Plack::Middleware::Session::Cookie 0.21 has a security vulnerability where it allows an attacker to execute arbitrary code on the server, when the middleware is enabled without a secret.

• https://gist.github.com/miyagawa/2b8764af908a0dacd43d
• https://metacpan.org/changes/distribution/Plack-Middleware-Session

Plack-Middleware-Session before version 0.35 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. Predicable session ids could allow an attacker to gain access to systems.

• https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch
• https://github.com/plack/Plack-Middleware-Session/pull/52
• https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22
• https://security.metacpan.org/docs/guides/random-data-for-security.html