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±Û º»¹® Áß°£¿¡ ¾÷·ÎµåÇÒ À̹ÌÁö¸¦ Ãß°¡ÇÏ´Â ¹æ¹ý : @@À̹ÌÁöÀ̸§@@
ex) @@foo.gif@@
68 ¹ø ±Û: [SE] icmp_redirect
±Û¾´ÀÌ: »êÀÌ [ȨÆäÀÌÁö] ±Û¾´³¯: 2003³â 11¿ù 05ÀÏ 09:15:48 ¼ö(¿ÀÀü) Á¶È¸: 5942
¾È³çÇϽʴϱî? ¿À´Ã°ú³»ÀÏÀÇ È«¼®¹üÀÔ´Ï´Ù.

¾ð±ÞÇϽŠ·Î±×´Â icmp_redirect ¿Í °ü·ÃµÈ ¸Þ½ÃÁöÀε¥,
icmp_redirect ´Â ¶ó¿ìÅÍ°¡ È£½ºÆ®¿¡°Ô ÃÖÀûÈ­µÈ °æ·Î¸¦ ¾Ë·ÁÁÖ´Â
¿ëµµ·Î »ç¿ëµË´Ï´Ù. ±×·¯³ª, ÀÌ ±â´ÉÀÌ À߸ø »ç¿ëµÇ¾î °ø°ÝÀÚ°¡
icmp_redirect ÆÐŶÀ» À§Á¶ÇÒ °æ¿ì ½Ã½ºÅÛÀÇ ¶ó¿ìÆà Å×À̺íÀ» ¼öÁ¤ÇÏ¿©
ƯÁ¤ Æ®·¡ÇÈÀÇ °æ·Î¸¦ ¼öÁ¤ÇÒ ¼ö ÀÖ´Â À§ÇèÀÌ ÀÖ½À´Ï´Ù.
µû¶ó¼­, Á¤»óÀûÀÎ »óȲ¿¡¼­´Â ¾Æ·¡¿Í °°ÀÌ ¼­¹öÀÇ interface ¿¡¼­
icmp_redirect kernel parameter ¸¦ off ÇÏ½Ç °ÍÀ» ±ÇÀåÇÕ´Ï´Ù.
Âü°í·Î, ¼³Á¤º¯°æÀº echo ³ª sysctl ·Î ÇÏ½Ã¸é µÇ¸ç
0Àº off, 1 Àº on À» ÀǹÌÇÕ´Ï´Ù.

net.ipv4.conf.eth0.accept_redirects = 0
net.ipv4.conf.lo.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.accept_redirects = 0

¸Þ½ÃÁö¿Í °ü·ÃµÈ ¼Ò½º´Â ¾Æ·¡ ÆÄÀÏÀ» Âü°íÇϽñ⠹ٶø´Ï´Ù.

/usr/src/linux/net/ipv4/route.c

reject_redirect:
#ifdef CONFIG_IP_ROUTE_VERBOSE
        if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
                printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about "
                        "%u.%u.%u.%u ignored.\n"
                        "  Advised path = %u.%u.%u.%u -> %u.%u.%u.%u, "
                        "tos %02x\n",
                       NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw),
                       NIPQUAD(saddr), NIPQUAD(daddr), tos);
#endif

man ÆäÀÌÁö¸¦ º¸¸é route ¶Ç´Â netstat -nr ·Î È®Àνà Flags °¡

D ÀÎ °æ¿ì icmp_redirect ·Î ¶ó¿ìÆà ¸ñ·ÏÀÌ »õ·Ó°Ô »ý¼ºµÇ¾úÀ¸¸ç
M ÀÎ °æ¿ì ¶ó¿ìÆà °æ·Î°¡ º¯°æµÇ¾úÀ½À» ÀǹÌÇÑ´Ù°í ÇÕ´Ï´Ù.

Âü°íÇϽñ⠹ٶø´Ï´Ù.



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----- Original Message ----- 
From: "Security" <vraptor6@YAHOO.CO.KR>
To: <sec-info@cert.certcc.or.kr>
Sent: Tuesday, November 04, 2003 9:51 AM
Subject: message logÀε¥ ¹«½¼¶æÀÎÁö..


JAA26334
Sender: owner-sec-info@firebird.certcc.or.kr
Precedence: bulk

¼ö°íÇϽʴϴÙ.

¿©±â ¸ÞÀϸµ¸®½ºÆ®¿¡¼­ ¸¹Àº µµ¿òÀ» ¹Þ°í À־ °í¸¿°Ô »ý°¢ÇÏ°í ÀÖ½À´Ï´Ù.

Áú¹®ÀÌ À־ ¹®ÀÇ µå¸³´Ï´Ù.

¾Æ·¡ ¸Þ¼¼Áö´Â /var/log/message ¿¡ ³²¾ÆÀÖ´Â ³»¿ëÀÔ´Ï´Ù. ÀÌ ¸Þ¼¼ÁöÀÇ ÀǹÌ
°¡ ¹«¾ùÀÎÁö ¸ð¸£°Ú³×¿ä..

À¯Áî³ÝÀ» µÚÁ®ºÁµµ ³»¿ëÀÌ ¾È³ª¿Í¼­ ¹®Àǵ帳´Ï´Ù. ¸¹Àº µµ¿ò ºÎŹµå¸³´Ï´Ù.

ÇöÀç ½Ã½ºÅÛ : ÇÑÄÄ ¸®´ª½º 3.1 ftp¹öÁ¯
¾Æ·¡´Â ¸Þ¼¼Áö³»¿ëÀÌ°í 61.111.201.XXXÀº Á¦°¡ »ç¿ëÁßÀÎ ½Ã½ºÅÛÀÔ´Ï´Ù.
---------------------------------------------------------------------
Redirect from 211.212.29.aaa on eth0 about 211.212.29.bbb ignored.
  Advised path = 61.111.201.XXX -> 211.212.29.bbb, tos 00
Redirect from 211.212.29.aaa on eth0 about 211.212.29.bbb ignored.
  Advised path = 61.111.201.XXX -> 211.212.29.bbb, tos 00
----------------------------------------------------------------------




   ---------------------------------------------------------
     sec-info Mailing list Å»Å𸦠¿øÇϽôºÐÀº ¸Þ½ÃÁö º»¹®¿¡
     ´ÙÀ½°ú °°ÀÌ ¾²½ÅÈÄ <Majordomo@certcc.or.kr>·Î ¸ÞÀÏÀ»
     º¸³» ÁÖ½Ã¸é µË´Ï´Ù.

           unsubscribe sec-info your-mail-address
   ---------------------------------------------------------

   ---------------------------------------------------------
     sec-info Mailing list Å»Å𸦠¿øÇϽôºÐÀº ¸Þ½ÃÁö º»¹®¿¡
     ´ÙÀ½°ú °°ÀÌ ¾²½ÅÈÄ <Majordomo@certcc.or.kr>·Î ¸ÞÀÏÀ»
     º¸³» ÁÖ½Ã¸é µË´Ï´Ù.

           unsubscribe sec-info your-mail-address
   ---------------------------------------------------------

 
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