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Network-sniffing programs such as tcpdump, Snort, and Wireshark allow system and network administrators to view the traffic that passes across their network These programs are extremely popular and provide valuable data when trying to debug network problems In fact, network intrusion detection systems are based on sniffing technology and are used to look for anomalous behavior by passively sniffing traffic off the network While providing an extremely valuable service, most sniffers must run with root privileges It should be no surprise that network sniffers can be compromised by an attacker who is able to send malicious packets to the network where the sniffer resides Attacking a sniffer that is running in promiscuous mode is an interesting proposition because the target system doesn t require any listening ports You read that correctly You can remotely compromise a UNIX system that is running in promiscuous mode by exploiting vulnerabilities (for example, buffer overflows) in the sniffer program itself, even if the system has every TCP/UDP service disabled A good example of such an attack is a vulnerability in tcpdump version 352 This particular version of tcpdump is vulnerable to a buffer overflow condition in the Andrew Files System (AFS) parsing code Therefore, an attacker could craft a packet that when decoded by tcpdump would

Italic formatting (often called italics) is good for emphasizing a word or phrase for example, a term that you re introducing and that you then explain You can apply italic in any of these ways:

After the command has run, insert your card and run an ipconfig /all to verify the MAC address has changed Linux systems can use the ifconfig command to change the MAC You ll need to bring down the interface first, then issue the new hardware Ethernet address, and finally bring the interface back up and check the results Here is a sample command sequence to use As you can see, the wireless interface is eth1 and the MAC we wish to use is 00:02:2D:07:E1:FF

Bold, italic, and underline can all be effective for drawing the reader s eye, but use them sparingly for best effect If every other word has added emphasis, none will stand out

[root@localhost [root@localhost [root@localhost [root@localhost eth1 root]# root]# root]# root]# ifconfig ifconfig ifconfig ifconfig eth1 down eth1 hw ether 00:02:2D:07:E1:FF eth1 up eth1

Link encap:Ethernet HWaddr 00:02:2D:07:E1:FF UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15 errors:2388 dropped:0 overruns:0 frame:2388 TX packets:10 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:720 (7200 b) TX bytes:3300 (32 Kb) Interrupt:3 Base address:0x100

CHAPTER 4:

FreeBSD systems use the ifconfig command as well, but with a slightly different context Bring down the interface before applying changes, just as in Linux, but omit the hw and colons in the address itself:

In the days of typewriters (which couldn t produce italics), underlining was the standard way of conveying emphasis But now that word processors make italics easy, people tend to use italics instead To make underlines more useful, Word lets you create not just basic (single) underlines but double underlines, word-only underlines (a line under words and punctuation but not under spaces), squiggly underlines, and other types You can apply underlines in any of these ways:

Then bring the interface up and check it to make sure the changes have taken effect OpenBSD users can use the sea utility to change the MAC address because the supplied version of ifconfig does not support that capability Sea does not have an official download location, so the easiest way to find it is with a Google search for openbsd and seac Sea s operation is very straightforward and works in the following manner

used At first in each Word session, this button gives you a standard underline, but you can click the drop-down arrow and choose a different type of underline from the panel If you don t see the underline type you want, click the More Underlines item to open the Font dialog box Click the Underline button again to turn the underline off Use the Underline Color submenu to choose an underline color

In this example, wi0 is the wireless interface and 00:02:2D:07:E1:FF is the MAC address we want to use:

To turn underlining off, choose the (None) option at the top of the list In the Underline Color drop-down list, select the underline color you want