{"id":103636,"date":"2022-03-27T15:36:39","date_gmt":"2022-03-27T13:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-zlib-proyavlyayushhayasya-pri-szhatii-speczialno-oformlennyh-dannyh"},"modified":"2022-03-27T15:36:39","modified_gmt":"2022-03-27T13:36:39","slug":"uyazvimost-v-zlib-proyavlyayushhayasya-pri-szhatii-speczialno-oformlennyh-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-zlib-proyavlyayushhayasya-pri-szhatii-speczialno-oformlennyh-dannyh","title":{"rendered":"Sebezhet\u0151s\u00e9g a zlib-ben, amely kifejezetten form\u00e1zott adatok t\u00f6m\u00f6r\u00edt\u00e9sekor jelentkezik","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A s\u00e9r\u00fcl\u00e9kenys\u00e9g a zlib k\u00f6nyvt\u00e1rban (CVE-2018-25032) egy puffert\u00falcsordul\u00e1shoz vezet, amikor egy el\u0151re elk\u00e9sz\u00edtett karakterl\u00e1ncot pr\u00f3b\u00e1lunk t\u00f6m\u00f6r\u00edteni a bemeneti adatokban. Jelenlegi \u00e1llapot\u00e1ban a kutat\u00f3k bemutatt\u00e1k, hogy lehet\u0151s\u00e9g van a folyamat le\u00e1ll\u00edt\u00e1s\u00e1ra. M\u00e9g nem tanulm\u00e1nyozt\u00e1k, hogy a probl\u00e9ma tov\u00e1bbi s\u00falyos k\u00f6vetkezm\u00e9nyekkel j\u00e1rhat-e. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g a zlib 1.2.2.2 verzi\u00f3j\u00e1t\u00f3l kezd\u0151d\u0151en jelentkezik \u00e9s \u00e9rinti a zlib 1.2.11 legfrissebb kiad\u00e1s\u00e1t is. \u00c9rdekes, hogy a s\u00e9r\u00fcl\u00e9kenys\u00e9g jav\u00edt\u00e1s\u00e1ra a jav\u00edt\u00f3csomag m\u00e1r 2018-ban javasolt\u00e1k, de a fejleszt\u0151k nem figyeltek r\u00e1 \u00e9s nem adtak ki helyesb\u00edt\u00e9st (a zlib k\u00f6nyvt\u00e1r utolj\u00e1ra 2017-ben friss\u00fclt). A jav\u00edt\u00e1s m\u00e9g nem ker\u00fclt bele a disztrib\u00faci\u00f3k \u00e1ltal k\u00edn\u00e1lt csomagokba sem. A disztrib\u00faci\u00f3k \u00e1ltal kiadott jav\u00edt\u00e1sok nyomon k\u00f6vethet\u0151k ezeken az oldalakon: Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux, OpenBSD, FreeBSD, NetBSD. A zlib-ng k\u00f6nyvt\u00e1r nem \u00e9rintett a probl\u00e9m\u00e1ban. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g akkor jelentkezik, ha a bemeneti folyamban sok, csomagol\u00e1sra alkalmas egyez\u00e9s tal\u00e1lhat\u00f3, amelyekre fix Huffman k\u00f3dok alap\u00fa csomagol\u00e1s vonatkozik. Bizonyos k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt a k\u00f6zbens\u0151 pufferen t\u00e1rolt t\u00f6m\u00f6r\u00edtett eredm\u00e9ny tartalma \u00e1tfedheti azt a mem\u00f3ri\u00e1t, amelyben a karakterek frekvenciat\u00e1bl\u00e1ja tal\u00e1lhat\u00f3. Ennek k\u00f6vetkezt\u00e9ben helytelen t\u00f6m\u00f6r\u00edtett adatok keletkeznek, \u00e9s a puffert\u00falcsordul\u00e1s miatt \u00f6sszeomlik a rendszer. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g csak akkor kihaszn\u00e1lhat\u00f3, ha a fix Huffman k\u00f3dokon alapul\u00f3 csomagol\u00e1si strat\u00e9gi\u00e1t haszn\u00e1lj\u00e1k. Ilyen strat\u00e9gia v\u00e1laszthat\u00f3, ha a k\u00f3dban kifejezetten enged\u00e9lyezik az Z_FIXED opci\u00f3t (p\u00e9lda egy sorozatra, amely \u00f6sszeoml\u00e1st okoz az Z_FIXED opci\u00f3 haszn\u00e1latakor). A k\u00f3d alapj\u00e1n a Z_FIXED strat\u00e9gia automatikusan is v\u00e1laszthat\u00f3, ha az adatokhoz sz\u00e1m\u00edtott optim\u00e1lis \u00e9s statikus f\u00e1k azonos m\u00e9ret\u0171ek. <\/p>\n

Jelenleg nem vil\u00e1gos, hogy lehets\u00e9ges-e a Z_DEFAULT_STRATEGY t\u00f6m\u00f6r\u00edt\u00e9si strat\u00e9gia kihaszn\u00e1lhat\u00f3s\u00e1gi felt\u00e9teleit megteremteni, amely az alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1s. Ha nem, akkor a s\u00e9r\u00fcl\u00e9kenys\u00e9g korl\u00e1toz\u00f3dni fog bizonyos specifikus rendszerekre, ahol kifejezetten alkalmazz\u00e1k a Z_FIXED opci\u00f3t. Ha igen, akkor a s\u00e9r\u00fcl\u00e9kenys\u00e9gb\u0151l sz\u00e1rmaz\u00f3 k\u00e1r nagyon jelent\u0151s lehet, mivel a zlib k\u00f6nyvt\u00e1r de facto szabv\u00e1nynak sz\u00e1m\u00edt, \u00e9s sz\u00e1mos n\u00e9pszer\u0171 projektben haszn\u00e1lj\u00e1k, bele\u00e9rtve a Linux magot, az OpenSSH-t, az OpenSSL-t, az apache httpd-t, a libpng-t, a FFmpeg-et, a rsync-et, a dpkg-t, a rpm-t, a Git-et, a PostgreSQL-t, a MySQL-t stb.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 zlib \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2018-25032), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u043f\u043e\u043f\u044b\u0442\u043a\u0435 \u0441\u0436\u0430\u0442\u0438\u044f \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 \u0432\u043e \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0445 \u0434\u0430\u043d\u043d\u044b\u0445. \u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c \u0432\u0438\u0434\u0435 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u043e\u0432\u0430 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430. \u041c\u043e\u0436\u0435\u0442 \u043b\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0438\u043c\u0435\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u0441\u0435\u0440\u044c\u0451\u0437\u043d\u044b\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u0435\u0449\u0451 \u043d\u0435 \u0438\u0437\u0443\u0447\u0435\u043d\u043e. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 zlib 1.2.2.2 \u0438 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a zlib […]<\/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-103636","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\udd47S\u00e9r\u00fcl\u00e9kenys\u00e9g a zlib-ben, amely a kifejezetten form\u00e1zott adatok t\u00f6m\u00f6r\u00edt\u00e9sekor l\u00e9p fel 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