CVE-2025-40923
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
16/07/2025
Last modified:
04/11/2025
Description
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely.<br />
<br />
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.<br />
<br />
Predicable session ids could allow an attacker to gain access to systems.
Impact
Base Score 3.x
7.30
Severity 3.x
HIGH
References to Advisories, Solutions, and Tools
- 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
- http://www.openwall.com/lists/oss-security/2025/07/16/4