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CISCO IOSÀÇ ¹öÀü Á¤º¸¿¡ µû¸£¸é ÇØ´ç ¼ÒÇÁÆ®¿þ¾î¿¡´Â TCP establishment ´Ü°è¿¡¼ DoS Ãë¾àÁ¡ÀÌ Á¸ÀçÇÑ´Ù. TCP ¿¬°áÀÇ ³²¾ÆÀÖ´Â SYNRCVD or SYNSENT »óÅ°¡ ½Ã½ºÅÛ ÀÚ¿øÀ» °í°¥½ÃÄÑ »õ·Î¿î TCP ¿¬°áÀ» ¹æÇØÇÑ´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. ±×¸®°í ¶ÇÇÑ, IPv6°¡ »ç¿ë ÁßÁö µÇ¾î ÀÖ´Ù¸é ÀÌ Ãë¾àÁ¡Àº Àû¿ëµÇÁö ¾Ê´Â´Ù. ¸¸¾à SGBP°¡ »ç¿ë ÁßÁöµÇ¾î ÀÖ´Ù¸é ÀÌ Ãë¾àÁ¡Àº ¹«½ÃÇÑ´Ù.
* Âü°í »çÀÌÆ®: http://www.cisco.com/warp/public/707/cisco-sa-20100812-tcp.shtml http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4095e.shtml
* ¿µÇâÀ» ¹Þ´Â Ç÷§Æû: Cisco IOS 15.1(2)T ¹öÀü |
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´ÙÀ½ Cisco º¸¾È ±Ç°í¾È(IOS Software TCP Denial of Service Vulnerability)ÀÇ ""Software Versions and Fixes"" ¸¦ ÂüÁ¶ÇÏ¿© ¹®Á¦°¡ ÇØ°áµÈ ¹öÀüÀ¸·Î ¾÷±×·¹À̵å ÇÏ¿©¾ß ÇÑ´Ù: http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4095e.shtml
¾÷±×·¹À̵åµéÀº Cisco À¥ »çÀÌÆ®ÀÎ http://www.cisco.com ¿¡ ÀÖ´Â Software Center¸¦ ÅëÇØ ±¸ÇÒ ¼ö ÀÖ´Ù. |
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