CVE-2025-40923 Information

Jul 17, 2025 cve

Description

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.

Reference

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

CNNVD-202507-2089 (Published: 2025-07-16)

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