{"id":123408,"date":"2025-04-04T15:05:07","date_gmt":"2025-04-04T13:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti"},"modified":"2025-04-04T15:05:07","modified_gmt":"2025-04-04T13:05:07","slug":"obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/obnovlenie-xz-utils-5-8-1-s-ustraneniem-uyazvimosti","title":{"rendered":"Aktualiz\u00e1cia XZ Utils 5.8.1 s opravou zranite\u013enosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bol vydan\u00e1 verzia bal\u00edka XZ Utils 5.8.1, ktor\u00e1 obsahuje kni\u017enicu liblzma a n\u00e1stroje na pr\u00e1cu so s\u00fabormi komprimovan\u00fdmi vo form\u00e1te . XZ Utils 5.8.1 sa stal prv\u00fdm v\u00fdznamn\u00fdm vydan\u00edm po incidente odhalenia zadn\u00e9ho vchodu, ktor\u00fd umo\u017e\u0148oval pr\u00edstup cez sshd. Minul\u00fd t\u00fd\u017ede\u0148 bol vytvoren\u00fd tag 5.8.0 v Gite, ale vydanie nebolo ofici\u00e1lne ozn\u00e1men\u00e9 kv\u00f4li zistenej probl\u00e9mom s v\u00fdkonom a kompatibilitou so star\u0161\u00edmi verziami GNU make.    <\/p>\n<p>V aktualiz\u00e1cii XZ Utils 5.8.1 bola odstr\u00e1nen\u00e1 zranite\u013enos\u0165 (CVE-2025-31115), ktor\u00e1 sp\u00f4sobovala hav\u00e1riu pri pokuse o rozbalenie \u0161peci\u00e1lne upraven\u00fdch arch\u00edvov. Zranite\u013enos\u0165 bola sp\u00f4soben\u00e1 pr\u00edstupom k u\u017e uvo\u013enenej oblast\u00ed pam\u00e4te (use after free). \u00dato\u010dn\u00edk m\u00f4\u017ee dosiahnu\u0165 zap\u00edsanie svojej hodnoty na adresu vypo\u010d\u00edtan\u00fa ako . Probl\u00e9m je pova\u017eovan\u00fd za ne\u00famyseln\u00fa chybu, preto\u017ee zmena, ktor\u00e1 ju sp\u00f4sobila, bola do k\u00f3du zaveden\u00e1 dlho pred pr\u00edchodom v\u00fdvoj\u00e1ra Jia Tan, ktor\u00e9ho \u010dinnos\u0165 viedla k zaviedeniu zadn\u00e9ho vchodu.      <\/p>\n<p>Probl\u00e9m sa prejavuje od vydania XZ Utils 5.3.3alpha pri dek\u00f3dovan\u00ed v multithreadovom re\u017eime (jednovl\u00e1knov\u00fd dekod\u00e9r probl\u00e9m neovplyv\u0148uje). Okrem \u0161tandardn\u00fdch n\u00e1strojov z bal\u00edka xz sa zranite\u013enos\u0165 prejavuje aj v extern\u00fdch programoch, ktor\u00e9 pou\u017e\u00edvaj\u00fa funkciu lzma_stream_decoder_mt z kni\u017enice liblzma. Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 vo verzii XZ Utils 5.8.1 a taktie\u017e bola prenesen\u00e1 do stabiln\u00fdch vetiev 5.4 a 5.6. Sledova\u0165 aktualiz\u00e1cie v distrib\u00faci\u00e1ch m\u00f4\u017eete na nasleduj\u00facich str\u00e1nkach: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Ako obch\u00e1dzkov\u00e9 rie\u0161enie ochrany m\u00f4\u017eete vypn\u00fa\u0165 dek\u00f3dovanie s\u00faborov v multithreadovom re\u017eime, a to spusten\u00edm xz s vo\u013ebami  alebo pou\u017eit\u00edm n\u00e1stroja xzdec.    <\/p>\n<p>Medzi funk\u010dn\u00e9 zmeny v vetve XZ Utils 5.8 mo\u017eno spomen\u00fa\u0165:  <\/p>\n<ul>\n<li class=\"l\"> Do dekod\u00e9ra LZMA\/LZMA2 bola pridan\u00e1 mo\u017enos\u0165 vyu\u017eitia in\u0161trukci\u00ed SSE2 namiesto funkcie memcpy() na 32- a 64-bitov\u00fdch syst\u00e9moch x86. Zmena umo\u017enila skr\u00e1ti\u0165 \u010das dek\u00f3dovania o 5% pri zostaven\u00ed s Glibc a o 15% pri zostaven\u00ed s musl pri rozba\u013eovan\u00ed s\u00faborov s ve\u013emi vysok\u00fdm stup\u0148om kompresie.\n<li class=\"l\"> V liblzma bola zv\u00fd\u0161en\u00e1 r\u00fdchlos\u0165 k\u00f3dovania na 64-bitov\u00fdch syst\u00e9moch PowerPC a RISC-V.\n<li class=\"l\"> Do lzma\/bcj.h bol pridan\u00fd n\u00edzko\u00farov\u0148ov\u00fd API BCJ filtrov (Branch\/Call\/Jump) pre syst\u00e9my RISC-V, ARM64 a x86.\n<li class=\"l\"> K\u00f3d v\u00fdpo\u010dtu CLMUL CRC pre syst\u00e9my x86, x86-64 a E2K bol prepracovan\u00fd.\n<li class=\"l\"> Na platform\u00e1ch s procesormi LoongArch s\u00fa vyu\u017e\u00edvan\u00e9 in\u0161trukcie na zr\u00fdchlenie v\u00fdpo\u010dtu kontroln\u00fdch s\u00fa\u010dtov CRC32.\n<li class=\"l\"> V n\u00e1stroji  bola zabezpe\u010den\u00e1 v\u00fdzva na funkciu fsync() na vypr\u00e1zdnenie s\u00faborov\u00fdch cache pre v\u00fdsledn\u00fd s\u00fabor pred odstr\u00e1nen\u00edm p\u00f4vodn\u00e9ho s\u00faboru. Pre vypnutie synchroniz\u00e1cie pred odstr\u00e1nen\u00edm bola implementovan\u00e1 vo\u013eba .\n<li class=\"l\"> V utilit\u00e1ch xz, xzdec a lzmainfo pri vypisovan\u00ed inform\u00e1ci\u00ed na obrazovku je zabezpe\u010den\u00e9 nahradenie nevidite\u013en\u00fdch znakov znakom ot\u00e1zky.\n<li class=\"l\"> V xz a xzdec na platforme Linux je pre izol\u00e1ciu procesu implementovan\u00e1 podpora 5 a 6 verzi\u00ed mechanizmu Landlock.\n<li class=\"l\"> Pridan\u00fd skript na kontrolu licenci\u00ed build-aux\/license-check.sh.\n<li class=\"l\"> Skripty lzcmp, lzdiff, lzless, lzmore, lzgrep, lzegrep a lzfgrep, realizovan\u00e9 ako nadstavby nad utilitou xz, s\u00fa vyhl\u00e1sen\u00e9 za zastaran\u00e9.      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63017\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u043e \u0441\u0436\u0430\u0442\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 &#171;.xz&#187;. XZ Utils 5.8.1 \u0441\u0442\u0430\u043b \u043f\u0435\u0440\u0432\u044b\u043c \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u043e\u043c \u043f\u043e\u0441\u043b\u0435 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430 \u0441 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u0431\u044d\u043a\u0434\u043e\u0440\u0430, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u0432\u0445\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 sshd. \u041d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435 \u0432 Git \u0431\u044b\u043b \u0441\u043e\u0437\u0434\u0430\u043d \u0442\u0435\u0433 5.8.0, \u043d\u043e \u0440\u0435\u043b\u0438\u0437 \u043d\u0435 \u0431\u044b\u043b \u043e\u0431\u044a\u044f\u0432\u043b\u0435\u043d \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0438\u0437-\u0437\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043f\u043e\u0441\u043b\u0435 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0442\u0435\u0433\u0430 [&hellip;]<\/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-123408","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0430\u043a\u0435\u0442\u0430 XZ Utils 5.8.1, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 liblzma \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0434\u043b\u044f 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