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VTP is a central messaging protocol that maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs within a VTP domain A VTP domain (also called a VLAN management domain) is made up of one or more network devices that share the same VTP domain name All devices must be interconnected by trunks because VTP only communicates over trunk ports Attackers who can gain access to a trunk port have the potential to send out VTP messages as a server with no VLANs configured If this occurs, all VLANs would be deleted throughout the VTP domains Automated tools are known to be available in the hacker community

User Access Verification Password:

Popularity: Simplicity: Impact: Risk Rating: 10 10 2 7

VTP can cause more problems than it solves; it is recommended that you set a password and set vtp mode to transparent, as shown next:

In the preceding example, we suspect that the IP address 19216801 is a Cisco router, but we can use nmap s operating system (OS) identification to confirm our assumption

As with most system equipment, a security checklist should exist before any equipment is plugged in The secure IOS template (http://wwwcymrucom/Documents/secureios-templatehtml) by Rob Thomas is recommended

10:

Internet Protocol Version 4 (IPv4)

*Gray connectors provided with assembled o-ring and metal locknuts Black connectors provided with nylon locknuts only

With TCP port 13 open, we scan using nmap s O parameter to detect the operating system present on the device in our case, Cisco IOS 112

Internet Protocol version 4 has no built-in security measures Most all Internet traffic depends on IPv4 and is at risk A good strategy is to acknowledge the lack of security and plan ahead Allot time to implement some type of line of defense Reliable security measures are not to be found out of the box

[root@source /tmp]# nmap -O -p13 -n 19216801 Starting nmap V 212 by Fyodor (fyodor@dhpcom, wwwinsecureorg/nmap/) Warning: No ports found open on this machine, OS detection will be MUCH less reliable Interesting ports on (1722911254): Port State Protocol Service 13 filtered tcp daytime Remote operating system guess: Cisco Router/Switch with IOS 112

A SYN packet is sent to start every TCP session The first SYN packet contains an initial random number called a sequence number Every packet in the TCP session follows in sequence, increasing by one each time If a host receives a packet on a correct port and source IP, it checks the sequence number If this number matches, the packet and data are trusted With some older IOS versions, this sequence number could be guessed As of IOS 120(15) and 121(7), this problem has been fixed If the sequence number can be

Be sure to restrict your OS identification scans to a single port whenever possible A number of OSes, including Cisco s IOS and Sun s Solaris, have known problems with the non RFC compliant packets it sends and will bring down some boxes Please see 2, Scanning, for a detailed description of Stack fingerprinting

guessed, spoofed packets can easily be injected, leading to a data compromise, denial of service, or session hijacking

U OS Identification Countermeasure detecting and preventing an OS identificaDetection and Prevention The technique for

Popularity: Simplicity: Impact: Risk Rating: 10 10 1 7

IP Version 6 (IPv6) or IP: Next Generation (IPng)

While not truly a Cisco vulnerability, the Cisco Packet Leakage vulnerability demonstrates another way of identifying a Cisco device Originally made public by JoeJ of the Rhino9 Team on Bugtraq, the Cisco information leakage vulnerability has to do with the way Cisco responds to TCP SYN requests on port 1999 (Cisco s ident port) Cisco s unofficial response to this vulnerability was posted to Bugtraq by John Bashinski The exploit is trivial To determine if a particular device is a Cisco, simply perform a TCP scan of port 1999 Using nmap, we can do this easily with the following command:

IPv6 is the replacement for IPv4, mostly due to the supposed lack of IPv4 addressing space IPv6 uses a128-bit IP address made up of eight 16-bit integers, separated by colons Here s a sample address:

Now we capture the RST/ASK packet received with packet capture software As you can see in Figure 10-2, by examining the data portion of the packet, you ll notice the word cisco is present

ABCD:EF01:2345:6789:0123:4567:8FF1:2345

Figure 10-2