{"id":107183,"date":"2023-03-10T18:48:11","date_gmt":"2023-03-10T16:48:11","guid":{"rendered":"https:\/\/prohoster.info\/?p=107183"},"modified":"2023-03-13T12:06:39","modified_gmt":"2023-03-13T10:06:39","slug":"kriticheskaya-uyazvimost-v-wasmtime-runtime-dlya-webassembly-prilozhenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-uyazvimost-v-wasmtime-runtime-dlya-webassembly-prilozhenij","title":{"rendered":"Kritick\u00e1 zranitelnost ve Wasmtime, runtime pro aplikace WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V aktualizac\u00edch Wasmtime 6.0.1, 5.0.1 a 4.0.1 byla odstran\u011bna zranitelnost (CVE-2023-26489), kter\u00e1 byla klasifikov\u00e1na jako kritick\u00e1. Tato zranitelnost umo\u017e\u0148uje z\u00e1pis dat do oblasti pam\u011bti mimo povolen\u00e9 hranice pro izolovan\u00fd k\u00f3d WebAssembly, co\u017e m\u016f\u017ee b\u00fdt potenci\u00e1ln\u011b zneu\u017eito \u00fato\u010dn\u00edkem k prov\u00e1d\u011bn\u00ed vlastn\u00edho k\u00f3du mimo izolovan\u00e9 prost\u0159ed\u00ed WASI. <\/p>\n

Wasmtime je runtime pro b\u011bh aplikac\u00ed WebAssembly s roz\u0161\u00ed\u0159en\u00edmi WASI (WebAssembly System Interface) jako b\u011b\u017en\u00fdch izolovan\u00fdch aplikac\u00ed. N\u00e1stroj je naps\u00e1n v jazyce Rust a zranitelnost je zp\u016fsobena logickou chybou p\u0159i definov\u00e1n\u00ed pravidel line\u00e1rn\u00ed adresace pam\u011bti v gener\u00e1toru k\u00f3du Cranelift, kter\u00fd p\u0159ev\u00e1d\u00ed hardwarov\u011b nez\u00e1visl\u00e9 mezip\u0159edstav\u011bn\u00ed na spustiteln\u00fd strojov\u00fd k\u00f3d pro architekturu x86_64. <\/p>\n

Konkr\u00e9tn\u011b pro aplikace WebAssembly byly po\u010d\u00edt\u00e1ny 35bitov\u00e9 efektivn\u00ed adresy m\u00edsto povolen\u00fdch 33bitov\u00fdch adres ve WebAssembly, co\u017e posunulo hranici povolen\u00e9 pro operace \u010dten\u00ed a z\u00e1pisu virtu\u00e1ln\u00ed pam\u011bti na 34 GB, zat\u00edmco nastaven\u00ed sandboxov\u00e9ho prost\u0159ed\u00ed poskytuje ochranu pro 6 GB od z\u00e1kladn\u00ed adresy. V\u00fdsledkem bylo, \u017ee rozsah virtu\u00e1ln\u00ed pam\u011bti od 6 do 34 GB od z\u00e1kladn\u00ed adresy byl p\u0159\u00edstupn\u00fd pro \u010dten\u00ed a z\u00e1pis z aplikac\u00ed WebAssembly. V t\u00e9to pam\u011bti mohou b\u00fdt um\u00edst\u011bna jin\u00e1 prost\u0159ed\u00ed WebAssembly nebo komponenty runtime WebAssembly. <\/p>\n

Pokud nen\u00ed mo\u017en\u00e9 aktualizovat verzi Wasmtime, jako alternativn\u00ed zp\u016fsoby blokov\u00e1n\u00ed chyby je zm\u00edn\u011bno nastaven\u00ed volby «Config::static_memory_maximum_size(0)» pro povolen\u00ed povinn\u00e9 samostatn\u00e9 kontroly hranic p\u0159i jak\u00e9mkoli p\u0159\u00edstupu k line\u00e1rn\u00ed pam\u011bti (co\u017e vede k v\u00fdznamn\u00e9mu sn\u00ed\u017een\u00ed v\u00fdkonu). Dal\u0161\u00ed variantou je pou\u017eit\u00ed nastaven\u00ed «Config::static_memory_guard_size(1 < 36)» pro zv\u00fd\u0161en\u00ed po\u010dtu str\u00e1\u017en\u00edch str\u00e1nek pam\u011bti (Guard Page, p\u0159i p\u0159\u00edstupu doch\u00e1z\u00ed k vygenerov\u00e1n\u00ed v\u00fdjimky), kter\u00e9 se umis\u0165uj\u00ed do problematick\u00e9ho rozsahu virtu\u00e1ln\u00ed pam\u011bti (co\u017e vede k rezervaci velk\u00e9ho objemu virtu\u00e1ln\u00ed pam\u011bti a omezen\u00ed po\u010dtu sou\u010dasn\u011b prov\u00e1d\u011bn\u00fdch WebAssembly aplikac\u00ed).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0445 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 Wasmtime 6.0.1, 5.0.1 \u0438 4.0.1 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-26489), \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0437\u0430\u043f\u0438\u0441\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u043d\u0435 \u0433\u0440\u0430\u043d\u0438\u0446\u044b, \u0434\u043e\u043f\u0443\u0441\u0442\u0438\u043c\u043e\u0439 \u0434\u043b\u044f \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e WebAssembly-\u043a\u043e\u0434\u0430, \u0447\u0442\u043e \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u043e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u043c \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0432\u043d\u0435 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f WASI. Wasmtime \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 runtime \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f WebAssembly-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0441 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f\u043c\u0438 WASI […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-107183","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Kritick\u00e1 zranitelnost v Wasmtime, runtime pro aplikace WebAssembly | ProHoster","description":"V aktualizac\u00edch Wasmtime 6.0.1, 5.0.1 a 4.0.1 byla odstran\u011bna zranitelnost (CVE-2023-26489), kter\u00e1 byla klasifikov\u00e1na jako kritick\u00e1.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-uyazvimost-v-wasmtime-runtime-dlya-webassembly-prilozhenij","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Wasmtime, runtime \u0434\u043b\u044f WebAssembly-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 | ProHoster","og:description":"\u0412 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0445 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 Wasmtime 6.0.1, 5.0.1 \u0438 4.0.1 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-26489), \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-uyazvimost-v-wasmtime-runtime-dlya-webassembly-prilozhenij","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-03-10T16:48:11+00:00","article:modified_time":"2023-03-13T10:06:39+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/107183","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=107183"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/107183\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=107183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=107183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=107183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}