{"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\/da\/blog\/news\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov","title":{"rendered":"S\u00e5rbarhed i Mozilla NSS, der muligg\u00f8r eksekvering af kode ved behandling af certifikater","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Der er opdaget en kritisk s\u00e5rbarhed (CVE-2021-43527) i kryptografibibliotekerne NSS (Network Security Services), udviklet af Mozilla, som kan f\u00f8re til udf\u00f8relse af ondsindet kode ved behandling af digitale DSA- eller RSA-PSS-underskrifter, der er angivet ved hj\u00e6lp af DER (Distinguished Encoding Rules) kodningsmetoden. Problemet, der er givet kodenavnet BigSig, er blevet rettet i versionerne NSS 3.73 og NSS ESR 3.68.1. Opdateringer til pakker i distributionerne er tilg\u00e6ngelige for Debian, RHEL, Ubuntu, SUSE, Arch Linux, Gentoo, FreeBSD. Opdateringer til Fedora er endnu ikke tilg\u00e6ngelige.    <\/p>\n<p> Problemet opst\u00e5r i applikationer, der bruger NSS til at behandle digitale CMS-, S\/MIME-, PKCS #7- og PKCS #12-underskrifter, eller ved validering af certifikater i implementeringer af TLS, X.509, OCSP og CRL. S\u00e5rbarheden kan dukke op i forskellige klient- og serverapplikationer med underst\u00f8ttelse af TLS, DTLS og S\/MIME, e-mailklienter og PDF-l\u00e6sere, der bruger NSS-funktionen CERT_VerifyCertificate() til at kontrollere digitale underskrifter.     <\/p>\n<p>Eksempler p\u00e5 s\u00e5rbare applikationer inkluderer LibreOffice, Evolution og Evince. Problemet kan ogs\u00e5 potentielt p\u00e5virke projekter som Pidgin, Apache OpenOffice, Suricata, Curl, Chrony, Red Hat Directory Server, Red Hat Certificate System, mod_nss til Apache HTTP-serveren, Oracle Communications Messaging Server, Oracle Directory Server Enterprise Edition. S\u00e5rbarheden optr\u00e6der ikke i Firefox, Thunderbird og Tor Browser, hvor der anvendes et separat bibliotek mozilla::pkix til validering, som ogs\u00e5 er en del af NSS. Browsere baseret p\u00e5 Chromium er heller ikke udsat (medmindre de er specifikt bygget med NSS), da de brugte NSS frem til 2015, men derefter blev overf\u00f8rt til BoringSSL.    <\/p>\n<p>S\u00e5rbarheden skyldes en fejl i koden til validering af certifikater i funktionen vfy_CreateContext fra filen secvfy.c. Fejlen opst\u00e5r b\u00e5de ved l\u00e6sning af klientens certifikat fra serveren samt ved behandling <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/dts-prohoster\/\"   title=\"serveren\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3028\">serveren<\/a> af klienters certifikater. Under valideringen af en digital underskrift, der er kodet med DER-metoden, dekoder NSS underskriften til en buffer med fast st\u00f8rrelse og sender denne buffer til PKCS #11-modulet. Ved videre behandling bliver st\u00f8rrelsen for DSA- og RSA-PSS-underskrifter ikke korrekt kontrolleret, hvilket f\u00f8rer til buffer-overl\u00f8b for den tildelte struktur VFYContextStr, hvis st\u00f8rrelsen p\u00e5 den digitale underskrift overstiger 16384 bits (2048 bytes er tildelt til bufferen, men det kontrolleres ikke, at underskriften kan v\u00e6re st\u00f8rre).    <\/p>\n<p>Kode med s\u00e5rbarhed kan spores tilbage til 2003, men det udgjorde ikke en trussel f\u00f8r refaktoreringen i 2012. I 2017 blev den samme fejl beg\u00e5et ved implementeringen af st\u00f8tte til RSA-PSS. For at udf\u00f8re et angreb kr\u00e6ves der ikke ressourcekr\u00e6vende generering af bestemte n\u00f8gler for at f\u00e5 de n\u00f8dvendige data, da bufferoverl\u00f8bet sker i fasen f\u00f8r kontrol af digitale signaturer. Data, der overskrider gr\u00e6nserne, skrives ind i et hukommelsesomr\u00e5de, der indeholder funktionspegere, hvilket letter oprettelsen af fungerende exploits.    <\/p>\n<p>S\u00e5rbarheden blev opdaget af forskere fra Google Project Zero under eksperimenter med nye metoder til fuzzing-testning og er et godt eksempel p\u00e5, hvordan trivielle s\u00e5rbarheder kan forblive uopdagede i et velafpr\u00f8vet, kendt projekt i lang tid:  <\/p>\n<ul>\n<li class=\"l\"> NSS-kode er ledsaget af et erfarent team, der har ansvaret for sikkerhed, som anvender moderne metoder til testning og fejlanalyse. Der er flere programmer med betydelige bel\u00f8nninger for at finde s\u00e5rbarheder i NSS.\n<li class=\"l\">  NSS var et af de f\u00f8rste projekter, der tilsluttede sig Google OSS-fuzz-initiativer og blev ogs\u00e5 testet i Mozillas udviklede fuzzing-testningssystem baseret p\u00e5 libFuzzer.\n<li class=\"l\"> Koden i biblioteket er blevet kontrolleret gentagne gange af forskellige statiske analysev\u00e6rkt\u00f8jer, herunder siden 2008, hvor den er blevet overv\u00e5get af Coverity.\n<li class=\"l\"> Indtil 2015 blev NSS brugt i Google Chrome og blev uafh\u00e6ngigt kontrolleret af Google-teamet (siden 2015 er Chrome skiftet til BoringSSL, men underst\u00f8ttelsen af porten baseret p\u00e5 NSS opretholdes).    <\/ul>\n<p>De v\u00e6sentligste problemer, som gjorde, at s\u00e5rbarheden forblev uopdaget i lang tid:  <\/p>\n<ul>\n<li class=\"l\"> NSS modulbibliotek og fuzzing-testning blev ikke udf\u00f8rt som helhed, men p\u00e5 niveauet af individuelle komponenter. For eksempel blev koden til dekodning af DER og behandling af certifikater testet separat \u2014 under fuzzing-testen kunne der meget vel v\u00e6re blevet genereret et certifikat, der f\u00f8rte til fremkomsten af den betragtede s\u00e5rbarhed, men dets kontrol kom ikke videre til verifikationskoden, og problemet blev dermed ikke opdaget.\n<li class=\"l\"> Under fuzzing testing, strict output size limits were set (10,000 bytes) while no such restrictions existed in NSS (many structures in normal mode could exceed 10,000 bytes, so a larger volume of input data was needed to identify issues). For a complete check, the limit should have been 224-1 bytes (16 MB), which corresponds to the maximum certificate size allowed in TLS.\n<li class=\"l\"> There was a misunderstanding regarding the coverage of code through fuzzing testing. Vulnerable code was actively tested, but using fuzzers that were unable to generate the required input data. For example, the fuzzer tls_server_target utilized a predefined set of ready-made certificates, which limited the verification code testing to only TLS messages and changes in protocol state.    <\/ul>\n<p>Kilde: <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 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execution during certificate processing | ProHoster","description":"A critical vulnerability (CVE-2021-43527) has been identified in the NSS (Network Security Services) cryptographic libraries developed by Mozilla, which may allow an attacker to execute code.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-mozilla-nss-pozvolyayushhaya-vypolnit-kod-pri-obrabotke-sertifikatov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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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