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Ãë¾àÁ¡ID 29123
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»ó¼¼¼³¸í CISCO IOSÀÇ ¹öÀü Á¤º¸¿¡ µû¸£¸é ÇØ´ç ¼ÒÇÁÆ®¿þ¾î¿¡´Â Á¶ÀÛµÈ BGP ÆÐŶ¿¡ ÀÇÇÑ ¼­ºñ½º °ÅºÎ Ãë¾àÁ¡ÀÌ Á¸ÀçÇÑ´Ù(CISCO ¹ö±× ID CSCee67450). BGP(Border Gateway Protocol)´Â RFC 1771¿¡ Á¤ÀÇµÈ ¶ó¿ìÆà ÇÁ·ÎÅäÄÝ·Î ´ë±Ô¸ð ³×Æ®¿öÅ©µé¿¡¼­ IP ¶ó¿ìÆÃÀ» °ü¸®Çϱâ À§ÇØ °í¾ÈµÇ¾ú´Ù. CISCO IOSÀÇ 9.x, 10.x, 11.x, 12.x¿Í XR ¹öÀüµéÀº "bgp log-neighbor-changes" ¿É¼ÇÀÌ ¼³Á¤µÇ¾î ÀÖ´Â »óȲ¿¡¼­ ¾ÇÀÇÀûÀÎ BGP ÆÐŶµéÀ» ó¸®ÇÒ ¶§ ¿ø°ÝÁöÀÇ °ø°ÝÀÚ°¡ ÀÓÀÇÀÇ Äڵ带 ½ÇÇà½ÃÅ°°Å³ª ¼­ºñ½º °ÅºÎ¸¦ ÀÏÀ¸Å°°Ô ÇØ ÁÙ ¼ö ÀÖ´Ù. ÀÌ ¿É¼ÇÀÌ µðÆúÆ®·Î´Â ¼³Á¤µÇ¾î ÀÖÁö ¾Ê´õ¶óµµ ³×Æ®¿öÅ© ¹®Á¦µéÀ» Áø´ÜÇϱâ À§ÇÏ¿© ¼öµ¿À¸·Î ÀÌ ¿É¼ÇÀ» ¼³Á¤ÇÏ´Â ¼­ºñ½º Á¦°øÀڵ鵵 ¸¶Âù°¡Áö È¿°ú¸¦ ¹ÌÄ£´Ù. ÀÌ Ãë¾àÁ¡À» µµ¿ëÇϱâ À§Çؼ­ °ø°ÝÀÚ´Â ¾Ë·ÁÁø BGP »ó´ë¸¦ ħÀÔÇϰųª ¿¬°áµÇ¾î ÀÖ´Â ½ºÆ®¸²¿¡ Æ®·¡ÇÈÀ» ³¢¿ö ³ÖÀ» ¼ö ÀÖ¾î¾ß ÇÑ´Ù. ¿ø°ÝÁöÀÇ °ø°ÝÀÚ´Â ÀÌ Ãë¾àÁ¡À» µµ¿ëÇÏ¿© ¿µÇâÀ» ¹Þ´Â Àåºñ¿¡ ´ëÇÑ ¿ÏÀüÇÑ Á¦¾î±ÇÀ» ¾ò°Å³ª Àåºñ¸¦ Àç½ÃÀÛ½Ãų ¼ö ÀÖ´Ù.

* ¾Ë¸²: ÀÌ Á¡°ËÇ׸ñÀº ÀÌ Ãë¾àÁ¡À» Á¡°ËÇϱâ À§ÇØ ÇØ´ç ½Ã½ºÅÛÀÇ ¹öÀüÁ¤º¸¸¸À» È®ÀÎÇÑ´Ù. µû¶ó¼­ °ÅÁþ ¾ç¼º¹ÝÀÀ(False Positive)À» º¸ÀÏ ¼ö ÀÖ´Ù. ÀÌ Á¡°ËÇ׸ñÀº ¶ÇÇÑ ¹öÀüÁ¤º¸¸¦ ¼öÁýÇϱâ À§ÇÏ¿© Àб⠱ÇÇÑÀÇ SNMP Community ¹®ÀÚ¿­À» ÇÊ¿ä·Î ÇÑ´Ù. À̸¦ À§Çؼ­´Â Á¤Ã¥ ÆíÁý±â¿¡¼­ Á¡°ËÇ׸ñ "snmp/guessable/r"¿¡ Ÿ´çÇÑ Community ¹®ÀÚ¿­À» Ãß°¡ÇÏ¿©¾ß ÇÑ´Ù. ¸¸¾à BGP°¡ »ç¿ë ÁßÁöµÇ¾î ÀÖ´Ù¸é ÀÌ Ãë¾àÁ¡Àº ¹«½ÃÇÑ´Ù.

* Âü°í »çÀÌÆ®:
http://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml
http://xforce.iss.net/xforce/alerts/id/185
http://www.kb.cert.org/vuls/id/689326
http://www.us-cert.gov/cas/techalerts/TA05-026A.html
http://securitytracker.com/alerts/2005/Jan/1013013.html
http://www.cisco.com/en/US/products/products_security_advisory09186a00803be7d9.shtml

* ¿µÇâÀ» ¹Þ´Â Ç÷§Æû:
Cisco IOS 9.x, 10.x, 11.x, 12.x and XR ¹öÀüµé
ÇØ°áÃ¥ ´ÙÀ½ Cisco º¸¾È ±Ç°í¾È(Cisco IOS Misformed BGP Packet Causes Reload)ÀÇ "Software Versions and Fixes" ¸¦ ÂüÁ¶ÇÏ¿© ¹®Á¦°¡ ÇØ°áµÈ ¹öÀüÀ¸·Î ¾÷±×·¹À̵å ÇÏ¿©¾ß ÇÑ´Ù:
http://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml

¾÷±×·¹À̵åµéÀº Cisco À¥ »çÀÌÆ®ÀÎ http://www.cisco.com ¿¡ ÀÖ´Â Software Center¸¦ ÅëÇØ ±¸ÇÒ ¼ö ÀÖ´Ù.
°ü·Ã URL CVE-2005-0196 (CVE)
°ü·Ã URL 12370 (SecurityFocus)
°ü·Ã URL 19074 (ISS)