Snort mailing list archives
Re: Confusion on Protocol Mismatch
From: "Lay, James" <james.lay () wincofoods com>
Date: Fri, 10 Dec 2010 09:07:28 -0700
Ryan, Here's the info: preprocessor ssh: server_ports { 22 } \ autodetect \ max_client_bytes 19600 \ max_encrypted_packets 20 \ max_server_version_len 100 \ enable_respoverflow enable_ssh1crc32 \ enable_srvoverflow enable_protomismatch openssh is set to ver 2 only: telnet 10.21.10.2 22 SSH-2.0-OpenSSH_5.6 Putty on 10.21.10.101 is set to only ver 2 as well. Pcap dump: 08:16:10.632806 IP 10.21.10.101.1180 > 10.21.10.2.22: Flags [P.], ack 2801084258, win 64551, length 52 0x0000: 4500 005c da00 4000 8006 f80a 0a15 0a65 E..\..@........e 0x0010: 0a15 0a02 049c 0016 256f 72ec a6f5 2762 ........%or...'b 0x0020: 5018 fc27 44c0 0000 de6b e538 ec71 3272 P..'D....k.8.q2r 0x0030: bdcf a540 ed35 eac4 8470 d3a4 f591 8e97 ...@.5...p...... 0x0040: c812 73cc e032 bf36 a2d4 86f6 1ded 0bf1 ..s..2.6........ 0x0050: 357b e01e 3c42 c917 ff6d 9793 5{..<B...m.. 08:26:23.587012 IP 10.21.10.101.1180 > 10.21.10.2.22: Flags [P.], ack 4249, win 64135, length 52 0x0000: 4500 005c eef8 4000 8006 e312 0a15 0a65 E..\..@........e 0x0010: 0a15 0a02 049c 0016 256f 7354 a6f5 37fa ........%osT..7. 0x0020: 5018 fa87 1ccc 0000 ea0a 5210 8398 7a2d P.........R...z- 0x0030: 0b61 ce8b 6b08 8bbb a8fb 3af1 c4bf bcc4 .a..k.....:..... 0x0040: 2508 01c0 dc31 3d5a be38 38a2 f144 83d4 %....1=Z.88..D.. 0x0050: d85e 301c d467 663a 111a 82cb .^0..gf:.... Ironically, 10.21.20.2 IS the snort machine ;) James -----Original Message----- From: Ryan Jordan [mailto:ryan.jordan () sourcefire com] Sent: Friday, December 10, 2010 9:01 AM To: Weir, Jason Cc: snort-users () lists sourceforge net Subject: Re: [Snort-users] Confusion on Protocol Mismatch I haven't changed it since Snort 2.8.5.3, about a year ago. James, that's an alert from the SSH preprocessor. It alerts in the event of non-SSH traffic on an SSH port, or a mismatch where one end uses SSH-1 and the other end uses SSH-2. Check the traffic that caused the alert. If it looks like it shouldn't have alerted, post the section of snort.conf that starts with "preprocessor ssh:". -Ryan On Fri, Dec 10, 2010 at 10:30 AM, Weir, Jason <jason.weir () nhrs org> wrote:
overnight I've seen a bunch of these as well did something change with 128-4? -J -----Original Message----- From: Lay, James [mailto:james.lay () wincofoods com] Sent: Friday, December 10, 2010 10:22 AM To: snort-users () lists sourceforge net Subject: Confusion on Protocol Mismatch Team, So...I'm confused on just where this is a protocol mismatch: 12/10-08:16:10.632806 [**] [128:4:1] (spp_ssh) Protocol mismatch [**] [Priority: 3] {TCP} 10.21.10.101:1180 -> 10.21.10.2:22 Relevant conf entries: var SSH_SERVERS [10.21.0.9,10.21.10.2,10.21.10.8] portvar SSH_PORTS 22 Thanks/Danke/Gracias James Lay IT Security Analyst WinCo Foods 208-672-2014 Office 208-559-1855 Cell 650 N Armstrong Pl. Boise, Idaho 83704 ______________________________________________________________________ _______________________ Please visit www.nhrs.org to subscribe to NHRS email announcements and updates. ---------------------------------------------------------------------- -------- _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
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Current thread:
- Confusion on Protocol Mismatch Lay, James (Dec 10)
- Re: Confusion on Protocol Mismatch Weir, Jason (Dec 10)
- Re: Confusion on Protocol Mismatch Ryan Jordan (Dec 10)
- Re: Confusion on Protocol Mismatch Lay, James (Dec 10)
- Re: Confusion on Protocol Mismatch Ryan Jordan (Dec 10)
- Re: Confusion on Protocol Mismatch Weir, Jason (Dec 10)