{"id":86356,"date":"2020-06-24T13:42:00","date_gmt":"2020-06-24T11:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-zashhishhyonnom-brauzere-bitdefender-safepay-privodyashhaya-k-vypolneniyu-koda"},"modified":"2020-06-24T13:42:00","modified_gmt":"2020-06-24T11:42:00","slug":"uyazvimost-v-zashhishhyonnom-brauzere-bitdefender-safepay-privodyashhaya-k-vypolneniyu-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-zashhishhyonnom-brauzere-bitdefender-safepay-privodyashhaya-k-vypolneniyu-koda","title":{"rendered":"Vulnerabilitate \u00een browserul protejat Bitdefender SafePay, care duce la executarea de cod","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Vladimir Palant, creator of Adblock Plus, a identificat<\/a><\/noindex> vulnerabilitatea<\/a><\/noindex> (CVE-2020-8102<\/a><\/noindex>) \u00een browserul web specializat Safepay, bazat pe motorul Chromium, oferit ca parte a pachetului antivirus Bitdefender Total Security 2020, destinat s\u0103 \u00eembun\u0103t\u0103\u021beasc\u0103 securitatea utilizatorilor \u00een internet (de exemplu, oferind o izolare suplimentar\u0103 atunci c\u00e2nd se acceseaz\u0103 b\u0103nci \u0219i sisteme de pl\u0103\u021bi). Vulnerabilitatea permite site-urilor deschise \u00een browser s\u0103 execute cod arbitrar la nivelul sistemului de operare.<\/p>\n

Problema const\u0103 \u00een faptul c\u0103 antivirusul Bitdefender efectueaz\u0103 interceptarea local\u0103 a traficului HTTPS prin substituirea certificatului TLS original al site-ului. Pe sistemul clientului se instaleaz\u0103 un certificat r\u0103d\u0103cin\u0103 suplimentar, care permite ascunderea func\u021bion\u0103rii sistemului de inspectare a traficului utilizat. Antivirusul se intercaleaz\u0103 \u00een traficul securizat \u0219i introduce \u00een unele pagini propriul cod JavaScript pentru a implementa func\u021bia Safe Search, iar \u00een cazul problemelor cu certificatul conexiunii securizate, \u00eenlocuie\u0219te pagina de eroare emitent\u0103 cu una proprie. Deoarece noua pagin\u0103 de eroare este emis\u0103 \u00een numele serverului accesat, celelalte pagini ale acelui server au acces complet la con\u021binutul inserat de Bitdefender.<\/p>\n

C\u00e2nd se deschide un site controlat de atacator, acesta poate trimite o solicitare XMLHttpRequest \u0219i poate simula o problem\u0103 cu certificatul HTTPS, ceea ce va duce la returnarea unei pagini cu o eroare, substituit\u0103 de Bitdefender. Deoarece pagina cu eroarea este deschis\u0103 \u00een contextul domeniului atacatorului, acesta poate citi con\u021binutul paginii substituite cu parametrii Bitdefender. Pe pagina substituit\u0103 de Bitdefender se afl\u0103 inclusiv o cheie de sesiune, care permite prin intermediul API-ului intern Bitdefender s\u0103 porneasc\u0103 o sesiune separat\u0103 a browserului Safepay, specific\u00e2nd astfel orice flag-uri de linie de comand\u0103 \u0219i reu\u0219ind s\u0103 ruleze orice comenzi sistem prin flag-ul \u201c--utility-cmd-prefix\u201d. Exemplul de exploit (param1 \u0219i param2 - valori ob\u021binute de pe pagina cu eroare):<\/p>\n

var request = new XMLHttpRequest();
\n request.open('POST', Math.random());
\n request.setRequestHeader('Content-type', 'application\/x-www-form-urlencoded');
\n request.setRequestHeader('BDNDSS_B67EA559F21B487F861FDA8A44F01C50', param1);
\n request.setRequestHeader('BDNDCA_BBACF84D61A04F9AA66019A14B035478', param2);
\n request.setRequestHeader('BDNDWB_5056E556833D49C1AF4085CB254FC242', 'obk.run');
\n request.setRequestHeader('BDNDOK_4E961A95B7B44CBCA1907D3D3643370D', location.href);
\n request.send('data:text\/html,nada --utility-cmd-prefix=\\cmd.exe \/k whoami & echo\\'>);<\/p>\n

\"Vulnerabilitate<\/a><\/noindex><\/center><\/p>\n

Amintim c\u0103 studiul realizat \u00een 2017 a ar\u0103tat<\/a><\/noindex>, ar\u0103ta c\u0103 24 din 26 de produse antivirus testate, care inspecteaz\u0103 traficul HTTPS prin substituirea certificatelor, reduceau nivelul general de securitate al conexiunii HTTPS.
\nSeturile de cifruri actuale erau furnizate doar \u00een 11 din 26 de produse. 5 sisteme nu efectuau verificarea certificatelor (Kaspersky Internet Security 16 Mac, NOD32 AV 9, CYBERsitter, Net Nanny 7 Win, Net Nanny 7 Mac). Produsele Kaspersky Internet Security \u0219i Total Security au fost vulnerabile la atacuri CRIME<\/a><\/noindex>, iar produsele AVG, Bitdefender \u0219i Bullguard la atacuri Logjam<\/a><\/noindex> \u0219i POODLE<\/a><\/noindex>. Produsul Dr.Web Antivirus 11 permite revenirea la cifruri de export nesigure (atac FREAK<\/a><\/noindex>).<\/p>\n

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

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

\u0412\u043b\u0430\u0434\u0438\u043c\u0438\u0440 \u041f\u0430\u043b\u0430\u043d\u0442, \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c Adblock Plus, \u0432\u044b\u044f\u0432\u0438\u043b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-8102) \u0432 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043d\u0430 \u0434\u0432\u0438\u0436\u043a\u0435 Chromium \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0435 Safepay, \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u0430\u043d\u0442\u0438\u0432\u0438\u0440\u0443\u0441\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 Bitdefender Total Security 2020 \u0438 \u043d\u0430\u0446\u0435\u043b\u0435\u043d\u043d\u043e\u043c \u043d\u0430 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 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