Snort mailing list archives
Re: SMTP Preprocessor : X-ANONYMOUSTLS command
From: "Al Lewis (allewi)" <allewi () cisco com>
Date: Wed, 11 Mar 2015 13:30:35 +0000
Hello, I would think that the “"SMTP_UNKNOWN_CMD” 124:5 command would have alerted once you added it to alert on unknown cmds if it is indeed unknown. Is the data for this new command longer than 512 chars? Im asking because you are not getting alerts for unknown commands but just the length of the command. If it is then you may want to change the “max_command_line_len 512” to something larger. Below is the section from the SMTP preprocessor section 42. http://manual.snort.org/node17.html#SECTION00328000000000000000 “max_command_line_len <int> Alert if an SMTP command line is longer than this value. Absence of this option or a "0" means never alert on command line length. RFC 2821 recommends 512 as a maximum command line length.” A pcap and conf file would help a lot but I know this is not always possible. ☺ 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: Dan Roberts [mailto:danroberts2604 () gmail com] Sent: Wednesday, March 11, 2015 5:36 AM To: snort-users () lists sourceforge net Subject: [Snort-users] SMTP Preprocessor : X-ANONYMOUSTLS command Hi Guys, I'm getting continuously FP (I presume) alerts associated to SMTP traffic (124:1:1 (smtp) Attempted command buffer overflow: more than 512 chars). One week ago I made a trace and noticed that many MS Exchange servers on our networks use a special SMTP command (X-ANONYMOUSTLS) not referenced in the Snort SMTP preprocessor. First, I tried to add "alert_unknown_cmds" to see if the preprocessor didn't know that command. No output at all. Then, I tried to list all the commands understood by the preprocessor, using "print_cmds" and restarted snort with -M to have time to investigate the output of the command. Again, no output at all..... Did someone use those commands successfully once ? Additionally, I'm wondering why is there so few information about that X-ANONYMOUSTLS command... Cheers Dan
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Current thread:
- SMTP Preprocessor : X-ANONYMOUSTLS command Dan Roberts (Mar 11)
- Re: SMTP Preprocessor : X-ANONYMOUSTLS command Al Lewis (allewi) (Mar 11)
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- Re: SMTP Preprocessor : X-ANONYMOUSTLS command stephane.nasdrovisky (Mar 12)
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