{"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\/cs\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"Zranitelnost v LibKSBA, kter\u00e1 vede k vykon\u00e1v\u00e1n\u00ed k\u00f3du p\u0159i zpracov\u00e1n\u00ed S\/MIME v GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V knihovn\u011b LibKSBA, vyv\u00edjen\u00e9 projektem GnuPG a poskytuj\u00edc\u00ed funkce pro pr\u00e1ci s certifik\u00e1ty X.509, byla zji\u0161t\u011bna kritick\u00e1 zranitelnost (CVE-2022-3515), kter\u00e1 vede k p\u0159ete\u010den\u00ed cel\u00e9ho \u010d\u00edsla a z\u00e1pisu libovoln\u00fdch dat za hranice vyhrazen\u00e9ho bufferu p\u0159i anal\u00fdze struktur ASN.1 pou\u017e\u00edvan\u00fdch ve S\/MIME, X.509 a CMS. Probl\u00e9m je umocn\u011bn t\u00edm, \u017ee knihovna Libksba je pou\u017e\u00edv\u00e1na v bal\u00edc\u00ed GnuPG a zranitelnost m\u016f\u017ee v\u00e9st k vzd\u00e1len\u00e9mu vykon\u00e1n\u00ed k\u00f3du \u00fato\u010dn\u00edka p\u0159i zpracov\u00e1n\u00ed v GnuPG (gpgsm) za\u0161ifrovan\u00fdch nebo podepsan\u00fdch dat z soubor\u016f nebo e-mailov\u00fdch zpr\u00e1v vyu\u017e\u00edvaj\u00edc\u00edch S\/MIME. V nejjednodu\u0161\u0161\u00edm p\u0159\u00edpad\u011b je pro \u00fatok na ob\u011b\u0165, kter\u00e1 pou\u017e\u00edv\u00e1 po\u0161tovn\u00edho klienta s podporou GnuPG a S\/MIME, dostate\u010dn\u00e9 poslat speci\u00e1ln\u011b vytvo\u0159en\u00fd e-mail. <\/p>\n

Zranitelnost lze tak\u00e9 vyu\u017e\u00edt pro \u00fatoky na servery dirmngr, kter\u00e9 se zab\u00fdvaj\u00ed stahov\u00e1n\u00edm a anal\u00fdzou seznam\u016f odvolan\u00fdch certifik\u00e1t\u016f (CRLs) a ov\u011b\u0159ov\u00e1n\u00edm certifik\u00e1t\u016f pou\u017e\u00edvan\u00fdch v TLS. \u00datok na dirmngr m\u016f\u017ee b\u00fdt proveden z webov\u00e9ho serveru<\/a>, \u00fato\u010dn\u00edkem kontrolovan\u00e9, pomoc\u00ed dod\u00e1n\u00ed speci\u00e1ln\u011b vytvo\u0159en\u00fdch CRL nebo certifik\u00e1t\u016f. Lze konstatovat, \u017ee ve\u0159ejn\u011b dostupn\u00e9 exploity pro gpgsm a dirmngr zat\u00edm nebyly identifikov\u00e1ny, ale zranitelnost je typov\u00e1 a nic nebr\u00e1n\u00ed kvalifikovan\u00fdm \u00fato\u010dn\u00edk\u016fm p\u0159ipravit exploit samostatn\u011b. <\/p>\n

Zranitelnost byla odstran\u011bna ve vyd\u00e1n\u00ed Libksba 1.6.2 a v bin\u00e1rn\u00edch sestaven\u00edch GnuPG 2.3.8. V distribuc\u00edch Linuxu je knihovna Libksba obvykle dod\u00e1v\u00e1na jako samostatn\u00e1 z\u00e1vislost, zat\u00edmco v sestaven\u00edch pro Windows je integrov\u00e1na do hlavn\u00edho instala\u010dn\u00edho bal\u00ed\u010dku s GnuPG. Po aktualizaci nezapome\u0148te restartovat pozad\u00ed pomoc\u00ed p\u0159\u00edkazu «gpgconf —kill all». Pro kontrolu p\u0159\u00edtomnosti probl\u00e9mu m\u016f\u017eete v\u00fdstupem p\u0159\u00edkazu «gpgconf —show-versions» zjistit hodnotu \u0159et\u011bzce «KSBA ….», ve kter\u00e9 by m\u011bla b\u00fdt uvedena verze nejm\u00e9n\u011b 1.6.2. <\/p>\n

Aktualizace pro distribuce zat\u00edm nebyly vyd\u00e1ny, ale m\u016f\u017eete sledovat jejich dostupnost na str\u00e1nk\u00e1ch: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. Zranitelnost se tak\u00e9 nach\u00e1z\u00ed v bal\u00edc\u00edch 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\udd47Zranitelnost v LibKSBA, kter\u00e1 umo\u017e\u0148uje prov\u00e1d\u011bn\u00ed k\u00f3du p\u0159i zpracov\u00e1n\u00ed S\/MIME v GnuPG | ProHoster","description":"V knihovn\u011b LibKSBA, vyv\u00edjen\u00e9 projektem GnuPG a poskytuj\u00edc\u00ed funkce pro pr\u00e1ci s certifik\u00e1ty X.509, byla zji\u0161t\u011bna kritick\u00e1 zranitelnost (CVE-2022-3515), kter\u00e1 vede k p\u0159ete\u010den\u00ed cel\u00e9ho 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