{"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\/sv\/blog\/news\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","title":{"rendered":"37 s\u00e5rbarheter i olika implementationer av VNC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pavel T\u0161eremushkin fr\u00e5n Kaspersky Lab analyserade<\/a><\/noindex> olika implementeringar av VNC (Virtual Network Computing) fj\u00e4rr\u00e5tkomstsystemet och identifierade 37 s\u00e5rbarheter relaterade till problem med minneshantering. S\u00e5rbarheterna som uppt\u00e4cktes i VNC-serverimplementationerna kan endast utnyttjas av autentiserade anv\u00e4ndare, medan attacker mot s\u00e5rbarheterna i klientkoden \u00e4r m\u00f6jliga n\u00e4r en anv\u00e4ndare ansluter till en server som kontrolleras av en angripare.<\/p>\n

Det st\u00f6rsta antalet s\u00e5rbarheter hittades i paketet UltraVNC<\/a><\/noindex>, som endast \u00e4r tillg\u00e4ngligt f\u00f6r Windows-plattformen. Totalt har 22 s\u00e5rbarheter identifierats i UltraVNC. 13 s\u00e5rbarheter kan potentiellt leda till kodexekvering i systemet, 5 kan leda till l\u00e4ckage av minnesinneh\u00e5ll och 4 kan orsaka \u00f6verbelastning.
\nS\u00e5rbarheterna har \u00e5tg\u00e4rdats i versionen 1.2.3.0<\/a><\/noindex>.<\/p>\n

I det \u00f6ppna biblioteket LibVNC<\/a><\/noindex> (LibVNCServer och LibVNCClient), som funktionen unix_crypt, som tar emot det l\u00f6senord som anv\u00e4ndaren anger utan att utf\u00f6ra escape av specialtecken. I git-repositoriet<\/a><\/noindex> finns i VirtualBox, har 10 s\u00e5rbarheter identifierats.
\n5 s\u00e5rbarheter (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>) orsakas av buffert\u00f6verskridning och kan potentiellt leda till kodexekvering. 3 s\u00e5rbarheter kan leda till informationsl\u00e4ckage, 2 kan orsaka avbrott i tj\u00e4nsten.
\nAlla problem har redan \u00e5tg\u00e4rdats av utvecklarna, men \u00e4ndringarna \u00e4r \u00e4nnu reflekterade<\/a><\/noindex> endast i master-grenen.<\/p>\n

I TightVNC<\/a><\/noindex> (den plattforms\u00f6vergripande, f\u00f6r\u00e5ldrade grenen testades, 1.3<\/a><\/noindex>eftersom den aktuella versionen 2.x endast sl\u00e4pps f\u00f6r Windows), identifierade 4 s\u00e5rbarheter. Tre problem (CVE-2019-15679<\/a><\/noindex>, CVE-2019-15678<\/a><\/noindex>, CVE-2019-8287<\/a><\/noindex>) orsakas av buffert\u00f6verskridning i funktionerna InitialiseRFBConnection, rfbServerCutText och HandleCoRREBBP och kan potentiellt leda till kodexekvering. Ett problem (CVE-2019-15680<\/a><\/noindex>) orsakar avbrott i tj\u00e4nsten. Trots att TightVNC-utvecklarna informerades om problemen redan f\u00f6rra \u00e5ret, f\u00f6rblir s\u00e5rbarheterna o\u00e5tg\u00e4rdade.<\/a><\/noindex> I det plattforms\u00f6vergripande paketet<\/p>\n

TurboVNC (en fork av TightVNC 1.3 som anv\u00e4nder biblioteket libjpeg-turbo), har endast en s\u00e5rbarhet (<\/a><\/noindex> CVE-2019-15683), men den \u00e4r farlig och ger m\u00f6jlighet att utf\u00f6ra egen kod om det finns autentiserad \u00e5tkomst till servern, eftersom adressen f\u00f6r \u00e5terg\u00e5ng kan kontrolleras vid buffert\u00f6verskridning. Problemet \u00e5tg\u00e4rdades<\/a><\/noindex>den 23 augusti och f\u00f6rekommer inte i den aktuella versionen<\/a><\/noindex> Pavel T\u0161eremushkin fr\u00e5n Kaspersky Lab analyserade olika implementationer av systemet. 2.2.3<\/a><\/noindex>.<\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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