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Date: Mon, 28 Apr 2014 11:17:31 +0200 From: jdiaz@...t.inteco.es To: fulldisclosure@...lists.org Subject: [FD] Telegram authentication bypass Hello, A security issue affecting Telegram instant messaging service has been made public by INTECO-CERT. Further details follow. ---------------------------------- Affected products and services: ---------------------------------- Telegram instant messaging service. ---------------------------------- Overview: ---------------------------------- Telegram authentication mechanism may be circumvented, since there is no way to verify the legitimacy of Telegrams public keys and thus if the client is communicating with a legitimate server. This may allow an attacker leveraging this issue (e.g. by distributing a slightly modified client) to obtain almost full control of the victim's account. Further, the behavior of the victims client is exactly the same than the behavior of a legitimate client. For a detailed analysis, including a PoC, visit: http://www.inteco.es/blogs/post/Seguridad/BlogSeguridad/Articulo_y_comentarios/telegram_authentication (blog post with extended abstract) or http://cert.inteco.es/extfrontinteco/img/File/intecocert/EstudiosInformes/INT_Telegram_EN.pdf (detailed research results). ---------------------------------- Timeline: ---------------------------------- 2014.03.07 - Initial contact with Telegram security team. 2014.03.10 - Telegram response informing that this issue is out of their security model. 2014.03.11 - Submission of PoC to Telegram security team. 2014.04.28 - Publication of research results. Sincerely, Jesus Diaz _______________________________________________ Sent through the Full Disclosure mailing list http://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
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