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Dancer2-0.203001
⭐ Starred 552 / Dancer2::Session::YAML
Security Advisories (2)
CPANSA-Dancer2-2018-01 (2018-01-30)

There is a potential RCE with regards to Storable. We have added session ID validation to the session engine so that session backends based on Storable can reject malformed session IDs that may lead to exploitation of the RCE.

CVE-2026-13577 (2026-07-20)

Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable. Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available. The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function). These are all low-entropy and easily guessed sources. The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.

NAME

Dancer2::Session::YAML - YAML-file-based session backend for Dancer2

VERSION

version 0.203001

DESCRIPTION

This module implements a session engine based on YAML files. Session are stored in a session_dir as YAML files. The idea behind this module was to provide a human-readable session storage for the developer.

This backend is intended to be used in development environments, when digging inside a session can be useful.

This backend can perfectly be used in production environments, but two things should be kept in mind: The content of the session files is in plain text, and the session files should be purged by a CRON job.

CONFIGURATION

The setting session should be set to YAML in order to use this session engine in a Dancer2 application.

Files will be stored to the value of the setting session_dir, whose default value is appdir/sessions.

Here is an example configuration that use this session engine and stores session files in /tmp/dancer-sessions

session: "YAML"

engines:
  session:
    YAML:
      session_dir: "/tmp/dancer-sessions"
      cookie_duration: 3600    # Default cookie timeout in seconds

DEPENDENCY

This module depends on YAML.

SEE ALSO

See Dancer2::Core::Session for details about session usage in route handlers.

AUTHOR

Dancer Core Developers

COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.