{"id":53107,"date":"2019-11-24T00:00:00","date_gmt":"2019-11-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc"},"modified":"2020-02-18T14:00:58","modified_gmt":"2020-02-18T11:00:58","slug":"37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","title":{"rendered":"37 s\u00e5rbarheder i forskellige implementeringer af VNC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pavel Cheremushkin fra Kaspersky Lab har analyseret<\/a><\/noindex> forskellige implementeringer af VNC (Virtual Network Computing) fjernadgangssystemet og identificeret 37 s\u00e5rbarheder, der skyldes problemer med hukommelsen. S\u00e5rbarhederne i VNC-serverimplementeringerne kan kun udnyttes af en autentificeret bruger, mens angreb p\u00e5 s\u00e5rbarheder i klientkoden kan finde sted, n\u00e5r brugeren er forbundet til en server, der er kontrolleret af en angriber.<\/p>\n

Det st\u00f8rste antal s\u00e5rbarheder er fundet i pakken UltraVNC<\/a><\/noindex>, som kun er tilg\u00e6ngelig for Windows-platformen. I alt er 22 s\u00e5rbarheder blevet identificeret i UltraVNC. 13 s\u00e5rbarheder kan potentielt f\u00f8re til udf\u00f8relse af kode i systemet, 5 til l\u00e6kage af indhold fra hukommelsesomr\u00e5der, og 4 til nedbrud.
\nS\u00e5rbarhederne er blevet l\u00f8st i udgaven 1.2.3.0<\/a><\/noindex>.<\/p>\n

I det \u00e5bne bibliotek LibVNC<\/a><\/noindex> (LibVNCServer og LibVNCClient), som kun 14,3% af webstederne i hele verden.<\/a><\/noindex> i VirtualBox, er der fundet 10 s\u00e5rbarheder.
\n5 s\u00e5rbarheder (CVE-2018-20020<\/a><\/noindex>, CVE-2018-20019<\/a><\/noindex>, CVE-2018-15127<\/a><\/noindex>, CVE-2018-15126<\/a><\/noindex>, CVE-2018-6307<\/a><\/noindex>) skyldes bufferoverl\u00f8b og kan potentielt f\u00f8re til udf\u00f8relse af kode. 3 s\u00e5rbarheder kan f\u00f8re til datal\u00e6kage, 2 til nedbrud.
\nAlle problemer er allerede blevet l\u00f8st af udviklerne, men \u00e6ndringerne er stadig reflekteret<\/a><\/noindex> kun i master-grenen.<\/p>\n

I TightVNC<\/a><\/noindex> (den tv\u00e6rplatformsm\u00e6ssige for\u00e6ldede gren blev testet, 1.3<\/a><\/noindex>da den aktuelle version 2.x kun udgives til Windows), er der fundet 4 s\u00e5rbarheder. Tre problemer (CVE-2019-15679<\/a><\/noindex>, CVE-2019-15678<\/a><\/noindex>, CVE-2019-8287<\/a><\/noindex>) skyldes bufferoverl\u00f8b i funktionerne InitialiseRFBConnection, rfbServerCutText og HandleCoRREBBP og kan potentielt f\u00f8re til udf\u00f8relse af kode. Et problem (CVE-2019-15680<\/a><\/noindex>) f\u00f8rer til nedbrud. Selvom udviklerne af TightVNC blev underrettet<\/a><\/noindex> om problemerne allerede sidste \u00e5r, forbliver s\u00e5rbarhederne uoprettede.<\/p>\n

I den tv\u00e6rplatformsm\u00e6ssige pakke TurboVNC<\/a><\/noindex> (en fork af TightVNC 1.3, der bruger bibliotekerne libjpeg-turbo), blev der kun fundet \u00e9n s\u00e5rbarhed (CVE-2019-15683<\/a><\/noindex>), men den er farlig, og med autentificeret adgang til serveren giver den mulighed for at udf\u00f8re sin egen kode, da der ved bufferoverl\u00f8b er mulighed for at kontrollere returadressen. Problemet er l\u00f8st den 23. august<\/a><\/noindex> og findes ikke i den aktuelle udgave. 2.2.3<\/a><\/noindex>.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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