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sean darcy

2017-Dec-30 23:49 UTC

[asterisk-users] SIP invite timeouts : how is someone sending invites from our server ??

I've been getting a lot of timeouts on non-critical invite transactions. 
I turned on sip debug. They were the result of SIP invites like this:

Retransmitting #10 (NAT) to 185.107.94.10:13057:
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 
215.45.145.211:5060;branch=z9hG4bK-524287-1---zg4cfkl50hpwpv4p;received=185.107.94.10;rport=13057
From:
<sip:a'or'3=3--@<myip-address>;transport=UDP>;tag=fptfih1e
To: <sip:00141225184741@<myip-address>;transport=UDP>;tag=as2913c67b
Call-ID: 5YpLDUSIs6l3xbDXsurYTu..
CSeq: 1 INVITE
Server: Asterisk PBX 13.19.0-rc1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH, MESSAGE
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk_home", 
nonce="14be1363"
Content-Length: 0

---
  WARNING[1868]: chan_sip.c:4065 retrans_pkt: Retransmission timeout 
reached on transmission 5YpLDUSIs6l3xbDXsurYTu.. for seqno 1 
(Non-critical Response) -- See 
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 32000ms with no response
  WARNING[1868]: chan_sip.c:4124 retrans_pkt: Timeout on 
5YpLDUSIs6l3xbDXsurYTu.. on non-critical invite transaction.

Looking up the ip addresses :

whois 185.107.94.10
.............
inetnum:        185.107.94.0 - 185.107.94.255
netname:        NFORCE_ENTERTAINMENT
descr:          Serverhosting
..................
organisation:   ORG-NE3-RIPE
org-name:       NForce Entertainment B.V.
org-type:       LIR
address:        Postbus 1142
address:        4700BC
address:        Roosendaal
address:        NETHERLANDS
phone:          +31206919299
...................

whois 215.45.145.211
.................
NetRange:       215.0.0.0 - 215.255.255.255
CIDR:           215.0.0.0/8
NetName:        DNIC-NET-215
NetHandle:      NET-215-0-0-0-1
Parent:          ()
NetType:        Direct Assignment
OriginAS:
Organization:   DoD Network Information Center (DNIC)
RegDate:        1998-06-04
Updated:        2011-06-21
Ref:            https://whois.arin.net/rest/net/NET-215-0-0-0-1

OrgName:        DoD Network Information Center
OrgId:          DNIC
Address:        3990 E. Broad Street
City:           Columbus
StateProv:      OH

So how is someone on a Dutch ISP using my server to mess with a US DoD 
ip address ?

Antony Stone

2017-Dec-31 01:10 UTC

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[asterisk-users] SIP invite timeouts : how is someone sending invites from our server ??

On Sunday 31 December 2017 at 00:49:17, sean darcy wrote:
> I've been getting a lot of timeouts on non-critical invite
transactions.
> So how is someone on a Dutch ISP using my server to mess with a US DoD
> ip address ?
What's your setting for "allowguest" (under [general]) in 
/etc/asterisk/sip.conf ?

What are your firewall rules for UDP 5060?


Antony.

-- 
Wanted: telepath.   You know where to apply.

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me.

Dovid Bender

2017-Dec-31 01:18 UTC

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[asterisk-users] SIP invite timeouts : how is someone sending invites from our server ??

Script kiddies trying to find vulnerable systems that they can make calls
on. Lock down the box with iptables and use fail2ban to block them. The via
is probably bogus unless a box at the DoD was comprimised.



On Sat, Dec 30, 2017 at 6:49 PM, sean darcy <seandarcy2 at gmail.com>
wrote:
> I've been getting a lot of timeouts on non-critical invite
transactions. I
> turned on sip debug. They were the result of SIP invites like this:
>
> Retransmitting #10 (NAT) to 185.107.94.10:13057:
> SIP/2.0 401 Unauthorized
> Via: SIP/2.0/UDP 215.45.145.211:5060;branch=z9h
> G4bK-524287-1---zg4cfkl50hpwpv4p;received=185.107.94.10;rport=13057
> From:
<sip:a'or'3=3--@<myip-address>;transport=UDP>;tag=fptfih1e
> To:
<sip:00141225184741@<myip-address>;transport=UDP>;tag=as2913c67b
> Call-ID: 5YpLDUSIs6l3xbDXsurYTu..
> CSeq: 1 INVITE
> Server: Asterisk PBX 13.19.0-rc1
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> WWW-Authenticate: Digest algorithm=MD5, realm="asterisk_home",
> nonce="14be1363"
> Content-Length: 0
>
> ---
>  WARNING[1868]: chan_sip.c:4065 retrans_pkt: Retransmission timeout
> reached on transmission 5YpLDUSIs6l3xbDXsurYTu.. for seqno 1 (Non-critical
> Response) -- See https://wiki.asterisk.org/wiki
> /display/AST/SIP+Retransmissions
> Packet timed out after 32000ms with no response
>  WARNING[1868]: chan_sip.c:4124 retrans_pkt: Timeout on
> 5YpLDUSIs6l3xbDXsurYTu.. on non-critical invite transaction.
>
> Looking up the ip addresses :
>
> whois 185.107.94.10
> .............
> inetnum:        185.107.94.0 - 185.107.94.255
> netname:        NFORCE_ENTERTAINMENT
> descr:          Serverhosting
> ..................
> organisation:   ORG-NE3-RIPE
> org-name:       NForce Entertainment B.V.
> org-type:       LIR
> address:        Postbus 1142
> address:        4700BC
> address:        Roosendaal
> address:        NETHERLANDS
> phone:          +31206919299
> ...................
>
> whois 215.45.145.211
> .................
> NetRange:       215.0.0.0 - 215.255.255.255
> CIDR:           215.0.0.0/8
> NetName:        DNIC-NET-215
> NetHandle:      NET-215-0-0-0-1
> Parent:          ()
> NetType:        Direct Assignment
> OriginAS:
> Organization:   DoD Network Information Center (DNIC)
> RegDate:        1998-06-04
> Updated:        2011-06-21
> Ref:            https://whois.arin.net/rest/net/NET-215-0-0-0-1
>
>
>
> OrgName:        DoD Network Information Center
> OrgId:          DNIC
> Address:        3990 E. Broad Street
> City:           Columbus
> StateProv:      OH
>
> So how is someone on a Dutch ISP using my server to mess with a US DoD ip
> address ?
>
>
> --
> _____________________________________________________________________
> -- 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:
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sean darcy

2018-Jan-02 22:23 UTC

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[asterisk-users] SIP invite timeouts : how is someone sending invites from our server ??

On 12/30/2017 08:10 PM, Antony Stone wrote:> On Sunday 31 December 2017 at 00:49:17, sean darcy wrote:
> 
>> I've been getting a lot of timeouts on non-critical invite
transactions.
> 
>> So how is someone on a Dutch ISP using my server to mess with a US DoD
>> ip address ?
> 
> What's your setting for "allowguest" (under [general]) in
> /etc/asterisk/sip.conf ?
> 
> What are your firewall rules for UDP 5060?
> 
> 
> Antony.
> allowguest=no
alwaysauthreject = yes

The only firewall rules for UDP 5060 forward the packets to asterisk.

sean

sean darcy

2018-Jan-02 22:30 UTC

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[asterisk-users] SIP invite timeouts : how is someone sending invites from our server ??

On 12/30/2017 08:18 PM, Dovid Bender wrote:> Script kiddies trying to find vulnerable systems that they can make 
> calls on. Lock down the box with iptables and use fail2ban to block 
> them. The via is probably bogus unless a box at the DoD was comprimised.
> 
> 
> 
> On Sat, Dec 30, 2017 at 6:49 PM, sean darcy <seandarcy2 at gmail.com 
> <mailto:seandarcy2 at gmail.com>> wrote:
> 
>     I've been getting a lot of timeouts on non-critical invite
>     transactions. I turned on sip debug. They were the result of SIP
>     invites like this:
> 
>     Retransmitting #10 (NAT) to 185.107.94.10:13057
>     <http://185.107.94.10:13057>:
>     SIP/2.0 401 Unauthorized
>     Via: SIP/2.0/UDP
>    
215.45.145.211:5060;branch=z9hG4bK-524287-1---zg4cfkl50hpwpv4p;received=185.107.94.10;rport=13057
>     From:
<sip:a'or'3=3--@<myip-address>;transport=UDP>;tag=fptfih1e
>     To:
<sip:00141225184741@<myip-address>;transport=UDP>;tag=as2913c67b
>     Call-ID: 5YpLDUSIs6l3xbDXsurYTu..
>     CSeq: 1 INVITE
>     Server: Asterisk PBX 13.19.0-rc1
>     Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY,
>     INFO, PUBLISH, MESSAGE
>     Supported: replaces, timer
>     WWW-Authenticate: Digest algorithm=MD5,
realm="asterisk_home",
>     nonce="14be1363"
>     Content-Length: 0
> 
>     ---
>      ?WARNING[1868]: chan_sip.c:4065 retrans_pkt: Retransmission timeout
>     reached on transmission 5YpLDUSIs6l3xbDXsurYTu.. for seqno 1
>     (Non-critical Response) -- See
>     https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
>     <https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions>
>     Packet timed out after 32000ms with no response
>      ?WARNING[1868]: chan_sip.c:4124 retrans_pkt: Timeout on
>     5YpLDUSIs6l3xbDXsurYTu.. on non-critical invite transaction.
> 
>     Looking up the ip addresses :
> 
>     whois 185.107.94.10
>     .............
>     inetnum:? ? ? ? 185.107.94.0 - 185.107.94.255
>     netname:? ? ? ? NFORCE_ENTERTAINMENT
>     descr:? ? ? ? ? Serverhosting
>     ..................
>     organisation:? ?ORG-NE3-RIPE
>     org-name:? ? ? ?NForce Entertainment B.V.
>     org-type:? ? ? ?LIR
>     address:? ? ? ? Postbus 1142
>     address:? ? ? ? 4700BC
>     address:? ? ? ? Roosendaal
>     address:? ? ? ? NETHERLANDS
>     phone: +31206919299 <tel:%2B31206919299>
>     ...................
> 
>     whois 215.45.145.211
>     .................
>     NetRange:? ? ? ?215.0.0.0 - 215.255.255.255
>     CIDR: 215.0.0.0/8 <http://215.0.0.0/8>
>     NetName:? ? ? ? DNIC-NET-215
>     NetHandle:? ? ? NET-215-0-0-0-1
>     Parent:? ? ? ? ? ()
>     NetType:? ? ? ? Direct Assignment
>     OriginAS:
>     Organization:? ?DoD Network Information Center (DNIC)
>     RegDate:? ? ? ? 1998-06-04
>     Updated:? ? ? ? 2011-06-21
>     Ref: https://whois.arin.net/rest/net/NET-215-0-0-0-1
>     <https://whois.arin.net/rest/net/NET-215-0-0-0-1>
> 
> 
> 
>     OrgName:? ? ? ? DoD Network Information Center
>     OrgId:? ? ? ? ? DNIC
>     Address:? ? ? ? 3990 E. Broad Street
>     City:? ? ? ? ? ?Columbus
>     StateProv:? ? ? OH
> 
>     So how is someone on a Dutch ISP using my server to mess with a US
>     DoD ip address ?
> 
> 
>     -- 
I don't see how fail2ban would help. asterisk isn't rejecting anything. 
There's no attempt with username/password.

How could I use iptables to "lock it down" ? We get sip calls from all
over. Is there something about the incoming packet we could use ? For 
instance , any packet containing a VIA instruction ? For that matter, 
can SIP be configured to drop any VIA request?

sean

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