CVE-2021-42216

Vulnerability

CVE-2021-42216 is a broken or risky cryptographic algorithm vulnerability in AnonAddy version 0.8.5, specifically in the VerificationController.php file [1][2]. The affected code path is within the email verification mechanism, where the cryptographic implementation is flawed, potentially allowing the generation of valid verification tokens without proper signing [2].

Exploitation

An attacker can exploit this vulnerability by crafting or bypassing the verification tokens due to the weak cryptographic algorithm [2]. No authentication is required, as the attack targets the verification process itself. The exact sequence involves intercepting or forging a verification request to the vulnerable endpoint [3].

Impact

Successful exploitation enables an attacker to bypass the email verification step for new accounts [1]. This could lead to unauthorized creation of accounts without a valid email address, potentially facilitating spam or phishing campaigns using the AnonAddy service [3].

Mitigation

No fixed version has been disclosed in the available references [1][2]. Users are advised to monitor the vendor's official repository for updates and to consider applying security patches if they become available [1]. As of the publication date, no workaround has been provided.