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Rex-1.16.1
⭐ Starred 717 / Rex::Logger
Security Advisories (1)
CVE-2026-94140 (2026-10-21)

Rex versions through 1.16.1 for Perl accept an unknown SSH host key for remote rsync transfers because sync hardcodes StrictHostKeyChecking=no. Every remote branch of sync builds its ssh command with that option, for password authentication, for private-key authentication and for the fallback. The ssh options a caller sets through set_openssh_opt reach the OpenSSH transport but not this command, so there is no configuration that restores host key checking for the transfer. An attacker who can redirect the connection before the real host key is known presents their own and the transfer proceeds: under password authentication sync sends the connection password to that server, an upload writes the selected local files to it, and a download writes what it returns to the local destination.

NAME

Rex::Logger - Logging Module

DESCRIPTION

This module is the logging module. You can define custom logformats.

SYNOPSIS

$Rex::Logger::format = '[%D] %s';
# will output something like
# [2012-04-12 18:35:12] Installing package vim

$Rex::Logger::format = '%h - %D - %s';
# will output something like
# srv001 - 2012-04-12 18:35:12 - Installing package vim

VARIABLES

$debug

Setting this variable to 1 will enable debug logging.

$Rex::Logger::debug = 1;
$silent

If you set this variable to 1 nothing will be logged.

$Rex::Logger::silent = 1;
$format

You can define the logging format with the following parameters.

%D - Appends the current date yyyy-mm-dd HH:mm:ss

%h - The target host

%p - The pid of the running process

%l - Loglevel (INFO or DEBUG)

%s - The Logstring

Default is: [%D] %l - %s