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Electronic mail is such an integral part of business and, for many of us, our daily lives that it is hard to imagine getting by without it It has literally changed the way the world communicates and is so popular that millions of mail servers are spread across the Internet sending billions of messages each day As with so many things, increased popularity, use, and presence on the Internet also bring an increase in attention from potential attackers Mail servers have become very popular targets, which makes securing them a constant challenge for administrators Securing a mail server typically means removing or disabling unwanted functionality and ensuring the software is patched Earlier versions of mail server packages often contained bugs or even backdoors, such as the wiz command that gave potential attackers complete access to the host system As mail server software matured, attacks started to focus on three areas: reconnaissance, relaying, and buffer overflows Reconnaissance, or information discovery, on a mail server is rather simple The attacker s goal is to pull information from the system without having to authenticate or provide any information in return Reconnaissance usually involves an attacker attempting to discover the names and addresses of valid user accounts, which are used later for other purposes The two most common techniques use the vrfy and expn commands When an attacker connects to a mail server, usually by telnetting to port 25 on the target system, the attacker can enter commands and interact with the mail server itself The vrfy command was initially designed to allow servers to verify e-mail addresses For example, vrfy jones may yield a result of jones@samplecom This tells the attacker that the account jones does exist and gives the correct e-mail address for that account The expn command expands an alias list into the full list of e-mail addresses belonging to that list For example, expn all-users would provide a list of every e-mail.

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address belonging to the mailing list called all-users, if that mailing list existed As you can see, while neither of these commands causes any direct harm, they do provide some useful information For that reason, most administrators disable the vrfy and expn functions on their mail servers Relaying occurs when a mail server handles a message and neither the sender nor the recipient is a local user Essentially, an attacker can take advantage of the mail server to send out e-mail on her behalf, even though she is not a legitimate user of that system Spammers those parties responsible for filling your e-mail inbox with unwanted junk messages promising to make you rich beyond your wildest dreams actively seek out open mail relays so they can take advantage of someone else s resources to do their dirty work Attackers also seek out open relays and leverage them to launch e-mail attacks, flooding recipients with so many messages that their mailbox fills up or their mail server crashes Preventing your mail server from becoming an open relay usually involves ensuring only authenticated users are allowed to send outgoing mail Many mail server software packages, such as sendmail, now provide relay-prevention capabilities as part of the default install In most cases, you can also specify which systems, by system and domain name or IP address, are allowed to send mail through the server EXAM TIP The relay function should be disabled on ALL mail servers

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