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The data will appear in the logic analyzer in the raw, which isn t very user friendly However, with a bit of work and some documentation from the chip maker, decoding the information is feasible To make life easier, some logic analyzers have built-in decoders for common bus protocols like I2C, SPI, and Serial

Popularity: Simplicity: Impact: Risk Rating: 5 5 10 7

Most embedded devices require some form of custom firmware to run These firmware files are field upgradable and can be loaded by the user Firmware upgrades are often hosted on manufacturers websites or available upon request from the manufacturer Looking inside of firmware files can lead to a plethora of juicy information about the device, such as default passwords, administrative ports, and debugging interfaces The fastest way to inspect the firmware file is using a hex editor like 101 Editor, available from SweetScape Software 101 Editor is shown in Figure 9-15 Figure 9-15 illustrates the firmware image loaded into the hex editor From the decodes in editor, we can guess that AES encryption is being used Another useful tool when looking at custom firmware or binaries is the UNIX command strings The strings utility prints all of the ASCII strings from a binary Many developers hard code passwords, keys, or other useful information for an attacker We ve listed some example output from running strings against some firmware next:

Once attackers penetrate an NT system and gain administrative control through other means, they can upload their own profiles (CIF or MAINSAB files, for example) and automatically gain access to the system with their own password! Both pcAnywhere and Remotely Possible 40 are vulnerable to this attack To do this, an attacker will perform the following steps: 1 Create a connection profile in your own copy of pcAnywhere or Remotely Possible 2 Locate and copy this new profile to the \DATA or \AVALAN\REMOTELY POSSIBLE directory on the target system 3 Use pcAnywhere or Remotely Possible 40 to connect to the system, and use your own username and password to gain access If your software product uses separate files to store the authorized connections, your product is most likely vulnerable to this attack Test this yourself

bootcmd=run setargs; run add${bootfs}; bootn bootdelay=1 baudrate=115200 ethaddr=00:10:25:07:00:00 mtdids=nand0=Nand mtdparts=mtdparts=Nand:2M(Boot),24M(FS1),24M(FS2),14M(RW) addcramfs=setenv bootargs ${bootargs} root=/dev/mtdblock_robbs1 ro addnfs=setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}::::${ethport} root=/dev/nfs rw nfsroot=${serverip}:${rootpath},tcp,nfsvers=3 setargs=setenv bootargs console=ttyS0,0 autostart=yes ethport=eth0 rootpath=/rootfs ipaddr=19216802 serverip=19216801 bootfs=cramfs bootcmd=boota

U Countermeasures A number of countermeasures can be taken to remedy the security issues addressed earlier The following security steps will go a long way in tightening your installation Enable Passwords Although obvious and intuitive to most administrators, simply forcing usernames and passwords on remote machines is not always followed Vendors don t always help this situation, as they rely on the administrators to enable this security As you can see with pcAnywhere, shown in Figure 13-2, the default authentication scheme is too liberal Simply change this setting to Specify Individual Caller Privileges to remedy the situation Enforce Strong Passwords Some applications like pcAnywhere allow you to enforce stronger passwords such as case sensitivity To enable this capability in pcAnywhere, choose the properties of your Network entry Select the Security Options tab and the Make Passwords Case Sensitive check box As you can see in Figure 13-3, the default Login option does not enable password case sensitivity

9:

Figure 13-2

Peak is the maximum or highest point on the sine wave To convert rms to peak, multiply by 1414 A 120-volt rms thus has a 16968-volt peak Peak-to-peak (p-p) is a term used to describe the signal voltage in television receivers It is a term used more with electronics than with electrical work

Figure 13-3

From the output we can see that the file system used is cramfs We will use this information to explore more of the firmware Let s try and mount the firmware image using the Linux/UNIX mount command:

One of the many security features built in to pcAnywhere Make Passwords Case Sensitive Just make sure you enable it!

adam@blackbox:/tmp$ sudo mount -o loop -t cramfs /home/adam/0AAEAAAA /tmp/cram/ adam@blackbox:/tmp$ cd /tmp/cram adam@blackbox:/tmp/cram$ ls -al total 14

13: