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Amon2-Plugin-Web-CSRFDefender-7.03
⭐ Starred 1 / Amon2::Plugin::Web::CSRFDefender
Security Advisories (1)
CVE-2026-5082 (2026-04-08)

Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id. The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. 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. Amon2::Plugin::Web::CSRFDefender versions before 7.00 were part of Amon2, which was vulnerable to insecure session ids due to CVE-2025-15604. Note that the author has deprecated this module.

NAME

Amon2::Plugin::Web::CSRFDefender - Anti CSRF filter

SYNOPSIS

package MyApp::Web;
use Amon2::Web;

__PACKAGE__->load_plugin('Web::CSRFDefender');

DESCRIPTION

This plugin denies CSRF request.

Do not use this with HTTP::Session2. Because HTTP::Session2 has XSRF token management function by itself.

METHODS

$c->get_csrf_defender_token()

Get a CSRF defender token. This method is useful to add token for AJAX request.

$c->validate_csrf()

You can validate CSRF token manually.

PARAMETERS

no_validate_hook

Do not run validation automatically.

no_html_filter

Disable HTML rewriting filter. By default, CSRFDefender inserts XSRF token for each form element.

It's very useful but it hits performance issue if your site is very high traffic.

csrf_token_generator

You can change the csrf token generation algorithm.

LICENSE

Copyright (C) Tokuhiro Matsuno.

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

AUTHOR

Tokuhiro Matsuno <tokuhirom@gmail.com>

THANKS TO

Kazuho Oku and mala for security advice.

SEE ALSO

Amon2