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How I Could Steal Money from Instagram, Google and Microsoft

TL;DR: Instagram ($2000), Google ($0) and Microsoft ($500) were vulnerable to direct money theft via premium phone number calls. They all offer services to supply users with a token via a computer-voiced phone call, but neglected to properly verify whether supplied phone numbers were legitimate, non-premium numbers. This could have allowed a dedicated attacker to steal thousands of EUR/USD/GBP/… . Microsoft was exceptionally vulnerable to mass exploitation by supporting virtually unlimited concurrent calls to one premium number. The vulnerabilities were submitted to the respective Bug Bounty programs and properly resolved.

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InstaBrute: Two Ways to Brute-force Instagram Account Credentials

TL;DR: Instagram contained two distinct vulnerabilities that allowed an attacker to brute-force passwords of user accounts. Combined with user enumeration, a weak password policy, no 2FA nor other mitigating security controls, this could have allowed an attacker to compromise many accounts without any user interaction, including high-profile ones. Facebook fixed both issues and awarded a combined bounty of $5.000. Continue Reading