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Rex-1.16.1
⭐ Starred 717 / Rex::Group::Lookup::YAML
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::Group::Lookup::YAML - read hostnames and groups from a YAML file

DESCRIPTION

With this module you can define hostgroups out of an yaml file.

SYNOPSIS

use Rex::Group::Lookup::YAML;
groups_yaml "file.yml";

EXPORTED FUNCTIONS

groups_yaml($file, create_all_group => $boolean )

With this function you can read groups from yaml files. The optional create_all_group option can be passed. If it is set to true, the group all, including all hosts, will also be created.

# in my_groups.yml
webserver:
 - fe01
 - fe02
 - f03
backends:
 - be01
 - be02
 - f03

# in Rexfile

groups_yaml('my_groups.yml');

# or
groups_yaml('my_groups.yml', create_all_group => TRUE);