[asterisk-users] Hack attempt sequential config file read looking for valid files.

[Tim S]

Is that IP in your network or outside (I can ping it so I'm guessing it's
outside your network)?  Do you have a firewall between your asterisk box
and the internet?  Is there a WHITELIST of IP addresses that only allow
your provider's limited IP pool to connect to your asterisk box from
outside?

If you are getting TFTP requests hitting your Asterisk box, they are not
properly being filtered at your firewall - ftp and tftp are considered
insecure communication methods, that port (69 I think) should be closed on
your firewall unless you have a really good reason to have it opened (and
unless you run a public FTP site, THERE IS NO GOOD REASON).

Fail2Ban is a BLACKLIST method, blacklists are most effective after good
network hygiene is implemented, as you drastically limit the pool of
potential bad actors with a whitelist.

Best,

-Tim

On Fri, Apr 21, 2017 at 9:38 AM, Dovid Bender <dovid at telecurve.com> wrote:

> This is old news. They use Shodan and then try to connect. Set up Fail2Ban
> that say after 10 404's to ban the IP.
>
>
> On Fri, Apr 21, 2017 at 12:27 PM, Jerry Geis <jerry.geis at gmail.com> wrote:
>
>> I "justed" happened to look at /var/log/messages...
>>
>> I saw:
>> Apr 21 12:18:40 in.tftpd[22719]: RRQ from 69.64.57.18 filename
>> 0004f2034f6b.cfg
>> Apr 21 12:18:40 in.tftpd[22719]: Client 69.64.57.18 File not found
>> 0004f2034f6b.cfg
>> Apr 21 12:18:40 in.tftpd[22720]: RRQ from 69.64.57.18 filename
>> 0004f2034f6c.cfg
>> Apr 21 12:18:40 in.tftpd[22720]: Client 69.64.57.18 File not found
>> 0004f2034f6c.cfg
>> Apr 21 12:18:40 in.tftpd[22721]: RRQ from 69.64.57.18 filename
>> 0004f2034f6d.cfg
>> Apr 21 12:18:40 in.tftpd[22721]: Client 69.64.57.18 File not found
>> 0004f2034f6d.cfg
>> Apr 21 12:18:40 in.tftpd[22722]: RRQ from 69.64.57.18 filename
>> 0004f2034f6e.cfg
>>
>> so basically an sequential read of polycom MAC address config files.
>> Some is trying to read to determine if I have any polycom files just
>> sequential read after read.
>> And if so - it would get any extension and password at that time.
>> Luckily I have none.
>>
>> However - how does one block attempts like this ?
>>
>> Thanks!
>>
>> Jerry
>>
>> --
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>
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at: https://community.asterisk.
> org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
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