{"id":55016,"date":"2020-01-10T00:00:00","date_gmt":"2020-01-09T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-e2fsck-proyavlyayushhayasya-pri-obrabotke-spetsialno-oformlennyh-katalogov"},"modified":"2020-02-18T14:03:05","modified_gmt":"2020-02-18T11:03:05","slug":"uyazvimost-v-e2fsck-proyavlyayushhayasya-pri-obrabotke-spetsialno-oformlennyh-katalogov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-e2fsck-proyavlyayushhayasya-pri-obrabotke-spetsialno-oformlennyh-katalogov","title":{"rendered":"Viga e2fsck-s, mis ilmneb spetsiaalselt kujundatud kataloogide t\u00f6\u00f6tlemisel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

E2fsck utiliidis, mis on osa pakist e2fsprogs<\/a><\/noindex>, tuvastatud<\/a><\/noindex> haavatavus<\/a><\/noindex> (CVE-2019-5188<\/a><\/noindex>), mis v\u00f5imaldab r\u00fcndajal saada koodi t\u00e4itmise \u00f5iguse, kui kontrollitakse failis\u00fcsteemi, mis sisaldab erikujundusega katalooge. Haavatavust on kinnitatud versioonides 1.43.3 kuni 1.45.4. Haavatavus on k\u00f5rvaldatud uuenduses e2fsck 1.45.5<\/a><\/noindex>. Distroodes j\u00e4\u00e4b probleem veel lahendamata (Debian<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>).<\/p>\n

Haavatavus on tingitud veast funktsioonis mutate_name() failis rehash.c, mis rakendatakse seotud katalooge puudutavate hash-tabelite taastamisel, tagades katalooge k\u00f5igi seal sisalduvate failide vastandamise. Kataloogiga seotud struktuuri hash_entry kahjustamine v\u00f5ib viia r\u00fcndaja andmete kirjutamiseni m\u00e4lupiirkonda, mis ei ole reserveeritud. Kui hash-tabelis tuvastatakse mitu failide sidumist \u00fche ja sama nimega, siis e2fsck utiliit nimetab dubleerivad failid \u00fcmber, lisades nimele ~0, ~1 jne. Sellise \u00fcmbernimetamise ajaks reserveeritakse 256 baitine puhver, et ajutiselt hoida uut nime. <\/p>\n

Kopeeritava andmete suurus m\u00e4\u00e4ratakse v\u00e4ljendiga «entry->name_len & 0xff», kuid v\u00e4\u00e4rtus entry->name_len laaditakse struktuurist kettale, mitte arvutatakse tegeliku nime suuruse p\u00f5hjal. Kui suurus on null, siis massiivi indeksi v\u00e4\u00e4rtus on -1 ja luuakse tingimused t\u00e4isarvude \u00fclevooluks l\u00e4bi puhverpiiri (integer underflow) ning muude andmete kirjutamiseks virna v\u00e4\u00e4rtusega «~0». 64-bitiste s\u00fcsteemide puhul on haavatavuse \u00e4rakasutamine hinnatud kui v\u00e4het\u00f5en\u00e4oline ja n\u00f5uab virna suuruse piiramise puudumist (ulimit -s unlimited). 32-bitiste s\u00fcsteemide puhul peetakse \u00e4rakasutamist v\u00f5imalikuks, kuid tulemusele avaldab suurt m\u00f5ju see, kuidas oli t\u00e4idetud t\u00e4itemooduli fail.<\/p>\n

R\u00fcnnaku teostamiseks peab r\u00fcndaja teatud viisil kahjustama andmeid ext2, ext3 v\u00f5i ext4 failis\u00fcsteemis. Kuna see operatsioon n\u00f5uab superkasutaja \u00f5igusi, kujutab haavatavus ohtu, kui e2fsck utiliit kontrollib v\u00e4liseid salvestusseadmeid v\u00f5i v\u00e4ljaletsitud failis\u00fcsteemide kujutisi.<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 e2fsck, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u043f\u0430\u043a\u0435\u0442\u0430 e2fsprogs, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-5188), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0435\u0439 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0435 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0438. \u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u043e \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u0441 1.43.3 \u043f\u043e 1.45.4. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 e2fsck 1.45.5. \u0412 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u043a\u0430 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 (Debian, Arch Linux, SUSE\/openSUSE, Ubuntu, RHEL). 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