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Intrusion prevention system (IPS) If you have the AIP-SSM card installed in an ASA, you can define policies to copy packets to or to redirect packets into the AIP-SSM card to look for and prevent attacks Anti-X If you have the CSC-SSM card installed in an ASA, you can define policies to have traffic redirected through the card to look for viruses, malware, spyware, phishing, and other types of issues with web, FTP, and e-mail applications
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You have already seen many reasons in the last section why you might want to use MPF However, I need to expand on one of these items, application inspection, to see some of the more hidden advantages that MPF provides The following three sections will discuss problems that certain applications and/or protocols might have and what MPF can do with application inspection to solve these problems The remainder of Part III will delve into many of the applications and protocols that Cisco can perform inspection on; the next sections will focus only on some simple examples TIP I m always asked when consulting or teaching Cisco security classes what s the difference between buying a SOHO firewall like a Linksys, Belkin, or D-Link compared with a security appliance like an ASA 5505 Low-end firewall products don t perform application inspection, and therefore they don t necessarily adequately protect the resources that sit behind them I ve always said that in networking, you typically get what you pay for: spending little money gets you little in the feature department
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Many applications have become famous for their security weaknesses E-mail and web applications are some of the more well-known ones, like Microsoft Exchange and IIS, Apache web server, and Sendmail Sendmail and Exchange use the SMTP protocol to implement TCP/IP e-mail solutions Many of the security weaknesses related to e-mail have to do with the supported commands used by SMTP to interact between devices You ll want to either configure your SMTP-based e-mail package to remove unnecessary commands, or use an alternative, more centralized solution, like the security appliances, to filter out unnecessary and undesirable commands and behaviors Some e-mail commands that are undesirable are debug and wiz Likewise, even legitimate commands can pose problems for e-mail for example, you wouldn t want someone using legitimate e-mail commands to harvest your e-mail directory and then to use the learned addresses for a spam attack
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Many applications, especially those related to multimedia, have issues with how they deal with port numbers As an example, a standard application like telnet uses a well-known
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destination port number for communications: 23 Anytime a device wants to connect to a telnet server, it opens an unused port above 1023 as the source port and uses 23 as the destination port Other applications, however, might use more than one connection to transmit data A multimedia application, for instance, might have the client open a control connection on a well-known port number, but additional connections might be opened on a range of dynamic port numbers to deliver the actual multimedia content This process makes secure filtering a more complicated task For example, if the data connections use completely random ports, how would the firewall device know what connections to allow Figure 10-1 illustrates this issue Basically you could use two solutions to solve this problem: You could configure very promiscuous ACLs to allow a large range of ports through your firewall This, of course, isn t very desirable since whether or not someone is using the application, the ACL would always allow the connections You could use an intelligent firewall that examines the control connection of the application to determine when the additional connection or connections are needed and the port numbers negotiated between the user and server; then you could have the firewall add this information to its state table to allow the connections and remove them when they are done
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Obviously, of the two solutions, the latter is the preferred approach Cisco supports this feature for many applications that flow through the appliance This application inspection process is enabled by default for many applications; however, for others you must manually enable application inspection
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