/ 
Dancer-1.3522
⭐ Starred 738 / Dancer::Logger::Abstract
Security Advisories (1)
CVE-2026-5080 (2026-04-30)

Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely. The session id is generated from summing the character codepoints of the absolute pathname with the process id, the epoch time and calls to the built-in rand() function to return a number between 0 and 999-billion, and concatenating that result three times. The path name might be known or guessed by an attacker, especially for applications known to be written using Dancer with standard installation locations. The epoch time can be guessed by an attacker, and may be leaked in the HTTP header. The process id comes from a small set of numbers, and workers may have sequential process ids. The built-in rand() function is seeded with 32-bits and is considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.

NAME

Dancer::Logger::Abstract - Abstract logging engine for Dancer

VERSION

version 1.3522

SYNOPSIS

In your configuration file:

# default
logger_format: simple
# [1234] debug @0.12> [hit #123]message from your log in File.pm line 12

# custom
logger_format: %m %{%H:%M}t [%{accept_type}h]
# message from your log [11:59] [text/html]

DESCRIPTION

This is an abstract logging engine that provides loggers with basic functionality and some sanity checking.

CONFIGURATION

logger_format

This is a format string (or a preset name) to specify the log format.

The possible values are:

%h

host emitting the request

%t

date (local timezone, formatted like %d/%b/%Y %H:%M:%S)

%T

date (local timezone, formatted like %Y-%m-%d %H:%M:%S)

%u

date (UTC timezone, formatted like %d/%b/%Y %H:%M:%S)

%U

date (UTC timezone, formatted like %Y-%m-%d %H:%M:%S)

%P

PID

%L

log level

%D

timer

%m

message

%f

file name that emit the message

%l

line from the file

%i

request ID

%{$fmt}t

timer formatted with a valid time format

%{header}h

header value

There is currently a single preset log format:

simple

will format the message like: [%P] %L @%D> %i%m in %f l. %l

METHODS

format_message

Provides a common message formatting.

core

Logs messages as core.

debug

Logs messages as debug.

warning

Logs messages as warning.

error

Logs messages as error.

info

Logs messages as info.

_log

A method to override. If your logger does not provide this, it will cause the application to die.

_should

Checks a certain level number against a certain level type (core, debug, info warning, error).

AUTHOR

Dancer Core Developers

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 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.