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Online music platform SoundCloud, which can be thought of as an audio-based YouTube for music creators, has addressed several security bugs in its APIs that could lead to denial-of-service (DoS) or account takeover via credential-stuffing. SoundCloud recently sold a $75 million stake to satellite radio giant SiriusXM and the two also inked a lucrative ad deal. SoundCloud claims to host 200 million different music tracks on its online platform. According to researcher Paulo Silva of Checkmarx Security Research, three different groups of security vulnerabilities were found in the platform: A authentication issue which could lead to account takeover; a rate-limiting bug that could lead to DoS; and an improper input validation. The broken authentication issue has to do with not having a set number of login tries before locking someone out of the account – which opens the door to unlimited brute-force attacks from cybercriminals trying to guess passwords. “The /sign-in/password endpoint of api-v2.soundcloud.com does not implement proper account lockout based on failed authentication attempts,” according to Silva, in an analysis posted Tuesday. “It solely relies on rate limiting which can be evaded using several combinations of use_agent, device_id and signature.” That means that credential stuffing — the automated process of verifying that breached pairs of usernames and passwords work for not only the services that they originated from, but also other services — could have…

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