Re: ASUS RT-N13U Unsecured Telnet on LAN and WAN

[Craig Young <vuln-report () secur3 us>]

I received the same automated response when reporting a handful of
security flaws to Asus.  The following week, I submitted another
message to techsupport () asus com and received a relevant response
within 24 hours.

On a side note, I checked a different (slightly newer) Asus router
with the most recent firmware and it is not affected -- telnet starts
and stops as expected per the setting in the HTTP UI, the password
remains the same as the admin password, and telnet is not externally
accessible unless the firewall is disabled.

Best Regards,
Craig Young
@CraigTweets

On Tue, Oct 29, 2013 at 9:05 AM, Shelby Spencer <pwd_manager () hotmail com> wrote:
> It should be further noted, that setting a password for the telnet account
> via the /sbin/chpasswd.sh script is only valid until the next reboot when it
> gets wiped out.
>
> After alerting ASUS, I got the following non-reply.  They are not taking the
> problem seriously (they just closed out the ticket with a generic response):
>
> Thank you for contacting ASUS Customer Service.
> My name is Joe and it is my pleasure to help you with your problem.
>
> Thank you for contacting ASUS and providing your feedback. Your information
> has been documented. If you have further questions or concerns, please
> contact us at 812-282-2787 and we will be happy to help you.
>
> Welcome to refer Troubleshooting & FAQ for ASUS products in ASUS website:
> http://support.asus.com/servicehome.aspx?SLanguage=en
>
> If you continue to experience issues in the future, please do not hesitate
> to contact us.
>
> An email survey will be sent to you within the next 5 days. Please be sure
> to rate the service I provided to you today.
>
>
> ________________________________
> From: pwd_manager () hotmail com
> To: full-disclosure () lists grok org uk
> Date: Mon, 28 Oct 2013 16:33:52 -0700
> Subject: [Full-disclosure] ASUS RT-N13U Unsecured Telnet on LAN and WAN
>
>
> The ASUS RT-N13U home router comes configured with an unsecured telnet for
> user "admin".
> Telnetting in with this user will result in a root shell.  The telnet is not
> configurable from the web interface, nor does changing the password on the
> web interface's admin user make any difference.  I have alerted ASUS to the
> problem on 10/25/13.  I have been able to verify that this telnet interface
> is visible from both the LAN and WAN.
>
> Sincerely,
> Shellster
>
> _______________________________________________ Full-Disclosure - We believe
> in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted
> and sponsored by Secunia - http://secunia.com/
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/



-- 
-Craig
http://secur3.us/pub_key.asc

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/