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[roz]$ /ucd-snmpd-cs 10011 161 $ nc 10011 2834 id uid=0(root) gid=0(root) group=0(root)

[tsunami]$ gping usage: gping a0 aN b0 bN c0 cN gping a b0 bN c0 cN gping a b c0 cN gping a b c gping a b c

As you can see from this example, it is easy to exploit this overflow and gain root access to the vulnerable system It took little work for us to demonstrate this vulnerability, so you can imagine how easy it is for the bad guys to set their sights on all those vulnerable SNMP devices!

To use gping, we need to give it a range of IP addresses so it can generate an incremental listing We must specify each octet of the IP address separated by a space Since we are going to generate all IP addresses for a class C, we simply tack on 254 at the end of our arguments Thus, the output will create a simple list of IP addresses from 19216811 through 1921681254 We are assuming the class C network has not been subnetted and is using a netmask of 2552552550 Thus, we don t want to include 19216810, the network address, or 1921681255, the broadcast address When possible, try to avoid pinging broadcast addresses, as this activity may result in a denial of service (DoS) condition if many systems respond at once (check out ICMP queries to learn more about discovering a host s netmask) Using gping, we can generate a listing of potential IP addresses that we will use to feed into fping:

Several countermeasures should be employed to mitigate the exposures presented by this vulnerability First, it is always a good idea to disable SNMP on any device that does not explicitly require it To help identify those devices, you can use SNScan, a free tool from Foundstone that can be downloaded from http://wwwfoundstonecom Next, you should ensure that you apply all vendor-related patches and update any firmware that might have used a vulnerable implementation of SNMP For a complete and expansive list, see http://wwwcertorg/advisories/CA-2002-03html In addition, you should always change the default public and private community strings, which are essentially passwords for the SNMP protocol Finally, you should apply network filtering to devices that have SNMP enabled and allow access only from the management station This recommendation is easier said than done, especially in a large enterprise, so your mileage may vary

[tsunami] gping 192 168 1 1 254 19216811 19216812 19216813 19216814 19216815 1921681251 1921681252 1921681253 1921681254

FIGURE 5-12 Metal halide lamp (for base-down mounting)

Now that we have a listing of all the potential IP addresses for our target class C network, we need to feed this to fping so that it can perform a ping sweep and determine which systems are really alive and connected to the network

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

[tsunami]$ gping 192 168 1 1 254 | fping -a 1921681254 is alive 1921681227 is alive 1921681224 is alive 19216813 is alive 19216812 is alive 19216811 is alive 1921681190 is alive

To quote Sun Microsystems, The network is the computer Without a network, a computer s utility diminishes greatly Perhaps that is why the Network File System (NFS) is one of the most popular network-capable file systems available NFS allows transparent access to files and directories of remote systems as if they were stored locally NFS versions 1 and 2 were originally developed by Sun Microsystems and have evolved considerably Currently, NFS version 3 is employed by most modern flavors of UNIX At this point, the red flags should be going up for any system that allows remote access of an exported file system The potential for abusing NFS is high and is one of the more