Good afternoon everyone
I get a new query regarding a type of attack that our freeswitch servers receive constantly in case someone knows how to block them.
These are INVITE or REGISTER requests in which the FROM: field arrives with the ip and port equal to the public interface of the server, so the different protection options that I have tried have not blocked these requests:
- IpTables can not filter by the information From the INVITE message.
- Fail2Ban is equally limited than IpTables.
- ACLs have not resolved to filter these requests.
Does anyone know any way to block these requests?
I send here a trace with an INVITE message where you can see a request of this type.
Thanks and best regards.
U 2017/12/14 18:32:55.156886 185.107.94.121:11120 -> 182.30.1.194:5060
INVITE sip:390239297988@ 182.30.1.194:5060;transport=
UDP SIP/2.0. Via: SIP/2.0/UDP 122.221.117.131:5060;branch=
z9hG4bK-524287-1--- xi3qy2kz737ni404. Max-Forwards: 70.
Contact: <sip:15714000000@122.221.117.
131:5060;transport=UDP>. To: <sip:390239297988@ 182.30.1.194;transport=UDP>.
From: <sip:15714000000@ 182.30.1.194;transport=UDP>;
tag=hlzg2jcv. Call-ID: KaQqH51mAcFv34qN8cGyv3...
CSeq: 1 INVITE.
Content-Type: application/sdp.
User-Agent: Z 3.14.38765 rv2.8.3.
Allow-Events: presence, kpml, talk.
Content-Length: 0.
.
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