{"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\/nl\/blog\/news\/uyazvimost-v-zashhishhyonnom-brauzere-bitdefender-safepay-privodyashhaya-k-vypolneniyu-koda","title":{"rendered":"Kwetsbaarheid in de beveiligde browser Bitdefender SafePay die kan leiden tot code-uitvoering","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Vladimir Palant, de maker van Adblock Plus, heeft ontdekt<\/a><\/noindex> kwetsbaarheid<\/a><\/noindex> (CVE-2020-8102<\/a><\/noindex>) in de op Chromium gebaseerde gespecialiseerde webbrowser Safepay, aangeboden als onderdeel van het antiviruspakket Bitdefender Total Security 2020 en gericht op het verhogen van de beveiliging van de gebruiker op internet (bijvoorbeeld biedt het extra isolatie bij het benaderen van banken en betalingssystemen). De kwetsbaarheid stelt websites die in de browser worden geopend in staat om willekeurige code op systeemniveau uit te voeren.<\/p>\n

De oorzaak van het probleem is dat het antivirus Bitdefender het lokale HTTPS-verkeer onderschept door het originele TLS-certificaat van de site te vervangen. Op het systeem van de klant wordt een extra rootcertificaat ge\u00efnstalleerd, dat het functioneren van het toegepaste systeem voor verkeersinspectie verbergt. Het antivirus mengt zich in het beveiligde verkeer en voegt op sommige pagina's zijn eigen JavaScript-code toe om de functie Safe Search te implementeren, en in geval van problemen met het certificaat van de beveiligde verbinding vervangt het de weergegeven foutpagina door een eigen versie. Aangezien de nieuwe foutpagina wordt weergegeven namens de geopende server, hebben andere pagina's van deze server volledige toegang tot de inhoud die door Bitdefender is ingevoegd.<\/p>\n

Wanneer een door de aanvaller gecontroleerde website wordt geopend, kan deze een XMLHttpRequest-verzoek verzenden en bij de reactie een probleem met het HTTPS-certificaat simuleren, wat leidt tot het retourneren van een pagina met een fout, vervalst door Bitdefender. Aangezien de foutpagina is geopend in de context van het domein van de aanvaller, kan hij de inhoud van de vervalste pagina met de parameters van Bitdefender lezen. Op de vervalste pagina van Bitdefender staat onder andere een sessiesleutel die via de interne API van Bitdefender kan worden gebruikt om een aparte Safepay-browser sessie te starten, terwijl willekeurige commandoregelvlaggen worden opgegeven, en dit maakt het mogelijk om elk systeemcommando uit te voeren met de vlag \u2018--utility-cmd-prefix\u2019. Voorbeeld van de exploit (param1 en param2 zijn waarden verkregen van de foutpagina):<\/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

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

Ter herinnering, het onderzoek dat in 2017 is uitgevoerd toonden aan<\/a><\/noindex>, waaruit bleek dat 24 van de 26 geteste antivirusproducten, die HTTPS-verkeer inspecteren door certificaten te vervangen, het algehele beveiligingsniveau van HTTPS-verbindingen verlaagden.
\nActuele cipher-sets werden alleen in 11 van de 26 producten aangeboden. 5 systemen verifieerden geen certificaten (Kaspersky Internet Security 16 Mac, NOD32 AV 9, CYBERsitter, Net Nanny 7 Win, Net Nanny 7 Mac). De producten Kaspersky Internet Security en Total Security waren kwetsbaar voor aanvallen CRIME<\/a><\/noindex>, terwijl de producten AVG, Bitdefender en Bullguard ook blootgesteld waren aan aanvallen Logjam<\/a><\/noindex> en POODLE<\/a><\/noindex>. Het product Dr.Web Antivirus 11 laat gebruikers terugschakelen naar onbetrouwbare exportciphers (aanval FREAK<\/a><\/noindex>).<\/p>\n

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

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

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