Bug 2381699 (CVE-2025-40924)

Summary: CVE-2025-40924 catalyst-plugin-session: Catalyst::Plugin::Session generates session ids insecurely
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A session id generation flaw has been discovered in the Catalyst::Plugin::Session Perl module. The session id is generated from a hash (usually SHA-1) of a simple counter, the epoch time, the built-in rand function, the PID, and the current Catalyst context. This information is of low entropy. 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. Predicable session ids could allow an attacker to gain access to systems.
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Bug Depends On: 2381743, 2381744    
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Description OSIDB Bzimport 2025-07-17 14:01:17 UTC 
Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely.

The session id is generated from a (usually SHA-1) hash of a simple counter, the epoch time, the built-in rand function, the PID and the current Catalyst context. This information is of low entropy. 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.