{"id":102446,"date":"2021-12-02T21:36:39","date_gmt":"2021-12-02T19:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov"},"modified":"2021-12-02T21:36:39","modified_gmt":"2021-12-02T19:36:39","slug":"uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov","title":{"rendered":"Sebezhet\u0151s\u00e9g a Mozilla NSS-ben, amely lehet\u0151v\u00e9 teszi a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t tan\u00fas\u00edtv\u00e1nyok feldolgoz\u00e1sa sor\u00e1n","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A Mozilla \u00e1ltal fejlesztett NSS (Network Security Services) kriptogr\u00e1fiai k\u00f6nyvt\u00e1rgy\u0171jtem\u00e9ny\u00e9ben kritikus sebezhet\u0151s\u00e9get (CVE-2021-43527) fedeztek fel, amely lehet\u0151v\u00e9 teheti a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t digit\u00e1lis al\u00e1\u00edr\u00e1sok DSA vagy RSA-PSS feldolgoz\u00e1sa sor\u00e1n, amelyeket DER (Distinguished Encoding Rules) k\u00f3dol\u00e1si m\u00f3dszerrel \u00e1ll\u00edtanak el\u0151. A BigSig k\u00f3dn\u00e9vvel ell\u00e1tott probl\u00e9m\u00e1t az NSS 3.73 \u00e9s az NSS ESR 3.68.1 verzi\u00f3kban jav\u00edtott\u00e1k. A Debian, RHEL, Ubuntu, SUSE, Arch Linux, Gentoo \u00e9s FreeBSD disztrib\u00faci\u00f3khoz el\u00e9rhet\u0151k a csomagfriss\u00edt\u00e9sek. Jelenleg a Fedora sz\u00e1m\u00e1ra nem el\u00e9rhet\u0151k friss\u00edt\u00e9sek.    <\/p>\n<p> A probl\u00e9ma azokban az alkalmaz\u00e1sokban jelentkezik, amelyek az NSS-t haszn\u00e1lj\u00e1k CMS, S\/MIME, PKCS #7 \u00e9s PKCS #12 digit\u00e1lis al\u00e1\u00edr\u00e1sok feldolgoz\u00e1s\u00e1ra, vagy tan\u00fas\u00edtv\u00e1nyok \u00e9rv\u00e9nyes\u00edt\u00e9s\u00e9re TLS, X.509, OCSP \u00e9s CRL megval\u00f3s\u00edt\u00e1sokban. A sebezhet\u0151s\u00e9g felmer\u00fclhet k\u00fcl\u00f6nb\u00f6z\u0151 \u00fcgyf\u00e9l- \u00e9s kiszolg\u00e1l\u00f3alkalmaz\u00e1sokban, amelyek t\u00e1mogatj\u00e1k a TLS-t, DTLS-t \u00e9s S\/MIME-t, valamint olyan levelez\u0151programokban \u00e9s PDF-olvas\u00f3kban, amelyek az NSS CERT_VerifyCertificate() h\u00edv\u00e1s\u00e1t haszn\u00e1lj\u00e1k a digit\u00e1lis al\u00e1\u00edr\u00e1sok ellen\u0151rz\u00e9s\u00e9re.     <\/p>\n<p>A sebezhet\u0151 alkalmaz\u00e1sok k\u00f6z\u00e9 tartozik a LibreOffice, az Evolution \u00e9s az Evince. A probl\u00e9ma potenci\u00e1lisan \u00e9rintheti a k\u00f6vetkez\u0151 projekteket is: Pidgin, Apache OpenOffice, Suricata, Curl, Chrony, Red Hat Directory Server, Red Hat Certificate System, mod_nss az Apache webkiszolg\u00e1l\u00f3 sz\u00e1m\u00e1ra, Oracle Communications Messaging Server \u00e9s az Oracle Directory Server Enterprise Edition. A Firefox, a Thunderbird \u00e9s a Tor Browser nem \u00e9rintett, mivel a hiteles\u00edt\u00e9shez k\u00fcl\u00f6n k\u00f6nyvt\u00e1rat, a mozilla::pkix-et haszn\u00e1lj\u00e1k, amely szint\u00e9n az NSS r\u00e9sze. A Chromium-alap\u00fa b\u00f6ng\u00e9sz\u0151k sem \u00e9rz\u00e9kenyek (ha nem kifejezetten NSS-sel ford\u00edtott\u00e1k \u0151ket), amelyek 2015 el\u0151tt haszn\u00e1lt\u00e1k az NSS-t, de az\u00f3ta BoringSSL-re \u00e1lltak \u00e1t.    <\/p>\n<p>A sebezhet\u0151s\u00e9g a tan\u00fas\u00edtv\u00e1nyok ellen\u0151rz\u00e9s\u00e9nek hib\u00e1j\u00e1b\u00f3l ad\u00f3dik a vfy_CreateContext funkci\u00f3ban, a secvfy.c f\u00e1jlban. A hiba a tan\u00fas\u00edtv\u00e1ny \u00fcgyf\u00e9l \u00e1ltali szerverr\u0151l val\u00f3 olvas\u00e1sakor \u00e9s a feldolgoz\u00e1s sor\u00e1n is megjelenik. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/dts-prohoster\/\"   title=\"szerverrel\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3028\">szerverrel<\/a> az \u00fcgyfelek tan\u00fas\u00edtv\u00e1nyaival kapcsolatban. A DER m\u00f3dszerrel k\u00f3dolt digit\u00e1lis al\u00e1\u00edr\u00e1s ellen\u0151rz\u00e9se sor\u00e1n az NSS egy r\u00f6gz\u00edtett m\u00e9ret\u0171 puffert dek\u00f3dol az al\u00e1\u00edr\u00e1sba, \u00e9s ezt a puffert tov\u00e1bb\u00edtja a PKCS #11 modulnak. A tov\u00e1bbi feldolgoz\u00e1s sor\u00e1n a DSA \u00e9s RSA-PSS al\u00e1\u00edr\u00e1sokn\u00e1l a m\u00e9retet hib\u00e1san ellen\u0151rzik, ami a VFYContextStr strukt\u00far\u00e1hoz tartoz\u00f3 puffer t\u00falcsordul\u00e1s\u00e1hoz vezet, ha a digit\u00e1lis al\u00e1\u00edr\u00e1s m\u00e9rete meghaladja a 16384 bitet (a puffer 2048 b\u00e1jt m\u00e9ret\u0171, de nem ellen\u0151rzik, hogy az al\u00e1\u00edr\u00e1s nagyobb m\u00e9ret\u0171 lehet).    <\/p>\n<p>A vulnerability in the code has been tracked since 2003, but it did not pose a threat until the refactoring conducted in 2012. In 2017, the same mistake occurred during the implementation of RSA-PSS support. The attack does not require resource-intensive generation of specific keys to obtain the necessary data, as the overflow occurs at a stage before the digital signature validity check. The overflowing data is written into the memory area that contains function pointers, making it easier to create functional exploits.    <\/p>\n<p>The vulnerability was identified by researchers from Google Project Zero during experiments with new fuzzing testing methods and serves as a good demonstration of how trivial vulnerabilities can remain unnoticed for a long time in a widely tested and well-known project.  <\/p>\n<ul>\n<li class=\"l\"> The NSS code is accompanied by an experienced security team that applies modern testing and debugging analysis methods. Several programs are in place to provide substantial rewards for discovering vulnerabilities in NSS.\n<li class=\"l\">  NSS was one of the first projects to join the Google oss-fuzz initiative and was also tested in Mozilla's fuzzing testing system based on libFuzzer.\n<li class=\"l\"> The library's code has been repeatedly checked against various static analyzers, including being monitored by Coverity since 2008.\n<li class=\"l\"> Until 2015, NSS was used in Google Chrome and was independently tested by the Google team (since 2015, Chrome has transitioned to BoringSSL, but support for the NSS-based port is maintained).    <\/ul>\n<p>The main issues that caused the problem to remain unnoticed for a long time:  <\/p>\n<ul>\n<li class=\"l\"> Az NSS modul\u00e1ris k\u00f6nyvt\u00e1r \u00e9s a fuzzing-tesztel\u00e9s nem az eg\u00e9sz szinten, hanem az egyes komponensek szintj\u00e9n zajlott. P\u00e9ld\u00e1ul k\u00fcl\u00f6n ellen\u0151rizt\u00e9k a DER dek\u00f3dol\u00f3 k\u00f3dj\u00e1t \u00e9s a tan\u00fas\u00edtv\u00e1nyok feldolgoz\u00e1s\u00e1t \u2014 a fuzzing sor\u00e1n lehets\u00e9ges volt olyan tan\u00fas\u00edtv\u00e1ny megszerz\u00e9se, amely a vizsg\u00e1lt s\u00e9r\u00fcl\u00e9kenys\u00e9g megjelen\u00e9s\u00e9t eredm\u00e9nyezhette, de ennek ellen\u0151rz\u00e9se nem jutott el a hiteles\u00edt\u00e9si k\u00f3dig, \u00e9s a probl\u00e9ma nem fedezhet\u0151 fel.\n<li class=\"l\"> A fuzzing test imposed strict output size limits (10,000 bytes) while no such constraints existed in NSS (many structures could, under normal conditions, exceed 10,000 bytes, necessitating a larger volume of input data to uncover issues). For a comprehensive check, the limit should have been 224-1 bytes (16 MB), corresponding to the maximum permissible certificate size in TLS.\n<li class=\"l\"> Incorrect understanding of code coverage during fuzzing testing. Vulnerable code was actively tested, but using fuzzers incapable of generating the necessary input data. For example, the fuzzer tls_server_target employed a predefined set of ready-made certificates, which restricted the verification code testing to TLS messages and protocol state transitions.    <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56268\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043d\u0430\u0431\u043e\u0440\u0435 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a NSS (Network Security Services), \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Mozilla, \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-2021-43527), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 DSA \u0438\u043b\u0438 RSA-PSS, \u0437\u0430\u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u0435\u0442\u043e\u0434\u0430 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f DER (Distinguished Encoding Rules). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430, \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f BigSig, \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 NSS 3.73 \u0438 NSS ESR 3.68.1. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 [&hellip;]<\/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-102446","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043d\u0430\u0431\u043e\u0440\u0435 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a NSS (Network Security Services), \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Mozilla, \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-2021-43527), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u043f\u0440\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov\" \/>\n\t\t<meta name=\"generator\" content=\"All 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execution during certificate processing | ProHoster","description":"A critical vulnerability (CVE-2021-43527) has been discovered in the NSS (Network Security Services) cryptographic library set developed by Mozilla, which may allow an attacker to execute code.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Mozilla NSS, 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