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Rex-1.16.1
⭐ Starred 717 / Rex::Commands::MD5
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::Commands::MD5 - Calculate MD5 sum of files

DESCRIPTION

With this module you calculate the md5 sum of a file.

This is just a helper function and will not be reported.

SYNOPSIS

use Rex::Commands::MD5;
my $md5 = md5($file);

EXPORTED FUNCTIONS

md5($file)

This function will return the MD5 checksum (hexadecimal) for the given file.

task "checksum", "server01", sub {
  say md5("/etc/passwd");
};