Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely

Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predictable session ids could allow an attacker to gain access to systems. Plack::Middleware::Session::Simple is intended to be compatible with Plack::Middleware::Session, which had a similar security issue CVE-2025-40923.

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可预测问题

Plack::Middleware::Session::Simple 安全漏洞

Plack::Middleware::Session::Simple是Masahiro Nagano个人开发者的一个轻量级的会话管理中间件。 Plack::Middleware::Session::Simple 0.04及之前版本存在安全漏洞，该漏洞源于使用不安全的随机数生成器生成会话ID，可能导致会话ID被预测。

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