======================================================================== CVE-2025-40923 CPAN Security Group ========================================================================
CVE ID: CVE-2025-40923 Distribution: Plack-Middleware-Session Versions: from 0.01 before 0.35 MetaCPAN: https://metacpan.org/dist/Plack-Middleware-Session VCS Repo: https://github.com/plack/Plack-Middleware-Session Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely 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. Problem types ------------- - CWE-340 Generation of Predictable Numbers or Identifiers - CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator Workarounds ----------- Users who are unable to upgrade are advised to change the sid_generator attribute of Plack::Session::State to a function that returns a securely generated session id based on a secure source of entropy from the system. Solutions --------- Users are advised to upgrade to Plack-Middleware-Session v0.35 or later. References ---------- https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22 https://github.com/plack/Plack-Middleware-Session/pull/52 https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch https://security.metacpan.org/docs/guides/random-data-for-security.html
