Fore/Marconi ATM Switch 'land' vulnerability

["Seeker of Truth" <seeker_sojourn () hotmail com>]

System Versions FT6.1.1 and FT7.0.1

Labratory testing indicates that a single 'land' packet sent to the telnet 
port (23) of
either the inband or out-of-band interface will cause the device to stop 
responding to
ip traffic. Over the  course of 6-1/2 minutes, all CPU will be consumed and  
device reboots.

Basically a packet is forged with the source and destination IP address and 
ports identical.

We reproduced it using Internet Security Scanner 6.01 and the 'land' and 
'ciscoland' tests.
Many sources and derivatives are available on public security websites.

It's a TCP/IP stack bug that's been known since 1997. Here are some links

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0016
http://www.cert.org/advisories/CA-1997-28.html
http://www.securityfocus.com/frames/?content=/templates/archive.pike%3Flist%3D1%26mid%3D8081

Vendor notified one year ago today :-)

-oo-
seeker

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