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Internet-based e-mail systems have been widely known to be an easy way of hacking into your network The reason is that these e-mail systems are based on SMTP (Simple Mail Transport Protocol) and ESMTP (extended SMTP), which are well documented However, many extensions have been added, including proprietary extensions by certain vendors Sendmail is one of the more popular UNIX SMTP e-mail systems, and its source code is open to the public, which means that hackers have spent a lot of time figuring out the weaknesses in this application
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To prevent e-mail attacks, appliances implement ESMTP inspection by default Prior to version 7, only the SMTP protocol was supported Staring in version 7, ESMTP was added This feature only allows certain SMTP commands or messages, defined in RFC 821, section 451, and certain ESMTP commands on an e-mail connection All other commands in SMTP connections are changed to Xs, which the internal e-mail server will reject Supported SMTP commands include DATA, HELO, MAIL, NOOP, QUIT, RCPT, and RSET Supported ESMTP commands include AUTH, EHLO, ETRN, HELP, SAML, SEND, SOML, and VRFY Other security features are also implemented to protect the e-mail server, including the following: Mask the e-mail server banner to asterisks ( * ) to hide/obfuscate the banner, which might give information to the hacker about the type of e-mail server you are using Monitor e-mail commands and responses and the sequence they occur in to make sure that the e-mail connection is acting according to the RFCs
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Look for a pipe ( | ) in a MAIL or RCPT command and close the e-mail session (This was a bug in some e-mail implementations that allowed hackers to have the e-mail server execute programs and redirect the output) Create an audit trail of specified actions against the e-mail
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NOTE SMTP and ESMTP inspection only applies to inbound (lower to higher level) traffic
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Layer 7 policy maps allow you to define policies about what you want to allow for e-mail connections based on what is in the SMTP and/or ESTMP payload Layer 7 class maps are unsupported for further classification When creating a layer 7 policy map for e-mail inspection, you have the following commands available to you:
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ciscoasa(config)#policy-map type inspect esmtp L7_policy_map_name ciscoasa(config-pmap)# parameters ciscoasa(config-pmap-p)# mail-relay domain_name action [drop-connection] [log] ciscoasa(config-pmap-p)# mask-banner ciscoasa(config-pmap-p)# exit ciscoasa(config-pmap)# match body length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match body line length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match cmd RCPT count gt #_of_recipients ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match cmd line length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match cmd verb command1 [ commandX] ciscoasa(config-pmap-c)# [rate-limit #_per_second | drop-connection | reset] [log] ciscoasa(config-pmap)# match ehlo-reply-parameter parameter ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match header length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match header line length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match header to-fields count gt #_of_recipients ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match invalid-recipients count gt #_of_recipients ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match [not] mime encoding type
Cisco ASA Configuration
ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match [not] mime filename length gt bytes ciscoasa(config-pmap)# match [not] mime filetype regex {class regex_class_name | regex_name} ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match sender-address length gt bytes ciscoasa(config-pmap-c)# [drop-connection | reset] [log] ciscoasa(config-pmap)# match [not] sender-address regex class regex_class_name ciscoasa(config-pmap-c)# [drop-connection | reset] [log]
Two options are under the parameters subcommand mode The mail-relay command allows you to restrict what domain name you ll allow for your e-mail servers this is used to prevent relaying of mail via a rogue server The mask-banner command obfuscates (changes) the server e-mail banner, thereby making it harder for an attacker to learn information about your server The remaining policies are configured with the match command When executing this command, you are taken into a second subcommand mode where you can specify your policy: drop the connection, log the match, reset the TCP connection, and, with certain match commands, rate-limit the e-mail commands sent on the connection Table 12-1 has a summary of what each of these commands looks for in an e-mail message
match Command match body length gt match body line length gt match cmd RCPT count gt match cmd line length gt match cmd verb match ehlo-reply-parameter match header length gt match header line length
Description Specifies the length of the body of a message Specifies the length of a line in the body of a message Specifies the number of recipients Specifies the length of a command line Specifies the e-mail command to match on Specifies the EHLO reply parameter to look for, like AUTH Specifies the length of the header of a message Specifies the length of a line in the header of a message
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