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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="12.htm">上一层</a>][<a href="478.htm">下一篇</a>]
<hr><p align="left"><small>发信人: cloudsky (晓舟·轩辕明月), 信区: Security <br>
标 题: 关于攻击的讨论(2) <br>
发信站: 武汉白云黄鹤站 (Sat Jan 30 20:41:58 1999) , 站内信件 <br>
<br>
>This oshare.c code may have crashed our Checkpoint Firewall-1, version 3.0b, <br>
>Build Number: 3083. (Sun Sparc, Solaris 2.5.1) <br>
<br>
[snip] <br>
<br>
Little modification in the source. For example... <br>
<br>
---------------------------------------------- <br>
ip->ihl = 22; <br>
ip->frag_off = htons( -16383 ); <br>
---------------------------------------------- <br>
<br>
Compile, and send heaps of packets ('./oshare x.x.x.x 300' for example) to <br>
local Windows 98/NT box. It should freeze (literally) while packets are <br>
travelling. It recovers after the 'attack' is finished (shouldn't be a big <br>
problem to leave a process in the background that will send packets forever). <br>
<br>
This was tested against Windows 98 and Windows NT 4.0 ( 2 Workstations and <br>
1 Server - all with SP4 applied, no post SP4 hotfixes). <br>
<br>
*Please*, don't mail me with "It didn't work for me!" - that's why I post <br>
it here, so people can test & make summaries. Play around with source, you <br>
can get interesting effects (and responses from router :). Don't try to <br>
flood NT boxes outside internal network - packets won't get out (they <br>
didn't for me - others could have different results). <br>
<br>
It will also affect HP-UX (tested against 10.20), but I didn't get more <br>
than "jumping mouse" effect. Load is higher, but machine is functional. <br>
<br>
Linux (2.0.36 and 2.2.0-pre4) was not affected. <br>
<br>
(final note: program was compiled and 'initiated' on linux box w/ <br>
2.2.0-pre4 kernel) <br>
<br>
The cause that it doesn't work well is thought to be here. <br>
<br>
1) A difference in the version of OS. <br>
It works with ja, and it may not work with en. <br>
<br>
2) Modification of the code. <br>
When it was rewritten, my acquaintance's machine crashed a part. <br>
This modification makes the cause of the bug much more vague, <br>
Only, by 100 packet. <br>
<br>
'send_oshare_packet' <br>
ip->ihl = rand() % 16; <br>
ip->tot_len = rand() % 0xffff; <br>
<br>
On Mon, 25 Jan 1999, DEF CON ZERO WINDOW wrote: <br>
<br>
<SNIPPED WHOLE MESSAGE> <br>
tested on a linux 2.2.0-pre9 machine and it's reporting bad packets but <br>
nothing more <br>
<br>
win98 reboots <br>
<br>
<br>
-- <br>
我问飘逝的风：来迟了？ <br>
风感慨：是的，他们已经宣战。 <br>
我问苏醒的大地：还有希望么？ <br>
大地揉了揉眼睛：还有，还有无数代的少年。 <br>
我问长空中的英魂：你们相信？ <br>
英魂带着笑意离去：相信，希望还在。 <br>
</small><hr>
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