NervesHub has Insufficient Token Entropy that Allows Authentication Bypass via Brute Force

NervesHub is a web service that allows users to manage over-the-air (OTA) firmware updates of devices in the field. A vulnerability present starting in version 1.0.0 and prior to version 2.3.0 allowed attackers to brute-force user API tokens due to the predictable format of previously issued tokens. Tokens included user-identifiable components and were not cryptographically secure, making them susceptible to guessing or enumeration. The vulnerability could have allowed unauthorized access to user accounts or API actions protected by these tokens. A fix is available in version 2.3.0 of NervesHub. This version introduces strong, cryptographically-random tokens using `:crypto.strong_rand_bytes/1`, hashing of tokens before database storage to prevent misuse even if the database is compromised, and context-aware token storage to distinguish between session and API tokens. There are no practical workarounds for this issue other than upgrading. In sensitive environments, as a temporary mitigation, firewalling access to the NervesHub server can help limit exposure until an upgrade is possible.

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使用不充分的随机数

NervesHub 安全特征问题漏洞

NervesHub是NervesHub开源的一个管理Nerves设备的固件更新的软件。 NervesHub 1.0.0版本至2.3.0之前版本存在安全特征问题漏洞，该漏洞源于令牌格式可预测且非加密安全，可能导致暴力破解用户API令牌，造成未授权访问。

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