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The following advisory describes a unauthenticated deserialization vulnerability that leads to arbitrary delete files and, under certain circumstances, code execution found in vBulletin version 5.
vBulletin, also known as vB, is “a widespread proprietary Internet forum software package developed by vBulletin Solutions, Inc., based on PHP and MySQL database server. vBulletin powers many of the largest social sites on the web, with over 100,000 sites built on it, including Fortune 500 and Alexa Top 1M companies websites and forums. According to the latest W3Techs1 statistics, vBulletin version 4 holds more than 55% of the vBulletin market share, while version 3 and 5 divide the remaining percentage”.
A security researcher from, TRUEL IT ( @truel_it ), has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program.
We tried to contact vBulletin since November 21 2017, repeated attempts to establish contact went unanswered. At this time there is no solution or workaround for these vulnerabilities.