{"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\/nl\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"Kwetsbaarheid in LibKSBA die kan leiden tot code-executie bij S\/MIME-verwerking in GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In de LibKSBA-bibliotheek, ontwikkeld door het GnuPG-project en biedt functies voor het werken met X.509-certificaten, is een kritieke kwetsbaarheid (CVE-2022-3515) ontdekt, die leidt tot een integer overflow en het overschrijven van willekeurige gegevens buiten de toegewezen buffer bij het parseren van ASN.1-structuren die worden gebruikt in S\/MIME, X.509 en CMS. Het probleem wordt verergerd doordat de Libksba-bibliotheek wordt gebruikt in het GnuPG-pakket en de kwetsbaarheid kan leiden tot remote code execution van de aanvaller bij het verwerken van versleutelde of ondertekende gegevens in GnuPG (gpgsm) vanuit bestanden of e-mails die S\/MIME gebruiken. In het eenvoudigste geval is het voldoende om een speciaal opgemaakte e-mail te sturen naar een slachtoffer dat een e-mailclient met GnuPG en S\/MIME ondersteunt. <\/p>\n

De kwetsbaarheid kan ook worden gebruikt voor aanvallen op dirmngr-servers die verantwoordelijk zijn voor het downloaden en parseren van lijsten met ingetrokken certificaten (CRL's) en het verifi\u00ebren van certificaten die worden toegepast in TLS. Een aanval op dirmngr kan worden uitgevoerd vanuit webserver<\/a>, gecontroleerd door de aanvaller, door speciaal opgemaakte CRL's of certificaten af te geven. Er is opgemerkt dat er momenteel geen publiek beschikbare exploits voor gpgsm en dirmngr zijn, maar de kwetsbaarheid is type-specifiek en er staat niets een gekwalificeerde aanvaller in de weg om zelf een exploit voor te bereiden. <\/p>\n

De kwetsbaarheid is opgelost in de release van Libksba 1.6.2 en in de binaire builds van GnuPG 2.3.8. In Linux-distributies wordt de Libksba-bibliotheek meestal als een aparte afhankelijkheid geleverd, terwijl deze in Windows-builds is ge\u00efntegreerd in het hoofdinstallatiepakket met GnuPG. Vergeet niet om na de update de achtergrondprocessen opnieuw op te starten met het commando «gpgconf —kill all». Om te controleren of het probleem aanwezig is, kan je de uitvoer van het commando «gpgconf —show-versions» bekijken en specifiek de regel «KSBA ….» beoordelen, waarin de versie vermeld moet staan die niet lager is dan 1.6.2. <\/p>\n

Updates voor de distributies zijn nog niet uitgebracht, maar u kunt de beschikbaarheid ervan volgen op de pagina's: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. De kwetsbaarheid is ook aanwezig in de MSI- en AppImage-pakketten met GnuPG VS-Desktop en in Gpg4win.
\n
Bron: 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\udd47 Kwetsbaarheid in LibKSBA, die leidt tot code-executie bij de verwerking van S\/MIME in GnuPG | ProHoster","description":"In de LibKSBA-bibliotheek, ontwikkeld door het GnuPG-project en biedt functies voor het werken met X.509-certificaten, is een kritieke kwetsbaarheid (CVE-2022-3515) ontdekt, die leidt tot een integer overflow en 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