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If you see something like the following, your enable password can be easily decrypted in this manner:
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enable password 7 08204E
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On the other hand, if you see something like the following in your config file, your enable password is not vulnerable (but your telnet passwords still are):
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enable secret 5 $1$pUt$w8jwdabc5nHkj1IFWcDav
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The preceding shows the result of a smart Cisco administrator using the enable secret command that uses the MD5 algorithm to encrypt the password instead of the default enable password command, which uses the weak algorithm As far as we know, however, the MD5 password encryption is only available for the enable password and not for the other passwords on the system like vty login:
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line vty 0 4 password 7 08204E login
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The weak algorithm used is a simple XOR cipher based on a consistent salt, or seed, value Encrypted Cisco passwords are up to 11 case-sensitive alphanumeric characters The first two bytes of the password are a random decimal from 0x0 to 0xF, the remaining are the encrypted password that is XOR d from a known character block: dsfd;kfoA,iyewrkldJKDHSUB A number of programs exist on the Internet to decrypt this password, the first of which was a shell script from Hobbit (http://wwwavianorg) The second is a C program written by a hacker named SPHiXe called ciscocrackc, which can be found in a Cisco password analysis from a number of people (http://wwwrootshellcom/ archive-j457nxiqi3gq59dv/ 199711/ciscocrackchtml) The third version is a Palm Pilot application written by the L0pht s Dr Mudge and can be found at http://wwwl0phtcom~kingpin/ciscozip along with a complete analysis at http:// packetstormsecurifycom/cisco/ciscodecrypttechinfo bymudgetxt Finally, SolarWinds wrote a Cisco decryptor that runs on NT as part of their network management software suite and can be found at http://wwwsolarwindsnet Cisco Decryptor by SolarWinds For those of you more Windows enabled, a version of a Cisco decryptor can be purchased from SolarWinds out of Tulsa, Oklahoma The company develops network management software for large telecommunications companies and offers an integrated decryptor in their Cisco Config Viewer product as well as a stand-alone version As you can see in Figure 10-6, the GUI decrypts these passwords with ease
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U Cisco Password Decryption Countermeasure password is to use the enable Prevention The solution to the weak encrypted enable
secret command when changing passwords This command sets the enable password using the MD5 encryption algorithm, which has no known decryption technique Unfortunately, we know of no mechanism to apply the MD5 algorithm to all other Cisco passwords, such as the vty passwords
Hacking Exposed: Network Security Secrets and Solutions
Figure 10-6
SolarWinds Cisco Password Decryptor provides an easy GUI application to crack Cisco s weak passwords
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Popularity: Simplicity: Impact: Risk Rating: 9 6 9 8
Almost all routers support the use of Trivial File Transfer Protocol (TFTP) This is a UDP-based file-transfer mechanism used for backing up and restoring configuration files and runs on UDP port 69 Of course, detecting this service running on your devices is simple by using nmap:
[root@happy] nmap sU p69 nvv target
Exploiting TFTP to download the configuration files is usually trivial as well if the network administrators have used common configuration filenames For example, doing a reverse DNS lookup on a device we have on our network (19216801), we see that its DNS name is lax-serial-rtr Now we can simply try to download the cfg file with the following commands, using the DNS name as the config filename:
[root@happy] tftp > connect 19216801 > get lax-serial-rtrcfg > quit
If your router is vulnerable, you can now look in your current directory for the configuration file (lax-serial-rtrcfg) for the router This will most likely contain all the various SNMP community names along with any access control lists For more information about how TFTP works on Cisco devices, check out Packet Storm s Cisco archive section at http://packetstormsecurifycom/cisco/Cisco-Conf-008readme
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