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The following is a list of default accounts and passwords for the old System 75 package By default, AT&T included a large number of accounts and passwords already installed and ready for use Usually, these accounts will be changed by the owners either through proactive wisdom or through some external force such as an audit or security review Occasionally, these same default accounts might get reinstalled when a new upgrade occurs with the system Hence the original installation of the system may have warranted a stringent password change, but an upgrade or series of upgrades may have reinvoked the default account password Here is a listing of the known System 75 default accounts and passwords that are included in every Definity G package:

Let s examine what happened Once we enabled arpredirect, twister began to send forged ARP replies to shadow claiming to be crush Shadow happily updated its ARP table to reflect crush s new hardware address Then, a user from shadow began FTP and POP sessions to 1921682020 However, instead of sending this traffic to crush, the legitimate default gateway, shadow was tricked into sending the traffic to twister because its ARP table was modified to map twister s hardware address to the IP address of crush All traffic was redirected to 1921682020 via twister because we enabled IP forwarding using fragrouter, which caused twister to act as a router and forward all packets In the prior example, we were just redirecting traffic from shadow to crush; however, it is possible to redirect all traffic to twister by omitting the target (-t) option:

Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: enquiry init browse maint locate rcust tech cust inads support bcms bcms bcnas bcim bciim bcnas Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: enquirypw initpw looker rwmaint locatepw rcustpw field custpw inads supportpw bcms bcmpw bcnspw bcimpw bciimpw bcnspw

intercepting traffic from LAN to 10111 (^C to exit)

9:

Be aware that this may cause havoc on a network with heavy traffic If you are UNIX challenged, you may be wondering whether you can use arpredirect on a Windows system Unfortunately, arpredirect has not been ported but of course, alternatives exist On some switches it may be possible to plug your network connection into the uplink port on a simple hub Next, you can plug a UNIX-capable system running arpredirect into the hub along with a Windows system running your packet analyzer of choice The UNIX system will happily redirect traffic while your Windows systems grab all traffic on the local hub

Login: Login: Login: Login: Login:

As we have demonstrated, it is trivial to forge ARP replies and corrupt the ARP cache on most systems connected to your local network Where possible and practical, set static ARP entries between critical systems A common technique is to set static ARP entries between your firewall and border routers This can be accomplished as follows:

Password: Password: Password: Password: Password:

Popularity: Simplicity: Impact: Risk Rating: 5 5 8 6

[shadow] arp -s crush 00:00:C5:74:EA:B0 [shadow] arp -a crush (10111) at 00:00:C5:74:EA:B0 [ether] PERM on eth0

If you come across a prompt/system that looks like this, take a peek and leave, since you will more than likely not be able to defeat the mechanism used to protect it It uses a challenge response system that requires the use of a token

Note the PERM flag indicating that this is a permanent ARP entry On Windows you can set static default gateways thusly:

XX-Feb-XX 02:04:56 *91XXX5551234 C: CONNECT 9600/ARQ/V32/LAPM Hello Password : 89324123 : Hello Password : 65872901 :

C:\> arp a 10111 00-aa-00-62-c6-09

Wt Per 100 ft (lb) 74 107 124 205 310 380 320

U PBX Hacking Countermeasure be sure to reduce the time you keep the modem As with the dial-up countermeasures,

However, setting permanent static routes for internal network systems is not the most practical exercise in the world because of the sheer volume of systems you d need to touch Therefore, you can use a tool such as arpwatch (ftp://ftpeelblgov/arpwatch targz) to help keep track of ARP Ethernet/IP address pairings and to notify you of any changes To enable it, run arpwatch with the interface you would like to monitor:

turned on, deploy multiple forms of authentication, for example, two-way authentication (if possible), and always employ some sort of lockout on failed attempts

As you can see next, arpwatch detected arpredirect and noted it as flip-flopping in /var/ log/messages:

Popularity: Simplicity: Impact: Risk Rating: 2 8 9 6

May 21 12:28:49 crush: flip flop 10111 0:50:56:bd:2a:f5 (0:0:c5:74:ea:b0)

.