[Snort-users] Snort-users Digest, Vol 104, Issue 51

Al Lewis (allewi) allewi at ...589...
Wed Jan 28 07:17:47 EST 2015


Hello Jutichai,

                Yes.. When the decoder rules are enabled.

The decode.c function listed below shows which route that the layer 4 traffic takes as snort decodes it. So PIM,IP_MOBILITY,SUN_ND,SWIPE all get the same treatment. The exit stats also show that the PIM packets are categorized as “other”.

Attached is the pcap with only the packets from 10.4.1.1. I get the same behavior as before when I run your traffic.


01/20-00:23:14.492748  [**] [116:450:1] (snort_decoder) WARNING: BAD-TRAFFIC Bad IP protocol [**] [Classification: Detection of a non-standard protocol or event] [Priority: 2] {PIM} 10.4.1.1 -> 224.0.0.13
01/20-00:23:14.492748 00:11:92:40:5B:C4 -> 01:00:5E:00:00:0D type:0x800 len:0x3C
10.4.1.1 -> 224.0.0.13 PIM TTL:1 TOS:0xC0 ID:50050 IpLen:20 DgmLen:38
20 00 DF 0F 00 01 00 02 00 69 00 14 00 04 00 00   ........i......
00 6C                                            .l

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+


01/20-00:23:14.492748  [**] [1:1000001:0] PIM TEST [**] [Priority: 0] {PIM} 10.4.1.1 -> 224.0.0.13
01/20-00:23:14.492748 00:11:92:40:5B:C4 -> 01:00:5E:00:00:0D type:0x800 len:0x3C
10.4.1.1 -> 224.0.0.13 PIM TTL:1 TOS:0xC0 ID:50050 IpLen:20 DgmLen:38
20 00 DF 0F 00 01 00 02 00 69 00 14 00 04 00 00   ........i......
00 6C                                            .l

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+


Hope this helps.


Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi at ...589...

From: Jutichai Thongkrachai [mailto:thsecmaniac at ...11827...]
Sent: Tuesday, January 27, 2015 10:13 PM
To: snort-users at lists.sourceforge.net
Cc: Al Lewis (allewi); Joel Esler (jesler)
Subject: Re: Snort-users Digest, Vol 104, Issue 51

To Joel and Al,
Here the traffic in pcap format. I attached it into this mail. Please use "ip.addr==10.4.1.1" to filter the traffic that I have a question.
As Al said in the last mail, So, It's normal for Snort to detect PIM as BAD-TRAFFIC...?



---------- จดหมายที่ถูกส่งต่อ ----------
From: "Al Lewis (allewi)" <allewi at ...589...<mailto:allewi at ...589...>>
To: Jutichai Thongkrachai <thsecmaniac at ...11827...<mailto:thsecmaniac at ...11827...>>
Cc: "snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>" <snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>>
Date: Tue, 27 Jan 2015 14:02:33 +0000
Subject: Re: [Snort-users] Cisco Proprietary Protocol and Snort
From what I can see the PIM protocol will trigger these decoder alerts anytime that traffic is seen (along with several others). The case match we are interested in is the “IPPROTO_PIM”.

If you look in the source code of decode.c you will see:

2244         case IPPROTO_SWIPE:
2245         case IPPROTO_IP_MOBILITY:
2246         case IPPROTO_SUN_ND:
2247         case IPPROTO_PIM:
2248             if ( Event_Enabled(DECODE_IP_BAD_PROTO) )
2249                 DecoderEvent(p, EVARGS(IP_BAD_PROTO), 1, 1);


Under this function:

//--------------------------------------------------------------------
// decode.c::IP4 decoder
//--------------------------------------------------------------------

/* Function: DecodeIPv4Proto
*
* Gernalized IPv4 next protocol decoder dispatching.
*
* Arguments: proto => IPPROTO value of the next protocol
*            pkt => ptr to the packet data
*            len => length from here to the end of the packet
*            p   => pointer to the packet decode struct
*
*/
static inline void DecodeIPv4Proto(const uint8_t proto,
    const uint8_t *pkt, const uint32_t len, Packet *p)
{



I tested this with generic PIM traffic and it alerts on any PIM packets seen which is expected behavior.


root at ...17075...:/var/tmp/snort-2.9.7.0-released#<mailto:root at ...17075...:/var/tmp/snort-2.9.7.0-released#> ./bin/snort -c etc/pim.conf -r /home/alewis/Downloads/pim.pcap -Acmg -k none -q
09/30-05:32:56.889022  [**] [116:450:1] (snort_decoder) WARNING: BAD-TRAFFIC Bad IP protocol [**] [Classification: Detection of a non-standard protocol or event] [Priority: 2] {PIM} 192.168.0.6 -> 192.168.1.254
09/30-05:32:56.889022 CC:06:06:1C:F0:01 -> CC:05:06:1C:F0:00 type:0x800 len:0x8E
192.168.0.6 -> 192.168.1.254 PIM TTL:255 TOS:0x0 ID:350 IpLen:20 DgmLen:128
21 00 DE FF 00 00 00 00 45 00 00 64 00 0F 00 00  !.......E..d....
FE 01 F6 D2 C0 A8 14 0A EF 01 02 03 08 00 90 E1  ................
00 03 00 00 00 00 00 00 00 05 ED 60 AB CD AB CD  ...........`....
AB CD AB CD AB CD AB CD AB CD AB CD AB CD AB CD  ................
AB CD AB CD AB CD AB CD AB CD AB CD AB CD AB CD  ................
AB CD AB CD AB CD AB CD AB CD AB CD AB CD AB CD  ................
AB CD AB CD AB CD AB CD AB CD AB CD              ............

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+


09/30-05:32:57.054022  [**] [116:450:1] (snort_decoder) WARNING: BAD-TRAFFIC Bad IP protocol [**] [Classification: Detection of a non-standard protocol or event] [Priority: 2] {PIM} 192.168.1.254 -> 192.168.0.6
09/30-05:32:57.054022 CC:05:06:1C:F0:00 -> CC:06:06:1C:F0:01 type:0x800 len:0x3C
192.168.1.254 -> 192.168.0.6 PIM TTL:255 TOS:0xC0 ID:642 IpLen:20 DgmLen:38
22 00 16 28 01 00 00 20 EF 01 02 03 01 00 C0 A8  "..(... ........
14 0A                                            ..

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+




Hope this helps.

Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi at ...589...<mailto:allewi at ...589...>

From: Joel Esler (jesler)
Sent: Tuesday, January 27, 2015 6:57 AM
To: Jutichai Thongkrachai
Cc: snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>
Subject: Re: [Snort-users] Cisco Proprietary Protocol and Snort

We need an actual packet capture of the traffic.
--
Joel Esler
Sent from my iPhone

On Jan 27, 2015, at 6:36 AM, Jutichai Thongkrachai <thsecmaniac at ...11827...<mailto:thsecmaniac at ...11827...>> wrote:
Here you are.
>From Snorby:

http://i57.tinypic.com/egr4ms.png


>From Wireshark:

http://i57.tinypic.com/21vnt.png



---------- จดหมายที่ถูกส่งต่อ ----------
From: "Al Lewis (allewi)" <allewi at ...589...<mailto:allewi at ...589...>>
To: Jutichai Thongkrachai <thsecmaniac at ...11827...<mailto:thsecmaniac at ...11827...>>, "snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>" <snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>>
Cc:
Date: Tue, 27 Jan 2015 11:05:12 +0000
Subject: Re: [Snort-users] Cisco Proprietary Protocol and Snort
Can you provide a sample of the traffic?

Albert Lewis
QA Software Engineer
SOURCEfire, Inc. now part of Cisco
9780 Patuxent Woods Drive
Columbia, MD 21046
Phone: (office) 443.430.7112
Email: allewi at ...589...<mailto:allewi at ...589...>

From: Jutichai Thongkrachai [mailto:thsecmaniac at ...11827...<mailto:thsecmaniac at ...11827...>]
Sent: Monday, January 26, 2015 11:46 PM
To: snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>
Subject: [Snort-users] Cisco Proprietary Protocol and Snort

Hello,
My Snort keep telling me that it detect "snort_decoder: WARNING: BAD-TRAFFIC Bad IP protocol" (Sid:450,Gid:116) hourly which come from my Cisco Switch send Multicast Packet to the Network with its proprietary PIM protocol (sparse-dense-mode).
I'm curious that my Snort cannot decode Cisco PIM Protocol. So,it detect as
"WARNING: BAD-TRAFFIC Bad IP protocol" Is it possible?

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