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In this example, we enumerated the entire 19216810 Class C network using an ICMP TIME STAMP REQUEST However, the real power of icmpenum is to identify systems using spoofed packets to avoid detection Spoofed packets means they do not contain the true, legitimate IP address as its source address, thereby making it look like the scan is coming from another host on the network This technique is possible because icmpenum supports the ability to spoof packets with the -s option and passively listen for responses with the p switch To summarize, this step allows us to determine exactly what systems are alive via ICMP or through selective port scans Out of 255 potential addresses within the Class C range, we have determined that several hosts are alive and have now become our targets for subsequent interrogation

Figure 7-3

Although ping sweeps may seem like an annoyance, it is important to detect this activity when it happens Depending on your security paradigm, you may also want to block ping sweeps We explore both options next Detection As mentioned, network mapping via ping sweeps is a proven method for performing network reconnaissance before an actual attack ensues Therefore, detecting ping sweep activity is critical to understanding when and by whom an attack may occur The primary method for detecting ping sweep attacks involves using network-based IDS programs such as Snort (wwwsnortorg) From a host-based perspective, several UNIX utilities will detect and log such attacks If you begin to see a pattern of ICMP ECHO packets from a particular system or network, it may indicate that someone is performing network reconnaissance on your site Pay close attention to this activity, as a full-scale attack may be imminent Many commercial network and desktop firewall tools (from Cisco, Check Point, Microsoft, McAfee, Symantec, and ISS) can detect ICMP, TCP, and UDP ping sweeps However, just because the technologies exist to detect this behavior, it does not mean that someone will be watching when it occurs Over the years, we have been unable to deny the inescapable truth about monitoring functions: without eyeballs to watch the screens, understanding of what is being witnessed, and the wherewithal to react properly and swiftly, the best firewall tools and network intrusion detections tools are completely useless Table 2-1 lists additional UNIX ping-detection tools that can enhance your monitoring capabilities

To view the NDS trees available on the wire while within On-Site, simply select the Tree button on the button bar Don t forget that you will need to create an initial attachment to a server before you will be able to browse the tree

Resource http://wwwopenwallcom/scanlogd http://packetstormsecurityorg/UNIX/audit/courtney-13tarZ http://pltplpnet/ippl http://packetstormsecurityorg/UNIX/loggers/protolog108targz

Once attackers have staked out the premises (users and servers), they will begin jiggling the door handles (guessing passwords) Attackers will most likely do this by trying to log in At this point they have all the usernames; now they just need some passwords

Popularity: Simplicity: Impact: Risk Rating: 9 10 5 8

Table 2-1

Few other NetWare utilities hold such importance to the attacker (and administrator) as chknull This bindery-based tool works on both NetWare 3x servers and 4x servers with bindery context enabled The product is invaluable for both the attacker and administrator, locating accounts with null or easily guessed passwords Remember that NetWare does not require a password when creating a user (unless you re using a user template) As a result, many accounts are created with null passwords and never used, providing a wide-open door into most Novell servers To compound the problem, many users choose simplicity over security and will often make their password easy to remember (often due to poor security policies and inadequate enforcement) Use chknull to discover easily guessed passwords on a NetWare server:

.

Usage: -p : -n : -v : also chknull [-p] [-n] [-v] [wordlist ] check username as password don't check NULL password verbose output checks words specified on the command line as password