{"id":123495,"date":"2025-04-14T09:05:08","date_gmt":"2025-04-14T07:05:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/perepolnenie-bufera-v-perl-svyazannoe-s-obrabotkoj-simvolov"},"modified":"2025-04-14T09:05:08","modified_gmt":"2025-04-14T07:05:08","slug":"perepolnenie-bufera-v-perl-svyazannoe-s-obrabotkoj-simvolov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/perepolnenie-bufera-v-perl-svyazannoe-s-obrabotkoj-simvolov","title":{"rendered":"P\u0159ete\u010den\u00ed buffru v Perlu spojen\u00e9 s zpracov\u00e1n\u00edm znak\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly zve\u0159ejn\u011bny opravn\u00e9 aktualizace interpretru Perl 5.40.2 a 5.38.4, ve kter\u00fdch byla odstran\u011bna zranitelnost (CVE-2024-56406), vedouc\u00ed k p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku p\u0159i transliteraci speci\u00e1ln\u011b form\u00e1tovan\u00fdch ne-ASCII znak\u016f pomoc\u00ed oper\u00e1toru «tr....\/....\/». Nen\u00ed vylou\u010deno, \u017ee by zranitelnost mohla b\u00fdt zneu\u017eita k proveden\u00ed vlastn\u00edho k\u00f3du v syst\u00e9mu. Probl\u00e9m se projevuje ve stabiln\u00edch verz\u00edch Perl od roku 2021 a t\u00fdk\u00e1 se v\u011btv\u00ed Perl 5.34, 5.36, 5.38 a 5.40. O odstran\u011bn\u00ed zranitelnosti v distribuc\u00edch se m\u016f\u017eete informovat na n\u00e1sleduj\u00edc\u00edch str\u00e1nk\u00e1ch: Debian, Ubuntu, Fedora, Arch, FreeBSD. Distribuce zalo\u017een\u00e9 na RHEL 9, SUSE 15 a openSUSE Leap 15.6 nejsou touto zranitelnost\u00ed ohro\u017eeny, proto\u017ee zahrnuj\u00ed verze Perl 5.32 a 5.26. <\/p>\n

Zranitelnost se t\u00fdk\u00e1 program\u016f, kter\u00e9 pou\u017e\u00edvaj\u00ed neov\u011b\u0159en\u00e1 extern\u00ed data na lev\u00e9 stran\u011b oper\u00e1toru «tr», kde je uvedena prom\u011bnn\u00e1 s daty pro nahrazen\u00ed znak\u016f (nap\u0159\u00edklad «$external_string =~ tr\/a\/b\/»). V zaji\u0161\u0165uj\u00edc\u00ed funkci oper\u00e1toru S_do_trans_invmap() doch\u00e1z\u00ed p\u0159i zpracov\u00e1n\u00ed n\u011bkter\u00fdch ne-ASCII byt\u016f k p\u0159\u00edstupu do pam\u011bti mimo vyhrazen\u00fd z\u00e1sobn\u00edk. K p\u0159ete\u010den\u00ed doch\u00e1z\u00ed, proto\u017ee n\u011bkter\u00e9 sekvence byt\u016f v p\u016fvodn\u00edm datov\u00e9m souboru mohou b\u00fdt p\u0159evedeny na sekvence UTF-8, kter\u00e9 vy\u017eaduj\u00ed dva byty nam\u00edsto jednoho. <\/p>\n

Je pozoruhodn\u00e9, \u017ee zranitelnost vznikla po zm\u011bn\u011b p\u0159idan\u00e9 v roce 2020, kter\u00e1 odstranila dodate\u010dnou kontrolu dostate\u010dn\u00e9ho p\u0159id\u011blen\u00ed pam\u011bti pod z\u00e1minkou, \u017ee p\u0159i v\u00fdpo\u010dtu velikosti je dostate\u010dn\u00e9 zaokrouhlen\u00ed velikosti nahoru. Pro kontrolu p\u0159\u00edtomnosti zranitelnosti m\u016f\u017eete spustit k\u00f3d: perl -e ‘$_ = «\x{FF}» x 1000000; tr\/\xFF\/\x{100}\/;’ Segmentation fault (core dumped)
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u0430 Perl 5.40.2 \u0438 5.38.4, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-56406), \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 \u0442\u0440\u0430\u043d\u0441\u043b\u0438\u0442\u0435\u0440\u0430\u0446\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u043d\u0435-ASCII \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 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\u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0432\u0435\u0442\u043a\u0438 Perl 5.34, 5.36, […]<\/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-123495","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\udd47P\u0159ete\u010den\u00ed bufferu v Perl, souvisej\u00edc\u00ed s \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 | ProHoster","description":"Byly zve\u0159ejn\u011bny opravy interpretru Perl 5.40.2 a 5.38.4, kter\u00e9 \u0159e\u0161\u00ed zranitelnost (CVE-2024-56406), vedouc\u00ed k p\u0159ete\u010den\u00ed bufferu p\u0159i transliteraci speci\u00e1ln\u011b form\u00e1tovan\u00fdch ne-ASCII.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/perepolnenie-bufera-v-perl-svyazannoe-s-obrabotkoj-simvolov","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\u041f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 Perl, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0435 \u0441 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