DNS��� 愿��젴�맂 沅곴툑�븳 �젏�뱾�쓣 吏덈Ц�빐 二쇱꽭�슂. �떞�떦�옄媛� 利됱떆 �떟蹂��빐 �뱶由ш쿋�뒿�땲�떎. ��� DNS��� 愿��젴�맂 �궡�슜�씠 �븘�땺 寃쎌슦 �궘�젣�맆 �닔 �엳�뒿�땲�떎.
제 목
RE : cache poisoning ??
글쓴이
蹂��긽泥�
조회
3588
게시일자
2009-03-31 �삤�썑 2:28:30
cache poisoning �씠��� 臾댁뾿�엯�땲源�?
DNS �봽濡쒗넗肄� �옄泥댁쓽 痍⑥빟�꽦�쑝濡� 罹먯떆 DNS�뿉 ����옣�맂 荑쇰━ �젙蹂닿�� �쐞, 蹂�議곕릺�뒗 寃껋쓣 留먰빀�땲�떎. 利�, dns server�궡�쓽 罹먯돩湲곕뒫�뿉 �옒紐삳맂 DNS �젙蹂대�� �쓽�젮 蹂대궡 �젙�긽�쟻�씤 �궗�씠�듃瑜� �떎瑜� �궗�씠�듃�쓽 ip濡� 蹂�議곗떆�궎�뒗 諛⑸쾿�엯�땲�떎.
諛쒖깮�썝�씤
�몺 蹂� 痍⑥빟�젏��� DNS�뿉�꽌 DNS transaction ID��� source port number瑜� 遺��뿬�븷 �븣,
�삁�긽�븯湲� �돩�슫 �엫�쓽�쓽 媛믪쓣 �깮�꽦�븯湲� �븣臾몄뿉 諛쒖깮�븿
�몼 �빐�떦 �떊洹� 痍⑥빟�젏�뱾��� 湲곗〈 �븣�젮吏� �궡�슜�쓣 湲곕컲�쑝濡� �슚�쑉�쟻�씤 怨듦꺽�씠 媛��뒫�븯�룄濡� �븿
�쁺�뼢
�몺 怨듦꺽�옄�뒗 �빐�떦 痍⑥빟�젏�쓣 �씠�슜�븯�뿬 DNS 荑쇰━ �젙蹂대�� 蹂�寃쏀븷 �닔 �엳�쓬
�몼 怨듦꺽 �꽦怨� �떆, DNS 荑쇰━ �뜲�씠�꽣 蹂�寃�, �궘�젣 �벑�쓽 �옉�뾽 媛��뒫 (�뵾�떛, �븙�꽦肄붾뱶 �쑀�룷�벑�뿉
�븙�슜�맆 �닔 �엳�쓬)
痍⑥빟�젏 �솗�씤 諛⑸쾿
�몺 �떎�쓬 紐낅졊 �떎�뻾
$ dig @aaa.bbb.ccc.ddd +short porttest.dns-oarc.net TXT
�몼 痍⑥빟�븳 寃쎌슦 �쓳�떟 �궡�슜
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"
�몾 �젙�긽 DNS �솗�씤 寃곌낵
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"
�빐寃곕갑�븞���
�몺 Upgrade
罹먯떆/由ъ「鍮� DNS �꽌踰꾨줈 �궗�슜�릺�뒗 �떆�뒪�뀥�쓣 �슫�쁺 以묒씠�씪硫�, �빐�떦 蹂댁븞 痍⑥빟�젏�뿉
���鍮꾪븯怨�, �떆�뒪�뀥 �꽦�뒫 �뼢�긽�쓣 �쐞�븯�뿬 媛� 踰ㅻ뜑�궗�쓽 痍⑥빟�젏�씠 �뙣移섎맂 理쒖떊踰꾩쟾
Bind濡� Upgrade
�몼 �뙣移섍�� �맂 踰꾩쟾
BIND 9.3.5-p1, BIND 9.4.2-p1, BIND 9.5.0-p1
�몾 �뙣移섍�� �뼱�젮�슱 寃쎌슦
- �떊猶고븷 �닔 �엳�뒗 �샇�뒪�듃�뿉 ����빐�꽌留� recursive query�뿉 ����븳 �쓳�떟�씠 媛��뒫�븯�룄濡�
�꽕�젙�븷 寃껋쓣 沅뚭퀬
- Recursion 湲곕뒫�씠 �븘�슂�븯吏� �븡�쓣 寃쎌슦, Disable(鍮꾪솢�꽦�솕)�떆�궗 寃껋쓣 沅뚭퀬
- 蹂댁븞 �옣鍮�(諛⑺솕踰�, 移⑥엯�깘吏��떆�뒪�뀥, 移⑥엯諛⑹���떆�뒪�뀥 �벑), �꽕�듃�썙�겕 �옣鍮� �벑�뿉�꽌
- DNS �꽌鍮꾩뒪瑜� �궗�슜 以묒씠�씪硫�, 鍮꾪솢�꽦�솕(disable) �떆�궗 寃껋쓣 沅뚭퀬
- �듅�엳 BIND�뒗 諛⑺솕踰쎄낵 �씪�슦�꽣�뿉�꽌 DNS �꽌鍮꾩뒪濡� �옄二� �궗�슜�릺湲� �븣臾몄뿉, 留뚯씪
�븘�슂濡� �븯吏� �븡�뒗 �꽌鍮꾩뒪�씪硫�, 鍮꾪솢�꽦�솕 �떆�궗 寃껋쓣 沅뚭퀬
�몿 �빐�떦 痍⑥빟�젏��� 罹먯떆/由ъ「鍮숈쓣 �븯吏� �븡�뒗 DNS�뿉�뒗 �쁺�뼢�쓣 二쇱�� �븡�쓬
Upgrade 吏��썝 �븞�궡
�몺 �꽬�뵾�븘�뿉�꽌�뒗 洹� �룞�븞 異뺤쟻�맂 湲곗닠怨� 二쇱슂湲곗뾽 �벑�뿉�꽌 寃�利앸맂 DNS而⑥꽕�똿 �꽌鍮꾩뒪瑜�
諛뷀깢�쑝濡� 洹��궗�뿉 �씠踰� DNS cache poisoning �뾽洹몃젅�씠�뱶 諛� DNS 愿��젴 湲곗닠�쟻�씤
吏��썝�쓣 �젣怨듯빐 �뱶由쎈땲�떎.
�몼 �뾽洹몃젅�씠�뱶�뒗 �썝寃⑹���썝, 諛⑸Ц 吏��썝�씠 �엳�쑝硫� �떊泥��닚�꽌�뿉 �뵲�씪 �닚李⑥쟻�쑝濡� 吏��썝�빐
�뱶由쎈땲�떎.
=========================== �썝蹂멸�� ===========================
DNS瑜� 怨듬���븯�떎 蹂대땲 "cache poisoning" �씠�씪�뒗 留먯씠 �굹�삤�뜕�뜲..
cache poisoning 萸먭���슂??
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