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Dial-up connections to PBXes still exist They remain one of the most often used means of managing a PBX, especially by PBX vendors What used to be a console hard-wired to a PBX has now evolved to sophisticated machines that are accessible via IP networks and client interfaces That being said, the evolution and ease of access has left many of the old dial-up connections to some well-established PBXes forgotten PBX vendors usually tell their customers that they need dial-in access for external support Although the statement may be true, many companies handle this process very poorly and simply allow a modem to always be on and connected to the PBX What companies should be doing is calling a vendor when a problem occurs If the vendor needs to connect to the PBX, then the IT support person or responsible party can turn on the modem connection, let the vendor do their business, and then turn off the connection when the vendor is done with the job Because many companies leave the connection on constantly, war-dialing may produce some odd-looking screens, which we will display next Hacking PBXes takes the same route as described earlier for hacking typical dial-up connections

hp 1/2000 1/1500 1/1000 1/750 1/500 1/200 1/150 1/100 1/75 1/70 1/60 1/50 1/40 1/30 1/25 1/20 1/15 1/12 1/10 1/8 1/6 1/4 1/3 Watts 0373 0497 0746 0994 1490 3730 497 746 994 1070 1240 1490 1860 2490 2980 3730 4970 6210 746 932 1240 1860 2490

are responsible for Change any file or directory that does not have a valid reason for being world writable It can be hard to decide what should and shouldn t be world writable, so the best advice we can give is common sense If the file is a system initialization file, critical system configuration file, or user startup file, it should not be world writable Keep in mind that it is necessary for some devices in /dev to be world writable Evaluate each change carefully and make sure you test your changes thoroughly

Login: Login: Login: Login: Login: Login: Login: Login: Login: Login: Login:

The next time the system is rebooted, a SUID shell will be created in /tmp In addition, the /home/public directory is world writable Thus, attackers can overwrite any file in the directory via the mv command This is possible because the directory permissions supersede the file permissions Typically, attackers would modify the public users shell startup files (for example, login or bashrc) to create a SUID user file After public logs in to the system, a SUID public shell will be waiting for the attackers

Extended file attributes are beyond the scope of this text, but worth mentioning Many systems can be made more secure by enabling read-only, append, and immutable flags on certain key files Linux (via chattr) and many of the BSD variants provide additional flags that are seldom used but should be Combine these extended file attributes with kernel security levels (where supported), and your file security will be greatly enhanced

Password: Password: Password: Password: Password: Password: Password: Password: Password: Password: Password:

Popularity: Simplicity: Impact: Risk Rating: 6 6 7 6

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

The UNIX shell is extremely powerful and affords its users many conveniences One of the major features of the UNIX shell environment is its ability to program commands as well as to set specific options that govern the way the shell operates Of course, with this power come risk and many avenues of attack One common avenue of attack is abusing the Internal Field Separator (IFS) variable

If you come across a prompt/system that looks like this, take a peek and leave, because 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

The IFS variable is used to delimit input words used in a shell environment The IFS variable is normally set to a space character, which is the default shell behavior for delimiting shell commands If attackers can manipulate the IFS variable, they may be able to trick a SUID program into executing a Trojan file that will reward the attackers with root privileges Typically, a SUID shell script is tricked into giving up root access; however, our example uses the loadmodule program The loadmodule module exploit is a well-known attack that was discovered several years ago and exploits an IFS vulnerability in SunOS 41x

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

chmod 755 /tmp/bin/bin setenv IFS / /usr/openwin/bin/loadmodule /sys/sun4c/OBJ/evqmod-sun4co /etc/openwin/modules/evqload