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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
MIYAGAWA Plack::Middleware::Session
Default version status: unaffected
0.01 to < 0.35affected
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 ↗
- http://www.openwall.com/lists/oss-security/2025/07/16/4 ↗