{"id":105318,"date":"2022-10-17T21:36:42","date_gmt":"2022-10-17T19:36:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg"},"modified":"2022-10-17T21:36:42","modified_gmt":"2022-10-17T19:36:42","slug":"uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"Zranite\u013enos\u0165 v LibKSBA, ved\u00faca k vykonaniu k\u00f3du pri spracovan\u00ed S\/MIME v GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V kni\u017enici LibKSBA, ktor\u00fa vyv\u00edja projekt GnuPG a ktor\u00e1 poskytuje funkcie na pr\u00e1cu so zariadeniami X.509, bola objaven\u00e1 kritick\u00e1 zranite\u013enos\u0165 (CVE-2022-3515), ktor\u00e1 vedie k prete\u010deniu cel\u00e9ho \u010d\u00edsla a z\u00e1pisu vo\u013en\u00fdch d\u00e1t mimo pridelen\u00e9ho vyrovn\u00e1vacieho priestoru pri anal\u00fdze \u0161trukt\u00far ASN.1 pou\u017eit\u00fdch v S\/MIME, X.509 a CMS. Probl\u00e9m je zhor\u0161en\u00fd t\u00fdm, \u017ee kni\u017enica Libksba sa pou\u017e\u00edva v bal\u00edku GnuPG a zranite\u013enos\u0165 m\u00f4\u017ee vies\u0165 k vzdialen\u00e9mu vykonaniu k\u00f3du \u00fato\u010dn\u00edka pri spracovan\u00ed v GnuPG (gpgsm) za\u0161ifrovan\u00fdch alebo podp\u00edsan\u00fdch d\u00e1t z s\u00faborov alebo e-mailov\u00fdch spr\u00e1v pou\u017e\u00edvaj\u00facich S\/MIME. V najjednoduch\u0161om pr\u00edpade na \u00fatok na obe\u0165 pou\u017e\u00edvaj\u00facu e-mailov\u00e9ho klienta s podporou GnuPG a S\/MIME sta\u010d\u00ed posla\u0165 \u0161peci\u00e1lne form\u00e1tovan\u00fd e-mail. <\/p>\n

Zranite\u013enos\u0165 sa m\u00f4\u017ee tie\u017e vyu\u017ei\u0165 na \u00fatok na servery dirmngr, ktor\u00e9 sa zaoberaj\u00fa s\u0165ahovan\u00edm a anal\u00fdzou zoznamov odvolan\u00fdch certifik\u00e1tov (CRLs) a verifik\u00e1ciou certifik\u00e1tov pou\u017e\u00edvan\u00fdch v TLS. \u00datok na dirmngr m\u00f4\u017ee by\u0165 vykonan\u00fd zo strany web servera<\/a>, pod kontrolou \u00fato\u010dn\u00edka, prostredn\u00edctvom poskytovania \u0161peci\u00e1lne form\u00e1tovan\u00fdch CRL alebo certifik\u00e1tov. Upozor\u0148uje sa, \u017ee verejne dostupn\u00e9 exploity pre gpgsm a dirmngr zatia\u013e neboli zisten\u00e9, ale zranite\u013enos\u0165 je typov\u00e1 a ni\u010d nebr\u00e1ni kvalifikovan\u00fdm \u00fato\u010dn\u00edkom pripravi\u0165 exploit samostatne. <\/p>\n

Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 vo vydan\u00ed Libksba 1.6.2 a v bin\u00e1rnych zostav\u00e1ch GnuPG 2.3.8. V distrib\u00faci\u00e1ch Linux je kni\u017enica Libksba zvy\u010dajne dod\u00e1van\u00e1 ako samostatn\u00e1 z\u00e1vislos\u0165, zatia\u013e \u010do v zostav\u00e1ch pre Windows je integrovan\u00e1 v hlavnom in\u0161tala\u010dnom bal\u00edku s GnuPG. Po aktualiz\u00e1cii nezabudnite re\u0161tartova\u0165 pozadov\u00e9 procesy pr\u00edkazom «gpgconf —kill all». Na overenie pr\u00edtomnosti probl\u00e9mu vo v\u00fdstupe pr\u00edkazu «gpgconf —show-versions» m\u00f4\u017eete pos\u00fadi\u0165 hodnotu riadku «KSBA ….», v ktorom by sa mala uv\u00e1dza\u0165 verzia nie ni\u017e\u0161ia ako 1.6.2. <\/p>\n

Aktualiz\u00e1cie pre distrib\u00facie zatia\u013e neboli vydan\u00e9, ale je mo\u017en\u00e9 ich sledova\u0165 na str\u00e1nkach: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. Zranite\u013enos\u0165 sa tie\u017e nach\u00e1dza v bal\u00edkoch MSI a AppImage s GnuPG VS-Desktop a v Gpg4win.
\n
Zdroj: 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 LibKSBA, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c GnuPG \u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u0430\u043c\u0438 X.509, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-3515), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440 ASN.1, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 S\/MIME, X.509 \u0438 CMS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0443\u0433\u0443\u0431\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 Libksba \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 GnuPG \u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a […]<\/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-105318","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\udd47Zranite\u013enos\u0165 v LibKSBA, ktor\u00e1 vedie k vykonaniu k\u00f3du pri spracovan\u00ed S\/MIME v GnuPG | ProHoster","description":"V kni\u017enici LibKSBA, ktor\u00fa vyv\u00edja projekt GnuPG a ktor\u00e1 poskytuje funkcie na pr\u00e1cu so zariadeniami X.509, bola objaven\u00e1 kritick\u00e1 zranite\u013enos\u0165 (CVE-2022-3515), ktor\u00e1 vedie k prete\u010deniu cel\u00e9ho \u010d\u00edsla a 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