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Á¦ ¸ñ  RE : cache poisoning ??
±Û¾´ÀÌ   º¯»óö Á¶È¸ 3220
°Ô½ÃÀÏÀÚ   2009-03-31 ¿ÀÈÄ 2:28:30
 
cache poisoning À̶õ ¹«¾ùÀԴϱî?
DNS ÇÁ·ÎÅäÄÝ ÀÚüÀÇ Ãë¾à¼ºÀ¸·Î ij½Ã DNS¿¡ ÀúÀåµÈ Äõ¸® Á¤º¸°¡ À§, º¯Á¶µÇ´Â °ÍÀ» ¸»ÇÕ´Ï´Ù. Áï, dns server³»ÀÇ Ä³½¬±â´É¿¡ À߸øµÈ DNS Á¤º¸¸¦ Èê·Á º¸³» Á¤»óÀûÀÎ »çÀÌÆ®¸¦ ´Ù¸¥ »çÀÌÆ®ÀÇ ip·Î º¯Á¶½ÃÅ°´Â ¹æ¹ýÀÔ´Ï´Ù.
¹ß»ý¿øÀÎ
¨ç º» Ãë¾àÁ¡Àº DNS¿¡¼­ DNS transaction ID¿Í source port number¸¦ ºÎ¿©ÇÒ ¶§,
¿¹»óÇϱ⠽¬¿î ÀÓÀÇÀÇ °ªÀ» »ý¼ºÇϱ⠶§¹®¿¡ ¹ß»ýÇÔ
¨è ÇØ´ç ½Å±Ô Ãë¾àÁ¡µéÀº ±âÁ¸ ¾Ë·ÁÁø ³»¿ëÀ» ±â¹ÝÀ¸·Î È¿À²ÀûÀÎ °ø°ÝÀÌ °¡´ÉÇϵµ·Ï ÇÔ
¿µÇâ
¨ç °ø°ÝÀÚ´Â ÇØ´ç Ãë¾àÁ¡À» ÀÌ¿ëÇÏ¿© DNS Äõ¸® Á¤º¸¸¦ º¯°æÇÒ ¼ö ÀÖÀ½
¨è °ø°Ý ¼º°ø ½Ã, DNS Äõ¸® µ¥ÀÌÅÍ º¯°æ, »èÁ¦ µîÀÇ ÀÛ¾÷ °¡´É (ÇǽÌ, ¾Ç¼ºÄÚµå À¯Æ÷µî¿¡
¾Ç¿ëµÉ ¼ö ÀÖÀ½)
Ãë¾àÁ¡ È®ÀÎ ¹æ¹ý
¨ç ´ÙÀ½ ¸í·É ½ÇÇà
$ dig @aaa.bbb.ccc.ddd +short porttest.dns-oarc.net TXT
¨è Ãë¾àÇÑ °æ¿ì ÀÀ´ä ³»¿ë
z.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.net. "aaa.bbb.ccc.ddd
is POOR: 26 queries in 4.0 seconds from 1 ports with std dev 0.00"

¨é Á¤»ó DNS È®ÀÎ °á°ú
z.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.net.
"IP-of-GOOD is GOOD: 26 queries in 2.0 seconds from 26 ports with std
dev 17685.51"

ÇØ°á¹æ¾ÈÀº
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Bind·Î Upgrade
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BIND 9.3.5-p1, BIND 9.4.2-p1, BIND 9.5.0-p1
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- º¸¾È Àåºñ(¹æÈ­º®, ħÀÔŽÁö½Ã½ºÅÛ, ħÀÔ¹æÁö½Ã½ºÅÛ µî), ³×Æ®¿öÅ© Àåºñ µî¿¡¼­
- DNS ¼­ºñ½º¸¦ »ç¿ë ÁßÀ̶ó¸é, ºñÈ°¼ºÈ­(disable) ½Ãų °ÍÀ» ±Ç°í
- ƯÈ÷ BIND´Â ¹æÈ­º®°ú ¶ó¿ìÅÍ¿¡¼­ DNS ¼­ºñ½º·Î ÀÚÁÖ »ç¿ëµÇ±â ¶§¹®¿¡, ¸¸ÀÏ
ÇÊ¿ä·Î ÇÏÁö ¾Ê´Â ¼­ºñ½º¶ó¸é, ºñÈ°¼ºÈ­ ½Ãų °ÍÀ» ±Ç°í
¨ê ÇØ´ç Ãë¾àÁ¡Àº ij½Ã/¸®Á¹ºùÀ» ÇÏÁö ¾Ê´Â DNS¿¡´Â ¿µÇâÀ» ÁÖÁö ¾ÊÀ½
Upgrade Áö¿ø ¾È³»
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¹ÙÅÁÀ¸·Î ±Í»ç¿¡ À̹ø DNS cache poisoning ¾÷±×·¹ÀÌµå ¹× DNS °ü·Ã ±â¼úÀûÀÎ
Áö¿øÀ» Á¦°øÇØ µå¸³´Ï´Ù.
¨è ¾÷±×·¹À̵å´Â ¿ø°ÝÁö¿ø, ¹æ¹® Áö¿øÀÌ ÀÖÀ¸¸ç ½Åû¼ø¼­¿¡ µû¶ó ¼øÂ÷ÀûÀ¸·Î Áö¿øÇØ
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=========================== ¿øº»±Û ===========================
DNS¸¦ °øºÎÇÏ´Ù º¸´Ï "cache poisoning" À̶ó´Â ¸»ÀÌ ³ª¿À´øµ¥..
cache poisoning ¹¹°¡¿ä??
 
 

   cache poisoning ??  2009-03-30 ij½Ã¸®
       RE : cache poisoning ??  2009-03-31 º¯»óö
       RE : cache poisoning ??  2009-03-31 ¼ÛÁ¾¼ö

 
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