Re: Cisco Proprietary Protocol and Snort

["Al Lewis (allewi)" <allewi () cisco com>]

> 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@debian-7:/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 () cisco com

From: Joel Esler (jesler)
Sent: Tuesday, January 27, 2015 6:57 AM
To: Jutichai Thongkrachai
Cc: snort-users () 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 () gmail com<mailto:thsecmaniac () gmail com>> 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 () cisco com<mailto:allewi () cisco com>>
To: Jutichai Thongkrachai <thsecmaniac () gmail com<mailto:thsecmaniac () gmail com>>, "snort-users () lists 
sourceforge net<mailto:snort-users () lists sourceforge net>" <snort-users () lists sourceforge net<mailto:snort-users 
() 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 () cisco com<mailto:allewi () cisco com>

From: Jutichai Thongkrachai [mailto:thsecmaniac () gmail com<mailto:thsecmaniac () gmail com>]
Sent: Monday, January 26, 2015 11:46 PM
To: snort-users () lists sourceforge net<mailto:snort-users () 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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