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You may recall that we discussed in s 1 through 3 ways to identify UNIX systems and enumerate information We used port scanners such as nmap to help identify open TCP/UDP ports as well as to fingerprint the target operating system or device We used rpcinfo and showmount to enumerate RPC service and NFS mount points, respectively We even used the all-purpose netcat (nc) to grab banners that leak juicy information such as the applications and associated versions in use In this chapter, we will explore the actual exploitation and related techniques of a UNIX system It is important to remember that footprinting and network reconnaissance of UNIX systems must be done before any type of exploitation Footprinting must be executed in a thorough and methodical fashion to ensure that every possible piece of information is uncovered Once we have this information, we need to make some educated guesses about the potential vulnerabilities that may be present on the target system This process is known as vulnerability mapping

Unfortunately, there s not a lot you can do to plug this leak, as this is NFS s default behavior Just make sure that your exported file systems have the proper permissions (read/write should be restricted to specific hosts) and that NFS is blocked at the firewall (port 2049) showmount requests can also be logged another good way to catch interlopers NFS isn t the only file system sharing software you ll find on UNIX/Linux anymore, thanks to the growing popularity of the open-source Samba software suite, which provides seamless file and print services to SMB clients SMB (Server Message Block) forms the underpinnings of Windows networking, as described previously Samba is available from wwwsambaorg and distributed with many Linux packages Although the Samba server configuration file (/etc/smbconf) has some straightforward security parameters, misconfiguration can still result in unprotected network shares

8:

Vulnerability mapping is the process of mapping specific security attributes of a system to an associated vulnerability or potential vulnerability This is a critical phase in the actual exploitation of a target system that should not be overlooked It is necessary for attackers to map attributes such as listening services, specific version numbers of running servers (for example, Apache 139 being used for HTTP and sendmail 8910 being used for SMTP), system architecture, and username information to potential security holes There are several methods attackers can use to accomplish this task: M Manually map specific system attributes against publicly available sources of vulnerability information such as Bugtraq, Computer Emergency Response Team advisories (wwwcertorg), and vendor security alerts Although this is tedious, it can provide a thorough analysis of potential vulnerabilities without actually exploiting the target system Use public exploit code posted to various security mailing lists and any number of web sites, or write your own code This will determine the existence of a real vulnerability with a high degree of certainty Use automated vulnerability scanning tools to identify true vulnerabilities Respected commercial tools include the Internet Scanner from Internet Security Systems (wwwissnet) or CyberCop Scanner from Network Associates (wwwnaicom) On the freeware side, Nessus (wwwnessusorg) and SAINT (http://wwwwwdsicom/saint/) show promise

After time, information is the second most powerful tool available to the malicious computer hacker Fortunately, it can also be used by the good guys to lock things down Of course, we ve touched on only a handful of the most common applications, because time and space prevent us from covering the limitless diversity of network software that

All these methods have their pros and cons; however, it is important to remember that only uneducated attackers known as script kiddies will skip the vulnerability mapping stage by throwing everything and the kitchen sink at a system to get in without knowing how and why an exploit works We have witnessed many real-life attacks where the perpetrators were trying to use UNIX exploits against a Windows NT system Needless to say, these attackers were inexpert and unsuccessful The following list summarizes key points to consider when performing vulnerability mapping: M I I L Perform network reconnaissance against the target system Map attributes such as operating system, architecture, and specific versions of listening services to known vulnerabilities and exploits Perform target acquisition by identifying and selecting key systems Enumerate and prioritize potential points of entry

3:

TABLE 220-55