{"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\/da\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"En s\u00e5rbarhed i LibKSBA, der f\u00f8rer til udf\u00f8relse af kode ved behandling af S\/MIME i GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I biblioteket LibKSBA, udviklet af GnuPG-projektet og som tilbyder funktioner til arbejde med X.509-certifikater, er der identificeret en kritisk s\u00e5rbarhed (CVE-2022-3515), som f\u00f8rer til integer overflow og skrivning af vilk\u00e5rlige data uden for den tildelte buffer ved parsing af ASN.1-strukturer, der anvendes i S\/MIME, X.509 og CMS. Problemet forv\u00e6rres af, at Libksba-biblioteket bruges i GnuPG-pakken, og s\u00e5rbarheden kan f\u00f8re til fjernudf\u00f8relse af onde kode ved behandling af krypterede eller signerede data fra filer eller e-mails, der anvender S\/MIME. I enkleste tilf\u00e6lde for at angribe et offer, der bruger en e-mail-klient med GnuPG og S\/MIME-support, er det tilstr\u00e6kkeligt at sende en specielt udformet e-mail. <\/p>\n

S\u00e5rbarheden kan ogs\u00e5 udnyttes til at angribe dirmngr-servere, der h\u00e5ndterer download og parsing af revokerede certifikatlister (CRL'er) og verifikation af certifikater, der anvendes i TLS. Angrebet p\u00e5 dirmngr kan udf\u00f8res fra webserveren<\/a>, en server kontrolleret af en hacker, ved at sende specielt udformede CRL'er eller certifikater. Det bem\u00e6rkes, at der endnu ikke er identificeret offentligt tilg\u00e6ngelige exploits for gpgsm og dirmngr, men s\u00e5rbarheden er typisk, og der er intet, der forhindrer kvalificerede angribere i at forberede en exploit selv. <\/p>\n

S\u00e5rbarheden er blevet udbedret i version 1.6.2 af Libksba og i de bin\u00e6re samlinger af GnuPG 2.3.8. I Linux-distributioner leveres Libksba typisk som en separat afh\u00e6ngighed, mens den i samlinger til Windows er inkluderet i hovedinstallationspakken med GnuPG. Efter opdateringen skal du huske at genstarte baggrundsprocesserne med kommandoen «gpgconf —kill all». For at kontrollere om problemet stadig er til stede, kan du vurdere udgangen af kommandoen «gpgconf —show-versions», hvor v\u00e6rdien af linjen «KSBA ….» skal angive en version, der ikke er lavere end 1.6.2. <\/p>\n

Opdateringer til distributioner er endnu ikke udgivet, men man kan f\u00f8lge med i deres komme p\u00e5 siderne: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. S\u00e5rbarheden er ogs\u00e5 til stede i MSI- og AppImage-pakkerne med GnuPG VS-Desktop og Gpg4win.
\n
Kilde: 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\udd47S\u00e5rbarhed i LibKSBA, der f\u00f8rer til kodeudf\u00f8relse ved behandling af S\/MIME i GnuPG | ProHoster","description":"I biblioteket LibKSBA, udviklet af GnuPG-projektet og som tilbyder funktioner til arbejde med X.509-certifikater, er der identificeret en kritisk s\u00e5rbarhed (CVE-2022-3515), som f\u00f8rer til integer overflow og 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