CVE-2021-33563

Vulnerability

Koel versions before 5.1.4 lack login throttling, do not enforce a password strength policy, and disclose whether a failed login attempt had a valid username. These issues collectively weaken authentication security. [1][2]

Exploitation

An attacker can perform brute-force attacks without rate limiting, using username enumeration to identify valid accounts and then focusing on weak passwords due to lack of strength policy. No authentication or special privileges are required beyond network access to the login endpoint. [1]

Impact

Successful brute-force would allow unauthorized access to the Koel music streaming application, potentially leading to data exposure or account takeover. [1]

Mitigation

Upgrade to Koel 5.1.4 or later, which addresses these issues. The fix was released on or before May 24, 2021. [2]