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RADIUSЭÒéÊÇÒ»ÖÖÓÃÓÚÔÚÍøÂç½ÓÈë·þÎñÆ÷£¨NAS£©ºÍÈÏÖ¤¡¢ÊÚȨ¡¢¼Æ·Ñ£¨AAA£©·þÎñÆ÷Ö®¼ä´«ÊäÓû§ÈÏÖ¤¡¢ÊÚȨºÍ¼Æ·ÑÐÅÏ¢µÄЭÒé¡£Ëüͨ¹ý¿Í»§¶ËºÍ·þÎñÆ÷Ö®¼äµÄͨѶÀ´ÑéÖ¤Óû§µÄÉí·Ý £¬²¢¾öÒéÓû§ÊÇ·ñÓÐȨ»á¼ûÍøÂç×ÊÔ´¡£

2024Äê7ÔÂ10ÈÕ £¬ÓÅ·¢¹ú¼ÊÍøÕ¾¹ÙÍø¼¯ÍÅVSRC¼à²âµ½RFC 2865ϵÄRADIUSЭÒé/UDP±»Åû¶±£´æαÔì¹¥»÷/ÓÕÆ­Îó²î£¨CVE-2024-3596 £¬±»³ÆΪBlast-RADIUS£© £¬ÏÖÔÚ¸ÃÎó²îµÄÊÖÒÕϸ½ÚÒѹûÕæ¡£

RADIUS ·þÎñÆ÷µÄRADIUSÏìÓ¦ÑéÖ¤Öб£´æÎó²î £¬¸ÃÎó²îÔ´ÓÚÑéÖ¤RADIUS·þÎñÆ÷µÄÉí·ÝÑéÖ¤ÏìӦʱʹÓÃÁ˼ÓÃÜÉϲ»Çå¾²µÄÍêÕûÐÔ¼ì²éÒªÁì £¬ÖÐÐÄÈ˹¥»÷Õß¿ÉÒÔ»á¼û´«Êä RADIUS ЭÒéµÄÍøÂç £¬ÔÚ²»ÐèÒª»ò²»Ç¿ÖÆʹÓà Message-Authenticator ÊôÐÔµÄÇéÐÎÏÂαÔì»ùÓÚUDPµÄRADIUSÏìÓ¦Êý¾Ý°ü £¬½«ÈκÎÓÐÓÃÏìÓ¦£¨»á¼û½ÓÊÜ¡¢»á¼û¾Ü¾ø»ò»á¼ûÖÊѯ£©ÐÞ¸ÄΪÈκÎÆäËûÏìÓ¦¡£


¶þ¡¢Ó°Ïì¹æÄ£

RFC 2865ÏÂËùÓÐʹÓÃUDPÉϵķÇEAPÉí·ÝÑéÖ¤ÒªÁìµÄRADIUSʵÏÖ

×¢£º½öÖ´ÐÐ RFC 3579 ÖÐÖ¸¶¨µÄ¿ÉÀ©Õ¹Éí·ÝÑé֤ЭÒé (EAP) µÄ RADIUS ·þÎñÆ÷²»ÊܸÃÎó²îÓ°Ïì £¬EAP Éí·ÝÑéÖ¤ÐÂÎÅÐèÒª Message-Authenticator ÊôÐÔ £¬¿É×èÖ¹¹¥»÷¡£Ê¹Óà TLS£¨»ò DTLS£©¼ÓÃÜÒ²¿ÉÒÔ×èÖ¹´ËÀ๥»÷¡£

 


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3.1 Éý¼¶°æ±¾

À¦°ó¿ªÔ´ RADIUS ʵÏÖ£¨ÈçFreeRadius£©µÄÖÆÔìÉÌÓ¦½«¿Í»§¶ËºÍ·þÎñÆ÷µÄÈí¼þ¸üе½×îпÉÓÃÈí¼þ £¬²¢ÇÒÖÁÉÙÒªÇóʹÓà Message-Authenticator ¾ÙÐÐ RADIUS Éí·ÝÑéÖ¤¡£ÏÖÔÚFreeRADIUSÒÑÌṩÁË3.0.27 ºÍ 3.2.5°æ±¾µÄÔ¤¹¹½¨Èí¼þ°ü £¬ÏÂÔØÁ´½Ó£º

https://www.networkradius.com/packages/

ÒÀÀµ»ùÓÚ RADIUS µÄЭÒé¾ÙÐÐ×°±¸»òÓû§Éí·ÝÑéÖ¤µÄÍøÂçÔËÓªÉÌÓ¦½«ÆäÈí¼þºÍÉèÖøüÐÂΪ¿Í»§¶ËºÍ·þÎñÆ÷µÄÇ徲ЭÒéÐÎʽ¡£Õâ¿ÉÒÔͨ¹ýÇ¿ÖÆʵÑé TLS »ò DTLS ¼ÓÃÜÀ´±£»¤ RADIUS ¿Í»§¶ËºÍ·þÎñÆ÷Ö®¼äµÄͨѶÀ´ÊµÏÖ¡£ÔÚ¿ÉÄܵÄÇéÐÎÏ £¬Ó¦Îª RADIUS ЭÒéÇ¿ÖÆʵÑéÍøÂç¸ôÀëºÍÇå¾² VPN ËíµÀͨѶ £¬ÒÔÏÞÖƲ»ÊÜÐÅÍеÄȪԴ¶ÔÕâЩÍøÂç×ÊÔ´µÄ»á¼û¡£

΢ÈíÒÑÔÚ7Ô²¹¶¡ÖÐÌṩÁËÊÜÓ°Ïì Windows °æ±¾µÄÇå¾²¸üÐÂÐÞ¸´Á˸ÃÎó²î £¬¿É²Î¿¼£º

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-3596

3.2 ÔÝʱ²½·¥

ÈôÊÇϵͳʹÓà PAP¡¢CHAP »ò MS-CHAP over RADIUS/UDP £¬ÔòÐèÒªÉý¼¶ FreeRADIUS £¬È»ºóʹÓÃеÄÉèÖñê¼ÇÖØÐÂÉèÖÃËü £¬¿É²Î¿¼:

https://www.freeradius.org/security/

3.3 ͨÓý¨Òé

l  °´ÆÚ¸üÐÂϵͳ²¹¶¡ £¬ïÔ̭ϵͳÎó²î £¬ÌáÉý·þÎñÆ÷µÄÇå¾²ÐÔ¡£

l  ÔöǿϵͳºÍÍøÂçµÄ»á¼û¿ØÖÆ £¬Ð޸ķÀ»ðǽսÂÔ £¬¹Ø±Õ·ÇÐëÒªµÄÓ¦Óö˿ڻò·þÎñ £¬ïÔÌ­½«Î£ÏÕ·þÎñ£¨ÈçSSH¡¢RDPµÈ£©Ì»Â¶µ½¹«Íø £¬ïÔÌ­¹¥»÷Ãæ¡£

l  ʹÓÃÆóÒµ¼¶Çå¾²²úÆ· £¬ÌáÉýÆóÒµµÄÍøÂçÇå¾²ÐÔÄÜ¡£

l  ÔöǿϵͳÓû§ºÍȨÏÞÖÎÀí £¬ÆôÓöàÒòËØÈÏÖ¤»úÖƺÍ×îСȨÏÞÔ­Ôò £¬Óû§ºÍÈí¼þȨÏÞÓ¦¼á³ÖÔÚ×îµÍÏ޶ȡ£

l  ÆôÓÃÇ¿ÃÜÂëÕ½ÂÔ²¢ÉèÖÃΪ°´ÆÚÐ޸ġ£

3.4 ²Î¿¼Á´½Ó

https://www.blastradius.fail/

https://www.blastradius.fail/pdf/radius.pdf

https://kb.cert.org/vuls/id/456537

https://www.freeradius.org/security/

https://datatracker.ietf.org/doc/draft-ietf-radext-deprecating-radius/

 


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