 3Com OfficeConnect Remote 812
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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.
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