full-disclosure - Re: [FD] Grandstream VoIP phone: SSH key backdoor and multiple vulnerabilities leading to RCE as root (David Jorm

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Message-ID: <CAH8yC8kHNOpoTgcKGnnBF1b2rh8a2RXMqmsrz3wn6C_K3mBfSA@mail.gmail.com>
Date: Sat, 11 Jul 2015 21:18:10 -0400
From: Jeffrey Walton <noloader@...il.com>
To: Seamus Caveney <Seamus@...ivesolutionsmi.com>
Cc: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: Re: [FD] Grandstream VoIP phone: SSH key backdoor and multiple
 vulnerabilities leading to RCE as root (David Jorm

> A final issue I've reported to them in the past that's not resolved is the SSH host key being shared across all phones of the same firmware version.
>
> The authenticity of host '10.150.117.57 (10.150.117.57)' can't be established.
> RSA key fingerprint is 7f:83:e8:5c:0b:fb:d1:47:c7:f1:33:60:b1:28:b9:f9.
>
> The authenticity of host '10.150.117.65 (10.150.117.65)' can't be established.
> RSA key fingerprint is 7f:83:e8:5c:0b:fb:d1:47:c7:f1:33:60:b1:28:b9:f9.

This may (or may not) be a vulnerability.

If they allow you to shut down the port so that no one can connect
unless authorized by the owner, then its probably not a vulnerability.
But its still a poor choice for security engineering.

Do you know if the port can be closed?

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