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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center">               ● UNIX网络编程                       (BM: clown)                </font></big></big></td></tr>
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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="477.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(1) <br>

发信站: 武汉白云黄鹤站 (Sat Jan 30 20:39:39 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>

After running it I lost internet connectivity and saw <br>

the following on the console of our firewall server: <br>

  <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

FW-1: packet size too big (131060) from 0x01010101, ip_p=17 <br>

  <br>

The machine could not be soft booted and need to be hard booted <br>



(power cycled) <br>

  <br>

I will not (or cannot) try and duplicate this, since I can't afford <br>

to crash our firewall again :) <br>

  <br>

To give a brief network sketch: <br>

  <br>

Linux Box (running oshare) -> Router -- Frame Relay -> Router <br>

 -> Firewall-1 machine -> Dest Win98 box <br>

  <br>

I cannot confirm that this program crashed our firewall, but I would say <br>

it's a safe bet. <br>

  <br>

I'm no C programmer, but I think this part here is the guilty part: <br>

(Line 65 or so) <br>

  <br>

        ip->frag_off    = htons( 16383 ); <br>

        ip->ttl         = 0xff; <br>

        ip->protocol    = IPPROTO_UDP; <br>

        ip->saddr       = htonl( inet_addr( "1.1.1.1" ) ); <br>

        ip->daddr       = dst_addr; <br>

        ip->check       = in_cksum( ( u_short *)ip, 44 ); <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>

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