CVE-2025-40923 (GCVE-0-2025-40923)
Vulnerability from cvelistv5
Published
2025-07-16 13:05
Modified
2025-07-16 20:48
Severity ?
7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE
  • CWE-340 - Generation of Predictable Numbers or Identifiers
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator
Summary
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.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/plack/Plack-Middleware-Session/pull/52
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://security.metacpan.org/docs/guides/random-data-for-security.html
Impacted products
Vendor Product Version
MIYAGAWA Plack::Middleware::Session Version: 0.01   < 0.35
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