Martin Rogers wrote:
> 
>> If you allow calls to your default context to be relayed back out then
>> you can be in a position where unregistered entities can use your
>> machine to make free calls. I guess this is a "security issue".
>> Certainly that can be an issue that one should be careful of when
>> setting up a PBX.
>>
>> But when I hear the the term "security" and I am on a computer the first
>> thing that comes to my mind is an attack vector for taking control of
>> the machine itself. For example an ill-formed packet or sequence of
>> packets that cause the server application to crash in such a way that
>> executes part of your packet data left on the stack.
>>
>> From your response, I am I correct in believing that the issue is in
>> allowing guests is in the former (free calls) rather than in the latter
>> (taking control of your Asterisk box)?
>>
>> Thank you for any clarification.
>>
>> And, by the way, I was and am still a little take aback by seeing that
>> everything except a spawned session of mini_httpd runs as root in my
>> AstLinux box. I would much prefer that Asterisk run as its own
>> unprivileged user.
>>
>> Tod
> 
> Yes my own concern was one of preventing unwanted use of PSTN lines in
> an Asterisk box which was on the internet.

If you have the default 'default' context

[default]
exten => i,1,Hangup
exten => s,1,Hangup
exten => t,1,Hangup

There isn't much you can do.  So I'd say that's pretty safe.

Darrick

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