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
Product status
0.01 (custom) before 0.35
References
www.openwall.com/lists/oss-security/2025/07/16/4
metacpan.org/...ssion-0.34/source/lib/Plack/Session/State.pm
github.com/plack/Plack-Middleware-Session/pull/52
github.com/...1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch
security.metacpan.org/...uides/random-data-for-security.html