Snort mailing list archives
Snort: WARNING: TCP Data Offset is less than 5!
From: Matthew Connor <M_CONNOR () comcast net>
Date: Wed, 25 Jun 2003 22:55:12 -0400
Hi all. I saw this on my snort box at my office and now I'm seeing it at home on my Comcast cable line. Any thoughts? (My IP is X'ed out, offender's IP is intact) [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/23/03-21:30:48.507915 0:8:21:96:56:7B -> 0:40:10:11:58:58 type:0x800 len:0x56 68.54.242.245:0 -> 65.X.X.X:0 TCP TTL:115 TOS:0x0 ID:18363 IpLen:20 DgmLen:72 DF 1**AP*S* Seq: 0x15C91AE Ack: 0x3D78DF67 Win: 0x5018 TcpLen: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:33:11.997545 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:9473 IpLen:20 DgmLen:40 12***RSF Seq: 0x3B0000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:34:24.784228 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:6443 IpLen:20 DgmLen:40 *******F Seq: 0x0 Ack: 0x119946C7 Win: 0x5014 TcpLen: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:34:56.844362 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:54587 IpLen:20 DgmLen:40 ******** Seq: 0x0 Ack: 0x119946C7 Win: 0x5014 TcpLen: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Header length exceeds packet length! [**] 06/25/03-11:35:04.986435 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:33344 IpLen:20 DgmLen:40 ***A*R** Seq: 0xE90000 Ack: 0x2279 Win: 0x5014 TcpLen: 32 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:35:28.975050 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:38734 IpLen:20 DgmLen:40 12***RSF Seq: 0x900000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:37:02.195702 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:33922 IpLen:20 DgmLen:40 12***RSF Seq: 0x100000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:37:18.491995 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:21132 IpLen:20 DgmLen:40 12***RSF Seq: 0x0 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:38:47.651281 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:52410 IpLen:20 DgmLen:40 12***RSF Seq: 0xC30000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:39:01.470238 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:35266 IpLen:20 DgmLen:40 12***RSF Seq: 0x10000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:39:12.940392 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:2249 IpLen:20 DgmLen:40 12***RSF Seq: 0x0 Ack: 0xD1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:39:50.613856 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:7901 IpLen:20 DgmLen:40 12***RSF Seq: 0x8EED0000 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:40:51.100937 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:22013 IpLen:20 DgmLen:40 12***RSF Seq: 0x0 Ack: 0xD1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ [**] (snort_decoder) WARNING: TCP Data Offset is less than 5! [**] 06/25/03-11:40:54.817408 0:8:E2:35:D8:8C -> 0:E0:29:53:E0:6B type:0x800 len:0x3C 68.54.242.245:0 -> 68.59.18.148:0 TCP TTL:115 TOS:0x0 ID:13824 IpLen:20 DgmLen:40 12***RSF Seq: 0x0 Ack: 0x1199 Win: 0x5014 TcpLen: 16 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ --Matthew ------------------------------------------------------- This SF.Net email is sponsored by: INetU Attention Web Developers & Consultants: Become An INetU Hosting Partner. Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! 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- Snort: WARNING: TCP Data Offset is less than 5! Matthew Connor (Jun 25)