{"id":28,"date":"2014-04-11T13:20:16","date_gmt":"2014-04-11T08:20:16","guid":{"rendered":"http:\/\/www.chmosama.com\/blog\/?p=28"},"modified":"2017-12-24T15:17:03","modified_gmt":"2017-12-24T10:17:03","slug":"weak-ciphers-found-in-khan-academy","status":"publish","type":"post","link":"https:\/\/www.chmosama.com\/blog\/weak-ciphers-found-in-khan-academy\/","title":{"rendered":"Weak Ciphers Found in Khan Academy"},"content":{"rendered":"<p style=\"text-align: justify;\">Ch. Muhammad Osama, an independent vulnerability researcher has discovered a Weak Ciphers\u00a0Vulnerability\u00a0in Khan Academy\u00a0website www.khanacademy.com, which can be exploited by an attacker to decrypt SSL traffic between web server and site visitors.<\/p>\n<p style=\"text-align: justify;\"><strong>Weak Ciphers\u00a0:-<\/strong><\/p>\n<p style=\"text-align: justify;\">Sensitive data must be protected when it is transmitted through the network. Such data can include user credentials and credit cards. As a rule of thumb, if data must be protected when it is stored, it must be protected also during transmission.<\/p>\n<p style=\"text-align: justify;\">HTTP is a clear-text protocol and it is normally secured via an SSL\/TLS tunnel, resulting in HTTPS traffic [1]. The use of this protocol ensures not only confidentiality, but also authentication. Servers are authenticated using digital certificates and it is also possible to use client certificate for mutual authentication.<\/p>\n<p style=\"text-align: justify;\">Even if high grade ciphers are today supported and normally used, some misconfiguration in the server can be used to force the use of a weak cipher &#8211; or at worst no encryption &#8211; permitting to an attacker to gain access to the supposed secure communication channel. Other misconfiguration can be used for a Denial of Service attack.<\/p>\n<p style=\"text-align: justify;\"><strong>Proof of Concept :-<\/strong><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-29\" src=\"http:\/\/www.chmosama.com\/blog\/wp-content\/uploads\/2017\/08\/khanacademy-poc-1024x528.png\" alt=\"khanacademy-poc\" width=\"525\" height=\"271\" srcset=\"https:\/\/www.chmosama.com\/blog\/wp-content\/uploads\/2017\/08\/khanacademy-poc-1024x528.png 1024w, https:\/\/www.chmosama.com\/blog\/wp-content\/uploads\/2017\/08\/khanacademy-poc-300x155.png 300w, https:\/\/www.chmosama.com\/blog\/wp-content\/uploads\/2017\/08\/khanacademy-poc-768x396.png 768w, https:\/\/www.chmosama.com\/blog\/wp-content\/uploads\/2017\/08\/khanacademy-poc.png 1365w\" sizes=\"auto, (max-width: 525px) 100vw, 525px\" \/><\/p>\n<p><strong>Conclusion :-<\/strong><\/p>\n<p style=\"text-align: justify;\">This vulnerability has been confirmed and patched by Khan Academy\u00a0Security Team. I would like to thank them for their quick response to my report.<\/p>\n<p style=\"text-align: center;\"><strong>Status : Fixed!<\/strong><br \/>\n<strong>Hall of Fame : Yes!<br \/>\nKhan Academy Hacker Badge : Yes!<\/strong><br \/>\n<strong>Bounty: No!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ch. Muhammad Osama, an independent vulnerability researcher has discovered a Weak Ciphers\u00a0Vulnerability\u00a0in Khan Academy\u00a0website www.khanacademy.com, which can be exploited by an attacker to decrypt SSL traffic between web server and site visitors. Weak Ciphers\u00a0:- Sensitive data must be protected when it is transmitted through the network. Such data can include [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":30,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[14,6,8,13],"class_list":["post-28","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-poc","tag-khan-academy","tag-poc","tag-vulnerability","tag-weak-ciphers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Weak Ciphers Found in Khan Academy - Blog - Choudhary Muhammad Osama<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.chmosama.com\/blog\/weak-ciphers-found-in-khan-academy\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Weak Ciphers Found in Khan Academy - Blog - Choudhary Muhammad Osama\" \/>\n<meta property=\"og:description\" content=\"Ch. Muhammad Osama, an independent vulnerability researcher has discovered a Weak Ciphers\u00a0Vulnerability\u00a0in Khan Academy\u00a0website www.khanacademy.com, which can be exploited by an attacker to decrypt SSL traffic between web server and site visitors. Weak Ciphers\u00a0:- Sensitive data must be protected when it is transmitted through the network. 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