Re: Snort-users Digest, Vol 104, Issue 51

[Jutichai Thongkrachai <thsecmaniac () gmail com>]

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 () cisco com>
> To: Jutichai Thongkrachai <thsecmaniac () gmail com>
> Cc: "snort-users () lists sourceforge net" <snort-users () 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@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
>
> SOURCE*fire*, 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>
> 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>
> To: Jutichai Thongkrachai <thsecmaniac () gmail com>, "
> snort-users () lists sourceforge net" <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
>
> SOURCE*fire*, Inc. now part of *Cisco*
>
> 9780 Patuxent Woods Drive
> Columbia, MD 21046
>
> Phone: (office) 443.430.7112
>
> Email: allewi () cisco com
>
>
>
> *From:* Jutichai Thongkrachai [mailto:thsecmaniac () gmail com]
> *Sent:* Monday, January 26, 2015 11:46 PM
> *To:* 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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> ------------------------------------------------------------------------------
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> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming. The Go Parallel Website,
> sponsored by Intel and developed in partnership with Slashdot Media, is
> your
> hub for all things parallel software development, from weekly thought
> leadership blogs to news, videos, case studies, tutorials and more. Take a
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Attachment: snort.u2.1421728598.pcap
Description:

------------------------------------------------------------------------------
Dive into the World of Parallel Programming. The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net/

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