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È«¼®¹ü´ÔÀÌ sec-info@cert.certcc.or.kr ÅëÇØ ¾´ ±ÛÀ» ¼öÁ¤¾øÀÌ ±×´ë·Î ¿Å±é´Ï´Ù.
-----------------------------------------------------------------------------
Re: [Áú¹®] TCP/IP ÇÊÅ͸µ ±â´É¿¡¼ FTP °ü·ÃÆ÷Æ®
³¯Â¥: Wed, 4 Sep 2002 12:56:55 +0900
º¸³½ÀÌ: "Sukbum Hong"
¹Þ´ÂÀÌ:
¾È³çÇϽʴϱî?
¿À´Ã°ú³»ÀÏÀÇ È«¼®¹üÀÔ´Ï´Ù.
ftp ¿¡´Â active / passive ÀÌ·¸°Ô µÎ °¡Áö ¸ðµå°¡ Á¸ÀçÇϸç
¶ÇÇÑ °¢°¢ÀÇ ¸ðµå¿¡¼´Â command ¶Ç´Â control Æ÷Æ®¿Í
data Æ÷Æ®¶ó´Â µÎ °³ÀÇ Æ÷Æ®¸¦ ÇÔ²² »ç¿ëÇÕ´Ï´Ù.
active ¸ðµå¿¡¼´Â command Æ÷Æ®·Î¼ 21¹øÀ»,
data Æ÷Æ®·Î¼ 20¹øÀ» »ç¿ëÇϸç
passive ¸ðµå¿¡¼´Â command Æ÷Æ®·Î¼ 21¹øÀ»,
data Æ÷Æ®·Î 1024 ÀÌÈÄÀÇ ÀÓÀÇÀÇ ºñƯ±ÇÆ÷Æ®¸¦ »ç¿ëÇÕ´Ï´Ù.
µû¶ó¼ active ¸ðµå·ÎÀÇ ftp ¸¦ Çã¿ëÇÏ·Á¸é 21¹ø ¿Ü¿¡ data Æ÷Æ®ÀÎ
20¹øµµ ÇÔ²² Çã¿ëÇÏ¿©¾ß ÇÏ¸ç ¸¸¾à data Æ÷Æ®ÀÎ 20¹øÀ» Çã¿ëÇÏÁö ¾ÊÀ» °æ¿ì¿¡´Â
¸»¾¸ÇϽŠ¹Ù¿Í °°Àº Çö»óÀÌ ¹ß»ýÇÏ°Ô µË´Ï´Ù.
¶ÇÇÑ 20¹øÀ» Ãß°¡·Î Çã¿ëÇÏ¿´´Ù ÇÏ´õ¶óµµ Ŭ¶óÀ̾ðÆ®ÂÊ¿¡¼ passive ¸ðµå·Î
ftp ¸¦ Á¢¼ÓÇÒ °æ¿ì ¿ª½Ã data Æ÷Æ®°¡ ¿·ÁÀÖÁö ¾ÊÀ¸¹Ç·Î °°Àº Çö»óÀÌ
³ªÅ¸³ª°Ô µÉ °ÍÀÔ´Ï´Ù.
Ãß°¡ÀûÀ¸·Î ÁÖÀÇÇÒ Á¡Àº active ¸ðµåÀÇ ÀÛµ¿ ¹æ½ÄÀÔ´Ï´Ù.
µÎ°³ÀÇ Æ÷Æ®¸¦ »ç¿ëÇÑ´Ù´Â ¿¹¿Ü»óȲ ¿Ü¿¡µµ ¾Æ·¡¿Í °°ÀÌ
active ¸ðµå¿¡¼´Â µÎ¹ø° Æ÷Æ®°¡ ÀÛµ¿ÇÒ ¶§ ÀϹÝÀûÀÎ
tcp/ip 3 way handshake ¹æ½ÄÀÌ ¾Æ´Ñ ´Ù¸¥ ¿¹¿Ü¹æ½ÄÀ¸·Î ÀÛµ¿ÇÏ°Ô µÈ´Ù´Â °ÍÀÔ´Ï´Ù.
°¢±â ¸ðµåÀÇ ÀÛµ¿ ¹æ½ÄÀ» ±×¸²À¸·Î º¸½Ã¸é ÀÌÇØÇϱⰡ ½¬¿ì½Ç °ÍÀÔ´Ï´Ù.
* ( ) ¾ÈÀÇ ¼ýÀÚ´Â ÀÛµ¿ÇÏ´Â Æ÷Æ®¸¦ ¶æÇÕ´Ï´Ù.
* È»ìÇ¥ ¹æÇâÀº ÆÐŶÀÇ À̵¿¹æÇâÀ» ¶æÇÕ´Ï´Ù.
## Active FTP
Client(1025) ---> Server (21)
Client(1025) <--- Server (21)
Client(1026) <--- Server (20)
Client(1026) ---> Server (20)
## Passive FTP
Client(1025) ---> Server (21)
Client(1025) <--- Server (21)
Client(1026) ---> Server (1028)
Client(1026) <--- Server (1028)
Âü°íÇϽñ⠹ٶø´Ï´Ù.
°¨»çÇÕ´Ï´Ù.
----- Original Message -----
From: webmaster
To: sec-info@cert.certcc.or.kr
Sent: Tuesday, September 03, 2002 11:57 AM
Subject: [Áú¹®] TCP/IP ÇÊÅ͸µ ±â´É¿¡¼ FTP °ü·ÃÆ÷Æ®
windows 2000 server sp2 ¿¡¼ À¥¼¹ö, FTP¼¹ö, ¸ÞÀϼ¹ö,
³×ÀÓ¼¹ö¸¦ ÇÔ²² »ç¿ëÁßÀÔ´Ï´Ù.
TCP/IP ÇÊÅ͸µ ±â´ÉÀ» ÀÌ¿ëÇؼ ÃÖ¼ÒÇÑÀÇ Æ÷Æ®¸¸ Çã¿ëÇÏ°íÀÚ
´ÙÀ½°ú °°ÀÌ ¼³Á¤Çß½À´Ï´Ù.
TCPÆ÷Æ® UDPÆ÷Æ® IPÆ÷Æ®
--------------------------------------
21 Çã¿ë ¸ðµÎÇã¿ë 6 Çã¿ë
25 Çã¿ë
53 Çã¿ë
80 Çã¿ë
110 Çã¿ë
--------------------------------------
´Ù¸¥ ¼ºñ½º´Â ÀÌ»óÀÌ ¾ø´Âµ¥, FTP¿¡ ¹®Á¦°¡ ÀÖ½À´Ï´Ù.
FTP·Î Á¢¼ÓÀº Àß µÇ´Âµ¥, ¾Æ·¡¿Í °°ÀÌ ¿¡·¯°¡ ³ª°í,
ÆÄÀÏ ¸®½ºÆ®°¡ ¾ÈµË´Ï´Ù. µð·ºÅ丮 üÀÎÁö, µð·ºÅ丮 ¸¸µé±â µîµµ ¾ÈµË´Ï´Ù.
--------------- Cuted FTP¿¡¼ÀÇ ·Î±× ---
COMMAND:> LIST
STATUS:> Connecting data socket...
ERROR:> Failed to establish data socket
425 Can't open data connection.
ERROR:> File error
---------------------------------------
Çؼ... TCPÆ÷Æ®¸¦ "¸ðµÎÇã¿ë"À¸·Î Çß´õ´Ï¸¸ ¿¡·¯¾øÀÌ Àß µË´Ï´Ù.
21¹ø Æ÷Æ®¸¸ Çã¿ëÇϸé FTP µ¹¸®´Âµ¥ ¹®Á¦°¡ ¾øÀ» ÁÙ ¾Ë¾Ò´Âµ¥
¶Ç Ãß°¡ÇؾßÇÒ Æ÷Æ®°¡ ÀÖ´Â °Ç°¡¿ä?
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