{"id":42604,"date":"2017-09-19T11:52:01","date_gmt":"2017-09-19T18:52:01","guid":{"rendered":"https:\/\/www.paloaltonetworks.com\/blog\/?p=42604"},"modified":"2017-09-20T20:20:47","modified_gmt":"2017-09-21T03:20:47","slug":"unit42-threat-brief-patch-today-dont-get-burned-android-toast-overlay-attack","status":"publish","type":"post","link":"https:\/\/origin-researchcenter.paloaltonetworks.com\/blog\/2017\/09\/unit42-threat-brief-patch-today-dont-get-burned-android-toast-overlay-attack\/?lang=ko","title":{"rendered":"\uc704\ud611 \ube0c\ub9ac\ud551: \uc548\ub4dc\ub85c\uc774\ub4dc \ud1a0\uc2a4\ud2b8 \uc624\ubc84\ub808\uc774 \ucde8\uc57d\uc810 \uacbd\uace0 \ubc0f \uae34\uae09 \ud328\uce58 \uc548\ub0b4"},"content":{"rendered":"<p>\ud314\ub85c\uc54c\ud1a0 \ub124\ud2b8\uc6cd\uc2a4 Unit 42\uac00 \uad6c\uae00 \uc548\ub4dc\ub85c\uc774\ub4dc \ud50c\ub7ab\ud3fc\uc5d0 \uc2ec\uac01\ud55c \ud53c\ud574\ub97c \uc785\ud788\ub294 \uc0c8\ub85c\uc6b4 \ucde8\uc57d\uc810\uc5d0 \ub300\ud55c <a href=\"https:\/\/www.paloaltonetworks.com\/blog\/2017\/09\/unit42-android-toast-overlay-attack-cloak-and-dagger-with-no-permissions\/\">\uc0c1\uc138 \uc815\ubcf4<\/a>\ub97c \ubc1c\ud45c\ud588\ub2e4. \uc774 \ucde8\uc57d\uc810\uc5d0 \ub300\ud55c \ubcf4\uc548 \ud328\uce58\ub294 <a href=\"https:\/\/source.android.com\/security\/bulletin\/2017-09-01\" rel=\"nofollow,noopener\" >2017\ub144 9\uc6d4 \uc548\ub4dc\ub85c\uc774\ub4dc \ubcf4\uc548 \uac8c\uc2dc\ud310<\/a>\uc5d0\uc11c \ud655\uc778\ud560 \uc218 \uc788\ub2e4. \uc774 \uc0c8\ub85c\uc6b4 \ucde8\uc57d\uc810\uc740 \uac00\uc7a5 \ucd5c\uc2e0 \ubc84\uc804\uc778 <a href=\"https:\/\/www.android.com\/versions\/oreo-8-0\/\" rel=\"nofollow,noopener\" >Android 8.0 Oreo<\/a>\ub97c \uc81c\uc678\ud55c \uc774\uc804 \ubaa8\ub4e0 \ubc84\uc804\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce5c\ub2e4. \uc774 \uae00\uc5d0 \uc124\uba85\ub41c \uc77c\ubd80 \ubca1\ud130\ub97c \uc775\uc2a4\ud50c\ub85c\uc787\ud558\ub294 \uc545\uc131 \ucf54\ub4dc\uac00 \uc788\uae30\ub294 \ud558\uc9c0\ub9cc, \ud314\ub85c\uc54c\ud1a0 \ub124\ud2b8\uc6cd\uc2a4 Unit 42\ub294 \ud604\uc7ac\ub85c\uc11c\ub294 \uc774 \ud2b9\uc815 \ucde8\uc57d\uc810\uc5d0 \ub300\ud55c \uc2e4\uc81c \uacf5\uaca9 \uc0ac\ub840\ub294 \uc544\uc9c1 \ubc1c\uacac\ud558\uc9c0 \ubabb\ud588\ub2e4. Android 8.0\uc774 \ube44\uad50\uc801 \ucd5c\uc2e0 \ubc84\uc804\uc774\ub77c\ub294 \uc810\uc744 \uac10\uc548\ud558\uba74, \uac70\uc758 \ubaa8\ub4e0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc0ac\uc6a9\uc790\ub4e4\uc774 \uc9c0\uae08 \ub2f9\uc7a5 \uc5c5\ub370\uc774\ud2b8\ub97c \uc801\uc6a9\ud558\uc5ec \uc774 \ucde8\uc57d\uc810\uc5d0 \ub300\uc751\ud574\uc57c \ud55c\ub2e4\uace0 \ubcfc \uc218 \uc788\ub2e4.<\/p>\n<p>Unit 42\uac00 \ubc1c\uacac\ud55c \uc774 \ucde8\uc57d\uc810\uc740 \uc774\ubbf8 \uc54c\ub824\uc9c4 \uacf5\uaca9 \uc720\ud615\uc778 \uc548\ub4dc\ub85c\uc774\ub4dc \ud50c\ub7ab\ud3fc \u2018\uc624\ubc84\ub808\uc774 \uacf5\uaca9(overlay attack)\u2019\uc744 \uc27d\uac8c \ub9cc\ub4e4\uc5b4 \uc900\ub2e4. \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc740 \uc0ac\uc6a9\uc790 \uc548\ub4dc\ub85c\uc774\ub4dc \uae30\uae30\uc5d0 \uc545\uc131 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uc124\uce58\ud558\ub294 \ub370 \uc8fc\ub85c \uc0ac\uc6a9\ub41c\ub2e4.\u00a0 \ub610\ud55c \uc545\uc131 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uac00 \uae30\uae30 \ud1b5\uc81c\uad8c\uc744 \uc7a5\uc545\ud558\ub294 \ub370\uc5d0\ub3c4 \uc0ac\uc6a9\ub420 \uc218 \uc788\ub2e4. \ucd5c\uc545\uc758 \uacf5\uaca9 \uc2dc\ub098\ub9ac\uc624\ub294 \uc774 \ucde8\uc57d\uc810\uc744 \uc545\uc6a9\ud558\uc5ec \uc2a4\ub9c8\ud2b8\ud3f0\uc744 \uc0ac\uc6a9 \ubd88\uac00\ub2a5\ud55c \u201c\ubcbd\ub3cc(brick) \uc0c1\ud0dc\ub85c \ub9cc\ub4e4\uac70\ub098, \ub79c\uc12c\uc6e8\uc5b4\ub098 \uc778\ud3ec\uba54\uc774\uc158 \uc2a4\ud2f8\ub7ec(information stealer) \uac19\uc740 \uba40\uc6e8\uc5b4\ub97c \uc124\uce58\ud558\ub294 \uac83\uc774\ub2e4. \uac04\ub2e8\ud788 \ub9d0\ud574 \uc774 \ucde8\uc57d\uc810\uc740 \uae30\uae30 \uc81c\uc5b4\uad8c \ud0c8\ucde8, \uae30\uae30 \uc7a0\uae08, \uc815\ubcf4 \uc720\ucd9c \ub4f1\uc5d0 \uc545\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>\uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc740 \uc545\uc131 \uc571 \uc704\uc5d0 \uac00\uc9dc \ucc3d\uc744 \ub744\uc6b0\ub294(\u201c\uc624\ubc84\ub808\uc774\u201d\ud558\ub294) \u00a0\uacf5\uaca9\uc774\ub2e4. \uc0ac\uc6a9\uc790\uac00 \ud654\uba74\uc5d0 \ub098\ud0c0\ub09c \uac00\uc9dc \ucc3d\uc744 \ud074\ub9ad\ud558\uba74, \uc2e4\uc81c\ub85c\ub294 \ubc11\uc5d0 \uae54\ub9b0 \uc545\uc131 \uc571\uc744 \ud074\ub9ad\ud558\uac8c \ub41c\ub2e4. \uadf8\ub9bc 1\uc5d0 \ub098\uc640\uc788\ub294 \uac83\uacfc \uac19\uc774, \uc0ac\uc6a9\uc790\uac00 \uc624\ubc84\ub808\uc774\ub41c \uac00\uc9dc \ucc3d\uc5d0\uc11c \ud328\uce58 \uc778\uc2a4\ud1a8\uc744 \ud074\ub9ad\ud558\uba74 \uc2e4\uc81c\ub85c\ub294 Porn Droid \uba40\uc6e8\uc5b4\uc5d0 \uc804\uccb4 \uad00\ub9ac\uc790 \uad8c\ud55c\uc774 \ubd80\uc5ec\ub418\ub294 \uc2dd\uc774\ub2e4.<\/p>\n<p><div style=\"max-width:100%\" data-width=\"623\"><span class=\"ar-custom\" style=\"padding-bottom:94.06%;\"><img loading=\"lazy\" decoding=\"async\"  class=\"alignnone size-full wp-image-42424 lozad\"  data-src=\"https:\/\/www.paloaltonetworks.com\/blog\/wp-content\/uploads\/2017\/09\/Eila_toast-1.png\" alt=\"Eila_toast\" width=\"623\" height=\"586\" \/><\/span><\/div><\/p>\n<p>\uadf8\ub9bc 1: \uad00\ub9ac\uc790 \uad8c\ud55c\uc744 \uc694\uccad\ud558\ub294 \uba40\uc6e8\uc5b4 \uc704\uc5d0 \uc624\ubc84\ub808\uc774\ub41c \uac00\uc9dc \ud328\uce58 \uc124\uce58 \ud504\ub85c\uadf8\ub7a8<\/p>\n<p>\uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc740 \uc774\uc640 \uac19\uc740 \ubc29\uc2dd\uc73c\ub85c \uc0ac\uc6a9\uc790 \ubab0\ub798 \uae30\uae30\uc5d0 \uba40\uc6e8\uc5b4\ub97c \uc124\uce58\ud55c\ub2e4. \ub610\ud55c \uba40\uc6e8\uc5b4\uc5d0 \uae30\uae30 \uc804\uccb4\uc5d0 \ub300\ud55c \uad00\ub9ac\uc790 \uad8c\ud55c\uc744 \ubd80\uc5ec\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n<p>\uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc740 \ub610\ud55c \uc0ac\ub77c\uc9c0\uc9c0 \uc54a\ub294 \ucc3d\ub4e4\uc744 \ub744\uc6cc \uae30\uae30\ub97c DoS(denial-of-service) \uc0c1\ud0dc\ub85c \ub9cc\ub4dc\ub294 \ub370 \uc0ac\uc6a9\ub418\uae30\ub3c4 \ud55c\ub2e4. \uc774\uac83\uc740 \ubaa8\ubc14\uc77c \uae30\uae30 \ub79c\uc12c\uc6e8\uc5b4 \uacf5\uaca9\uc5d0\uc11c \uacf5\uaca9\uc790\uac00 \uc0ac\uc6a9\ud558\ub294 \ubc29\uc2dd\uc774\ub2e4.<\/p>\n<p>\ubb3c\ub860 \ub2e8\uc77c \uacf5\uaca9\uc5d0\uc11c \ub2e4\uc74c\uc758 \uc138\uac00\uc9c0 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \ubaa8\ub450 \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n<ol>\n<li>\uc0ac\uc6a9\uc790\ub97c \uc18d\uc5ec \uae30\uae30\uc5d0 \uba40\uc6e8\uc5b4 \uc124\uce58.<\/li>\n<li>\uc0ac\uc6a9\uc790\ub97c \uc18d\uc5ec \uba40\uc6e8\uc5b4\uc5d0 \uae30\uae30 \uc804\uccb4 \uad00\ub9ac\uc790 \uad8c\ud55c \ubd80\uc5ec.<\/li>\n<li>\uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \uc0ac\uc6a9\ud558\uc5ec \uae30\uae30\ub97c \uc7a0\uae08 \uc0c1\ud0dc\ub85c \ub9cc\ub4e4\uace0 \ub79c\uc12c\uba38\ub2c8\ub97c \uc704\ud55c \uc778\uc9c8\ub85c \ud3ec\ud68d.<\/li>\n<\/ol>\n<p>\uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc740 \uc790\uccb4\ub294 \uc0c8\ub85c\uc6b4 \uac83\uc774 \uc544\ub2c8\uba70, \uc774\uc804\uc5d0\ub3c4 \uc5b8\uae09\ub41c \ubc14 \uc788\ub2e4. \ud558\uc9c0\ub9cc <a href=\"http:\/\/iisp.gatech.edu\/sites\/default\/files\/documents\/ieee_sp17_cloak_and_dagger_final.pdf\" rel=\"nofollow,noopener\" >IEEE Security &amp; Privacy \ubcf4\uace0\uc11c<\/a>\uc5d0 \ub530\ub974\uba74, \uc5ec\ud0dc\uae4c\uc9c0\ub294 \uc545\uc131 \uc571\uc774 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \uc131\uacf5\uc2dc\ud0a4\ub824\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \ub450 \uac00\uc9c0 \uae4c\ub2e4\ub85c\uc6b4 \uc870\uac74\uc744 \ucda9\uc871\uc2dc\ucf1c\uc57c \ud558\ub294 \uac83\uc73c\ub85c \uc54c\ub824\uc838 \uc788\uc5c8\ub2e4.<\/p>\n<ol>\n<li>\uc0ac\uc6a9\uc790\uac00 \ud31d\uc5c5 \uacbd\uace0\ucc3d\uc744 \uac00\uc7a5 \uc0c1\uc704\uc5d0 \ub744\uc6b0\ub294 \uc635\uc158\uc744 \uc2b9\uc778\ud558\ub3c4\ub85d \uc694\uccad\ud574\uc57c \ud568.<\/li>\n<li>\uc545\uc131 \uc571\uc744 \uad6c\uae00 \ud50c\ub808\uc774(Google Play)\uc5d0 \ub4f1\ub85d\ud574\uc57c \ud568.<\/li>\n<\/ol>\n<p>\uc774\ub7ec\ud55c \ub450 \uac00\uc9c0 \ub09c\uad00\uc774 \uacf5\uaca9\uc758 \uac78\ub9bc\ub3cc\ub85c \uc791\uc6a9\ud558\ub294 \uae4c\ub2ed\uc5d0, \uc5ec\ud0dc\uae4c\uc9c0\ub294 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc774 \uc2ec\uac01\ud55c \uc704\ud611\uc73c\ub85c \uac04\uc8fc\ub418\uc9c0 \uc54a\uc558\ub2e4.<\/p>\n<p>\uadf8\ub7ec\ub098 Unit 42\uc758 \ucd5c\uadfc \uc870\uc0ac\uc5d0\uc11c \uc774 \ub450 \uc870\uac74\uc744 \ub9cc\uc871\uc2dc\ud0a4\uc9c0 \uc54a\uc544\ub3c4 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \uc2e4\ud589\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \uc788\ub294 \uac83\uc73c\ub85c \ud655\uc778\ub418\uc5c8\ub2e4. Unit 42\ub294 \uc774 \uc0c8\ub85c\uc6b4 \ucde8\uc57d\uc810\uc744 \ud65c\uc6a9\ud558\uac8c \ub418\uba74 \uc545\uc131 \uc571\uc774 \uae30\uae30\uc5d0 \uc778\uc2a4\ud1a8\ub9cc \ub418\uc5b4\ub3c4 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc774 \uac00\ub2a5\ud558\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c\uc544\ub0c8\ub2e4. \uc774\ub294 \ud2b9\ud788 \uad6c\uae00 \ud50c\ub808\uc774 \uc774\uc678\uc758 \uc6f9 \uc0ac\uc774\ud2b8 \ubc0f \uc571\uc2a4\ud1a0\uc5b4\uc758 \uc545\uc131 \uc571\uc774 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc74c\uc744 \uc758\ubbf8\ud55c\ub2e4. \uad6c\uae00 \ud50c\ub808\uc774 \uc774\uc678\uc758 \uc6f9 \uc0ac\uc774\ud2b8\uc640 \uc571\uc2a4\ud1a0\uc5b4\uc5d0\uc11c \ubc30\ud3ec\ub418\ub294 \uc571\ub4e4\uc774 \uc804\uc138\uacc4 \uc548\ub4dc\ub85c\uc774\ub4dc \uba40\uc6e8\uc5b4\uc758 \uc8fc\uc694 \uc18c\uc2a4\uc784\uc744 \uba85\uc2ec\ud574\uc57c \ud55c\ub2e4.<\/p>\n<p>\ubb38\uc81c\uc758 \ucde8\uc57d\uc810\uc740 \uc548\ub4dc\ub85c\uc774\ub4dc\uc758 \u201c<a href=\"https:\/\/developer.android.com\/guide\/topics\/ui\/notifiers\/toasts.html\" rel=\"nofollow,noopener\" >\ud1a0\uc2a4\ud2b8(Toast)<\/a>\u201d \uae30\ub2a5\uc5d0 \uc788\ub2e4. \ud1a0\uc2a4\ud2b8 \uae30\ub2a5\uc774\ub780 \uc2a4\ud06c\ub9b0 \uc704\uc5d0 \uc54c\ub9bc \ucc3d\uc744 \ub9c8\uce58 \ud1a0\uc2a4\ud2b8\ucc98\ub7fc \ud31d\uc5c5\uc2dc\ud0a4\ub294 \uac83\uc774\ub2e4. \ud1a0\uc2a4\ud2b8 \uae30\ub2a5\uc740 \uc2e4\ud589 \uc911\uc778 \ub2e4\ub978 \uc571\ub4e4 \uc704\ub85c \uba54\uc2dc\uc9c0\ub098 \uc54c\ub9bc\uc744 \ud45c\uc2dc\ud558\ub294 \ub370 \uc8fc\ub85c \uc0ac\uc6a9\ub41c\ub2e4.<\/p>\n<p>\uc548\ub4dc\ub85c\uc774\ub4dc\uc758 \ub2e4\ub978 \uc708\ub3c4\uc6b0 \uc885\ub958\ub4e4\uacfc \ub2ec\ub9ac, \ud1a0\uc2a4\ud2b8\ub294 \uc2b9\uc778\uc744 \uc694\uccad\ud558\uc9c0 \uc54a\ub294\ub2e4. \ub530\ub77c\uc11c \uc774\uc804\uc5d0 \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc744 \uac00\ub85c\ub9c9\uc558\ub358 \uc7a5\uc560\ubb3c\uc774 \uc5c6\uc5b4\uc9c0\ub294 \uac83\uc774\ub2e4. \ub610\ud55c \uc2a4\ud06c\ub9b0 \uc804\uccb4\ub97c \uc624\ubc84\ub808\uc774\ud558\ub294 \ud1a0\uc2a4\ud2b8 \ucc3d\uc744 \ub9cc\ub4dc\ub294 \uac83\uc774 \uac00\ub2a5\ud558\uae30 \ub54c\ubb38\uc5d0, \uacf5\uaca9\uc790\uac00 \ud1a0\uc2a4\ud2b8 \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc77c\ubc18 \uc571\uacfc \uae30\ub2a5\uc801\uc73c\ub85c \ub3d9\uc77c\ud558\uac8c \ubcf4\uc774\ub294 \ucc3d\uc744 \ub9cc\ub4e4 \uc218 \uc788\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>\uc774\ub7ec\ud55c \ucd5c\uc2e0 \uc870\uc0ac \uacb0\uacfc\uc5d0 \ube44\ucdb0\ubcfc \ub54c, \uc624\ubc84\ub808\uc774 \uacf5\uaca9\uc758 \uc704\ud5d8\uc131\uc774 \ub9e4\uc6b0 \uc2ec\uac01\ud558\ub2e4 \ud560 \uc218 \uc788\ub2e4. \ub2e4\ud589\uc774 \uc548\ub4dc\ub85c\uc774\ub4dc \ucd5c\uc2e0 \ubc84\uc804\uc740 \uc774\ub7ec\ud55c \uacf5\uaca9\uc73c\ub85c\ubd80\ud130 \uc548\uc804\ud558\ub2e4. \uadf8\ub7ec\ub098 \ub300\ubd80\ubd84\uc758 \uc548\ub4dc\ub85c\uc774\ub4dc \uc0ac\uc6a9\uc790\ub4e4\uc774 \uacf5\uaca9\uc5d0 \ucde8\uc57d\ud55c \uad6c\ubc84\uc804\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\ub2e4. \ub530\ub77c\uc11c 8.0 \uc774\ud558 \ubc84\uc804\uc744 \uc0ac\uc6a9\ud558\ub294 \uc548\ub4dc\ub85c\uc774\ub4dc \uc0ac\uc6a9\uc790\ub4e4\uc740 \ubc18\ub4dc\uc2dc \uc5c5\ub370\uc774\ud2b8\ub97c \uc2e4\ud589\ud574\uc57c \ud55c\ub2e4. \ud328\uce58 \ubc0f \uc5c5\ub370\uc774\ud2b8 \uad00\ub828 \uc815\ubcf4\ub294 \ud574\ub2f9 \uc774\ub3d9\ud1b5\uc2e0\uc0ac\ub098 \uae30\uae30 \uc81c\uc870\uc0ac\uc5d0\uc11c \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>\ubb3c\ub860 \uc545\uc131 \uc571\uc744 \ubc29\uc5b4\ud558\ub294 \uac00\uc7a5 \uc88b\uc740 \ubc29\ubc95\uc740 \uc548\ub4dc\ub85c\uc774\ub4dc \ubcf4\uc548\ud300\uc774 \uc545\uc131 \uc571\uc744 \ucc28\ub2e8\ud558\uace0 \uac78\ub7ec\ub0b4\ub294 \uad6c\uae00 \ud50c\ub808\uc774\ub97c \ud1b5\ud574\uc11c\ub9cc \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc744 \ub2e4\uc6b4\ub85c\ub4dc\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc704\ud611 \ube0c\ub9ac\ud551: \uc548\ub4dc\ub85c\uc774\ub4dc \ud1a0\uc2a4\ud2b8 \uc624\ubc84\ub808\uc774 \ucde8\uc57d\uc810 \uacbd\uace0 \ubc0f \uae34\uae09 \ud328\uce58 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