full-disclosure - Re: Netgear DG632 Router Remote DoS Vulnerability

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Date: Mon, 15 Jun 2009 23:45:58 +0200
From: Alaa El yazghi <m.elyazghi@...il.com>
To: Tom Neaves <tom@...neaves.co.uk>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: Netgear DG632 Router Remote DoS Vulnerability

How can it be carried out remotely if it bugs localy?

2009/6/15 Tom Neaves <tom@...neaves.co.uk>

> Product Name: Netgear DG632 Router
> Vendor: http://www.netgear.com
> Date: 15 June, 2009
> Author: tom@...neaves.co.uk <tom@...neaves.co.uk>
> Original URL: http://www.tomneaves.co.uk/Netgear_DG632_Remote_DoS.txt
> Discovered: 18 November, 2006
> Disclosed: 15 June, 2009
>
> I. DESCRIPTION
>
> The Netgear DG632 router has a web interface which runs on port 80.  This
> allows an admin to login and administer the device's settings.  However,
> a Denial of Service (DoS) vulnerability exists that causes the web
> interface
> to crash and stop responding to further requests.
>
> II. DETAILS
>
> Within the "/cgi-bin/" directory of the administrative web interface exists
> a
> file called "firmwarecfg".  This file is used for firmware upgrades.  A
> HTTP POST
> request for this file causes the web server to hang.  The web server will
> stop
> responding to requests and the administrative interface will become
> inaccessible
> until the router is physically restarted.
>
> While the router will still continue to function at the network level, i.e.
> it will
> still respond to ICMP echo requests and issue leases via DHCP, an
> administrator will
> no longer be able to interact with the administrative web interface.
>
> This attack can be carried out internally within the network, or over the
> Internet
> if the administrator has enabled the "Remote Management" feature on the
> router.
>
> Affected Versions: Firmware V3.4.0_ap (others unknown)
>
> III. VENDOR RESPONSE
>
> 12 June, 2009 - Contacted vendor.
> 15 June, 2009 - Vendor responded.  Stated the DG632 is an end of life
> product and is no
> longer supported in a production and development sense, as such, there will
> be no further
> firmware releases to resolve this issue.
>
> IV. CREDIT
>
> Discovered by Tom Neaves
>

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