Snort mailing list archives
Re: SMTP Preprocessor question
From: James Lay <jlay () slave-tothe-box net>
Date: Tue, 24 Nov 2015 09:32:42 -0700
I believe you are correct. James On 2015-11-24 08:42, Avery Rozar wrote:
Hello, I'm looking for some help understanding the SMTP preprocessor. For example. the attached pcap is from a hit on "smtp: Attempted data header buffer overflow, sid: 2; gid: 124". Digging in the PCAP the only thing (other than this looks like junk email) I can come up with is the "List" command to unsubscribe looks like it's longer than the 512 specified in the "max_command_line_len" parameter. Am I correct in this finding, or way off? Here is the preprocessor.rules: alert ( msg: "SMTP_DATA_HDR_OVERFLOW"; sid: 2; gid: 124; rev: 1; metadata: rule-type preproc, service smtp, policy security-ips drop ; classtype:attempted-admin; reference:cve,2002-1337; reference:cve,2010-4344; ) Here is the Snort config file: # SMTP normalization and anomaly detection. For more information, see README.SMTP preprocessor smtp: ports { 25 465 587 691 } \ inspection_type stateful \ b64_decode_depth 0 \ qp_decode_depth 0 \ bitenc_decode_depth 0 \ uu_decode_depth 0 \ log_mailfrom \ log_rcptto \ log_filename \ log_email_hdrs \ normalize cmds \ normalize_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \ normalize_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \ normalize_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \ normalize_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \ max_command_line_len 512 \ max_header_line_len 1000 \ max_response_line_len 512 \ alt_max_command_line_len 260 { MAIL } \ alt_max_command_line_len 300 { RCPT } \ alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \ alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \ alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN DATA RSET QUIT ONEX QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \ valid_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND ESOM ETRN EVFY } \ valid_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET SAML SEND SOML } \ valid_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP X-ERCP X-EXCH50 } \ valid_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \ xlink2state { enabled } ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ 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://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140
_______________________________________________ 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://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- SMTP Preprocessor question Avery Rozar (Nov 24)
- Re: SMTP Preprocessor question James Lay (Nov 24)
- Re: SMTP Preprocessor question Avery Rozar (Nov 24)
- Re: SMTP Preprocessor question James Lay (Nov 24)