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ÇÁ·ÎÅäÄÝ TCP
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»ó¼¼¼³¸í ¿ø°Ý ½Ã½ºÅÛ¿¡´Â kernel security updateÀÎ CESA-2019:1481ÀÌ ÆÐÄ¡µÇ¾î ÀÖÁö ¾Ê´Ù. ÆÐÄ¡ Àü kernel¿¡´Â ´ÙÀ½°ú °°Àº Ãë¾àÁ¡ÀÌ Á¸ÀçÇÑ´Ù.

- TCP Selective Acknowledgment(SACK)¸¦ ó¸®ÇÒ ¶§ ¸®´ª½º Ä¿³Î¿¡¼­ Á¤¼ö ±â¹ÝÀÇ ¿À¹öÇ÷ο찡 ¹ß»ýÇÑ´Ù. ÀÌ·Î ÀÎÇØ ¼­ºñ½º °ÅºÎ°¡ ¹ß»ýÇÒ ¼ö ÀÖ´Ù. (CVE-2019-11477)

- TCP Selective Acknowledgment(SACK) ºí·ÏÀ» ó¸®ÇÒ ¶§ ¸®¼Ò½º¸¦ °ú´ÙÇÏ°Ô »ç¿ëÇÑ´Ù. ÀÌ·Î ÀÎÇØ ¼­ºñ½º °ÅºÎ°¡ ¹ß»ýÇÒ ¼ö ÀÖ´Ù. (CVE-2019-11478)

- MSS TCP Ä¿³Ø¼ÇÀ» ¸ÎÀ» ¶§ ¸®¼Ò½º¸¦ °ú´ÙÇÏ°Ô »ç¿ëÇÑ´Ù. ÀÌ·Î ÀÎÇØ ¼­ºñ½º °ÅºÎ°¡ ¹ß»ýÇÒ ¼ö ÀÖ´Ù. (CVE-2019-11479)

* Âü°í »çÀÌÆ®:
https://lists.centos.org/pipermail/centos-announce/2019-June/023333.html

* ¾Ë¸²: ÀÌ Á¡°ËÇ׸ñÀº ÀÌ Ãë¾àÁ¡À» Á¡°ËÇϱâ À§ÇØ ÇØ´ç ¿ø°ÝÁö ¼­¹öÀÇ kernel RPM ¹öÀü Á¤º¸¸¸À» È®ÀÎÇÑ´Ù. µû¶ó¼­ °ÅÁþ ¾ç¼º¹ÝÀÀ(False Positive)À» º¸ÀÏ ¼ö ÀÖ´Ù.

* ¿µÇâÀ» ¹Þ´Â Ç÷§Æû:
CentOS Linux Server (v. 7)
ÇØ°áÃ¥ ´ÙÀ½ ÀýÂ÷¿¡ µû¶ó ¿µÇâ¹Þ´Â ÆÐÅ°Áö¸¦ ¾÷µ¥ÀÌÆ® ÇÑ´Ù.
System -> Administration -> Software Update

¶Ç´Â Ä¿¸Çµå¶óÀο¡¼­ ´ÙÀ½°ú °°ÀÌ OS¸¦ ¾÷µ¥ÀÌÆ® ÇÑ´Ù.
# yum update
°ü·Ã URL CVE-2019-11477,CVE-2019-11478,CVE-2019-11479 (CVE)
°ü·Ã URL (SecurityFocus)
°ü·Ã URL (ISS)