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Rex-1.16.1
⭐ Starred 717 / Rex::Commands::Process
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::Process - Process management commands

DESCRIPTION

With this module you can manage processes. List, Kill, and so on.

Version <= 1.0: All these functions will not be reported.

All these functions are not idempotent.

SYNOPSIS

kill $pid;
killall "apache2";
nice($pid, $level);

EXPORTED FUNCTIONS

kill($pid, $sig)

Will kill the given process id. If $sig is specified it will kill with the given signal.

task "kill", "server01", sub {
  kill 9931;
  kill 9931, -9;
};

killall($name, $sig)

Will kill the given process. If $sig is specified it will kill with the given signal.

task "kill-apaches", "server01", sub {
  killall "apache2";
  killall "apache2", -9;
};

ps

List all processes on a system. Will return all fields of a ps aux.

task "ps", "server01", sub {
  for my $process (ps()) {
   say "command  > " . $process->{"command"};
   say "pid    > " . $process->{"pid"};
   say "cpu-usage> " . $process->{"cpu"};
  }
};

On most operating systems it is also possible to define custom parameters for ps() function.

task "ps", "server01", sub {
  my @list = grep { $_->{"ni"} == -5 } ps("command","ni");
};

This example would contain all processes with a nice of -5.

nice($pid, $level)

Renice a process identified by $pid with the priority $level.

task "renice", "server01", sub {
  nice (153, -5);
};